CO4 postcode district: Colchester and around, Essex

CO4 is a postcode district in Essex, with 1,193 postcodes in use in 6 sectors. It has postcodes in Colchester. It is split between 2 councils: Colchester (1,176 postcodes) and Tendring (17).

Postcodes in use
1,193
Sectors
6
Councils
2 councils
Places
Colchester

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in CO4, by flood risk

Map of every postcode in CO4, by flood risk Of the 1,193 postcodes in CO4 that ONS places, 11 have a home or business at high risk, 1 are at medium risk at worst, 6 are at low risk at worst, 9 are at very low risk only and 1,166 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 5 postcodes at high or medium risk. Places named: Colchester, West Bergholt, Great Horkesley. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A134A137A1124A120 CO4 0AA: not on the flood risk listCO4 0AD: not on the flood risk listCO4 0AE: not on the flood risk listCO4 0AF: not on the flood risk listCO4 0AG: not on the flood risk listCO4 0AH: not on the flood risk listCO4 0AJ: not on the flood risk listCO4 0AL: not on the flood risk listCO4 0AN: not on the flood risk listCO4 0AP: not on the flood risk listCO4 0AQ: not on the flood risk listCO4 0AR: not on the flood risk listCO4 0AS: not on the flood risk listCO4 0AT: not on the flood risk listCO4 0AX: not on the flood risk listCO4 0AY: not on the flood risk listCO4 0BA: not on the flood risk listCO4 0BB: not on the flood risk listCO4 0BG: not on the flood risk listCO4 0BH: not on the flood risk listCO4 0BJ: not on the flood risk listCO4 0BL: not on the flood risk listCO4 0BP: not on the flood risk listCO4 0BQ: not on the flood risk listCO4 0BS: not on the flood risk listCO4 0BT: not on the flood risk listCO4 0BU: not on the flood risk listCO4 0BW: not on the flood risk listCO4 0BX: not on the flood risk listCO4 0BY: not on the flood risk listCO4 0BZ: not on the flood risk listCO4 0DA: not on the flood risk listCO4 0DB: not on the flood risk listCO4 0DD: not on the flood risk listCO4 0DE: not on the flood risk listCO4 0DF: not on the flood risk listCO4 0DG: not on the flood risk listCO4 0DH: not on the flood risk listCO4 0DJ: not on the flood risk listCO4 0DL: not on the flood risk listCO4 0DP: not on the flood risk listCO4 0DQ: not on the flood risk listCO4 0DR: not on the flood risk listCO4 0DS: not on the flood risk listCO4 0DU: not on the flood risk listCO4 0DW: not on the flood risk listCO4 0DX: not on the flood risk listCO4 0DY: not on the flood risk listCO4 0DZ: not on the flood risk listCO4 0EL: not on the flood risk listCO4 0EN: not on the flood risk listCO4 0EP: not on the flood risk listCO4 0EQ: not on the flood risk listCO4 0ER: not on the flood risk listCO4 0ES: not on the flood risk listCO4 0ET: not on the flood risk listCO4 0EU: not on the flood risk listCO4 0EW: not on the flood risk listCO4 0EX: not on the flood risk listCO4 0EY: not on the flood risk listCO4 0HG: not on the flood risk listCO4 0HH: not on the flood risk listCO4 0HL: not on the flood risk listCO4 0HN: not on the flood risk listCO4 0HQ: not on the flood risk listCO4 0HU: not on the flood risk listCO4 0HW: not on the flood risk listCO4 0HX: not on the flood risk listCO4 0HY: not on the flood risk listCO4 0HZ: not on the flood risk listCO4 0JA: not on the flood risk listCO4 0JD: not on the flood risk listCO4 0JE: not on the flood risk listCO4 0JF: not on the flood risk listCO4 0JG: not on the flood risk listCO4 0JH: not on the flood risk listCO4 0JJ: not on the flood risk listCO4 0JL: not on the flood risk listCO4 0JN: not on the flood risk listCO4 0JP: not on the flood risk listCO4 0JQ: not on the flood risk listCO4 0JR: not on the flood risk listCO4 0JT: not on the flood risk listCO4 0JW: not on the flood risk listCO4 0JX: not on the flood risk listCO4 0JY: not on the flood risk listCO4 0LA: not on the flood risk listCO4 0LB: not on the flood risk listCO4 0LE: not on the flood risk listCO4 0LF: not on the flood risk listCO4 0LG: not on the flood risk listCO4 0LH: not on the flood risk listCO4 0LL: not on the flood risk listCO4 0LN: not on the flood risk listCO4 0LP: not on the flood risk listCO4 0LQ: not on the flood risk listCO4 0LR: not on the flood risk listCO4 0LS: not on the flood risk listCO4 0LU: not on the flood risk listCO4 0LX: not on the flood risk listCO4 0LZ: not on the flood risk listCO4 0ND: not on the flood risk listCO4 0NE: not on the flood risk listCO4 0NF: not on the flood risk listCO4 0NG: not on the flood risk listCO4 0NH: not on the flood risk listCO4 0NJ: not on the flood risk listCO4 0NL: not on the flood risk listCO4 0NN: not on the flood risk listCO4 0NP: not on the flood risk listCO4 0NR: not on the flood risk listCO4 0NT: not on the flood risk listCO4 0NU: not on the flood risk listCO4 0NW: not on the flood risk listCO4 0NX: not on the flood risk listCO4 0NY: not on the flood risk listCO4 0NZ: not on the flood risk listCO4 0PA: not on the flood risk listCO4 0PG: not on the flood risk listCO4 0PH: not on the flood risk listCO4 0PJ: not on the flood risk listCO4 0PL: not on the flood risk listCO4 0PN: not on the flood risk listCO4 0PP: not on the flood risk listCO4 0PR: not on the flood risk listCO4 0PS: not on the flood risk listCO4 0PT: not on the flood risk listCO4 0PX: not on the flood risk listCO4 0PY: not on the flood risk listCO4 0PZ: not on the flood risk listCO4 0QA: not on the flood risk listCO4 0QD: not on the flood risk listCO4 0QF: not on the flood risk listCO4 0QH: not on the flood risk listCO4 0QJ: not on the flood risk listCO4 0QL: not on the flood risk listCO4 0QN: not on the flood risk listCO4 0QW: not on the flood risk listCO4 0RA: not on the flood risk listCO4 0SA: not on the flood risk listCO4 0XB: not on the flood risk listCO4 0YW: not on the flood risk listCO4 0ZN: not on the flood risk listCO4 3AE: not on the flood risk listCO4 3AG: not on the flood risk listCO4 3AH: not on the flood risk listCO4 3AJ: not on the flood risk listCO4 3AN: not on the flood risk listCO4 3AP: not on the flood risk listCO4 3AQ: not on the flood risk listCO4 3AR: not on the flood risk listCO4 3AS: not on the flood risk listCO4 3AT: not on the flood risk listCO4 3AU: not on the flood risk listCO4 3AW: not on the flood risk listCO4 3AY: not on the flood risk listCO4 3BA: not on the flood risk listCO4 3BE: not on the flood risk listCO4 3BF: not on the flood risk listCO4 3BH: not on the flood risk listCO4 3BN: not on the flood risk listCO4 3BP: not on the flood risk listCO4 3BS: not on the flood risk listCO4 3BU: not on the flood risk listCO4 3BX: not on the flood risk listCO4 3DA: not on the flood risk listCO4 3DB: not on the flood risk listCO4 3DD: not on the flood risk listCO4 3DE: not on the flood risk listCO4 3DF: not on the flood risk listCO4 3DH: not on the flood risk listCO4 3DN: not on the flood risk listCO4 3DQ: not on the flood risk listCO4 3DR: not on the flood risk listCO4 3DS: not on the flood risk listCO4 3DT: not on the flood risk listCO4 3DU: not on the flood risk listCO4 3DW: not on the flood risk listCO4 3DX: not on the flood risk listCO4 3DY: not on the flood risk listCO4 3EA: not on the flood risk listCO4 3EB: not on the flood risk listCO4 3ED: not on the flood risk listCO4 3EG: not on the flood risk listCO4 3EH: not on the flood risk listCO4 3EJ: not on the flood risk listCO4 3EN: not on the flood risk listCO4 3EP: not on the flood risk listCO4 3EQ: not on the flood risk listCO4 3ER: not on the flood risk listCO4 3ES: not on the flood risk listCO4 3EU: not on the flood risk listCO4 3EX: not on the flood risk listCO4 3EY: not on the flood risk listCO4 3EZ: not on the flood risk listCO4 3FA: not on the flood risk listCO4 3FB: not on the flood risk listCO4 3FD: not on the flood risk listCO4 3FE: not on the flood risk listCO4 3FF: not on the flood risk listCO4 3FG: not on the flood risk listCO4 3FH: not on the flood risk listCO4 3FJ: not on the flood risk listCO4 3FL: not on the flood risk listCO4 3FN: not on the flood risk listCO4 3FQ: not on the flood risk listCO4 3FR: not on the flood risk listCO4 3FS: not on the flood risk listCO4 3FU: not on the flood risk listCO4 3FW: not on the flood risk listCO4 3FY: not on the flood risk listCO4 3GA: not on the flood risk listCO4 3GE: not on the flood risk listCO4 3GF: not on the flood risk listCO4 3GH: not on the flood risk listCO4 3GQ: not on the flood risk listCO4 3GS: not on the flood risk listCO4 3GW: not on the flood risk listCO4 3GX: not on the flood risk listCO4 3HA: not on the flood risk listCO4 3HB: not on the flood risk listCO4 3HD: not on the flood risk listCO4 3HF: not on the flood risk listCO4 3HG: not on the flood risk listCO4 3HH: not on the flood risk listCO4 3HL: not on the flood risk listCO4 3HN: not on the flood risk listCO4 3HR: not on the flood risk listCO4 3HU: not on the flood risk listCO4 3HX: not on the flood risk listCO4 3HY: not on the flood risk listCO4 3HZ: not on the flood risk listCO4 3JA: not on the flood risk listCO4 3JB: not on the flood risk listCO4 3JD: not on the flood risk listCO4 3JE: not on the flood risk listCO4 3JF: not on the flood risk listCO4 3JG: not on the flood risk listCO4 3JH: not on the flood risk listCO4 3JJ: not on the flood risk listCO4 3JL: not on the flood risk listCO4 3JN: not on the flood risk listCO4 3JP: not on the flood risk listCO4 3JR: not on the flood risk listCO4 3JS: not on the flood risk listCO4 3JT: not on the flood risk listCO4 3JU: not on the flood risk listCO4 3JW: not on the flood risk listCO4 3JX: not on the flood risk listCO4 3JZ: not on the flood risk listCO4 3LA: not on the flood risk listCO4 3LB: not on the flood risk listCO4 3LD: not on the flood risk listCO4 3LE: not on the flood risk listCO4 3LF: not on the flood risk listCO4 3LG: not on the flood risk listCO4 3LH: not on the flood risk listCO4 3LJ: not on the flood risk listCO4 3LL: not on the flood risk listCO4 3LN: not on the flood risk listCO4 3LP: not on the flood risk listCO4 3LR: not on the flood risk listCO4 3LS: not on the flood risk listCO4 3LU: not on the flood risk listCO4 3LX: not on the flood risk listCO4 3LZ: not on the flood risk listCO4 3NA: not on the flood risk listCO4 3NB: not on the flood risk listCO4 3ND: not on the flood risk listCO4 3NE: not on the flood risk listCO4 3NF: not on the flood risk listCO4 3NH: not on the flood risk listCO4 3NJ: not on the flood risk listCO4 3NN: not on the flood risk listCO4 3NT: not on the flood risk listCO4 3NU: not on the flood risk listCO4 3NW: not on the flood risk listCO4 3NX: not on the flood risk listCO4 3NY: not on the flood risk listCO4 3NZ: not on the flood risk listCO4 3PA: not on the flood risk listCO4 3PB: not on the flood risk listCO4 3PE: not on the flood risk listCO4 3PG: not on the flood risk listCO4 3PL: not on the flood risk listCO4 3PP: not on the flood risk listCO4 3PQ: not on the flood risk listCO4 3PS: not on the flood risk listCO4 3PT: not on the flood risk listCO4 3PU: not on the flood risk listCO4 3PW: not on the flood risk listCO4 3PY: not on the flood risk listCO4 3QA: not on the flood risk listCO4 3QB: not on the flood risk listCO4 3QD: not on the flood risk listCO4 3QE: not on the flood risk listCO4 3QF: not on the flood risk listCO4 3QL: not on the flood risk listCO4 3QN: not on the flood risk listCO4 3QP: not on the flood risk listCO4 3QQ: not on the flood risk listCO4 3QR: not on the flood risk listCO4 3QS: not on the flood risk listCO4 3QT: not on the flood risk listCO4 3QX: not on the flood risk listCO4 3QZ: not on the flood risk listCO4 3RB: not on the flood risk listCO4 3RE: not on the flood risk listCO4 3RF: not on the flood risk listCO4 3RG: not on the flood risk listCO4 3RH: not on the flood risk listCO4 3RJ: not on the flood risk listCO4 3RN: not on the flood risk listCO4 3RP: not on the flood risk listCO4 3RR: not on the flood risk listCO4 3RS: not on the flood risk listCO4 3RT: not on the flood risk listCO4 3RU: not on the flood risk listCO4 3RW: not on the flood risk listCO4 3RZ: not on the flood risk listCO4 3SE: not on the flood risk listCO4 3SG: not on the flood risk listCO4 3SH: not on the flood risk listCO4 3SJ: not on the flood risk listCO4 3SL: not on the flood risk listCO4 3SN: not on the flood risk listCO4 3SQ: not on the flood risk listCO4 3SS: not on the flood risk listCO4 3ST: not on the flood risk listCO4 3SX: not on the flood risk listCO4 3SZ: not on the flood risk listCO4 3TA: not on the flood risk listCO4 3TB: not on the flood risk listCO4 3TD: not on the flood risk listCO4 3TF: not on the flood risk listCO4 3TG: not on the flood risk listCO4 3TH: not on the flood risk listCO4 3TJ: not on the flood risk listCO4 3TL: not on the flood risk listCO4 3TR: not on the flood risk listCO4 3TS: not on the flood risk listCO4 3TT: not on the flood risk listCO4 3TW: not on the flood risk listCO4 3TX: not on the flood risk listCO4 3TY: not on the flood risk listCO4 3UA: not on the flood risk listCO4 3UG: not on the flood risk listCO4 3UJ: not on the flood risk listCO4 3UL: not on the flood risk listCO4 3UP: not on the flood risk listCO4 3UR: not on the flood risk listCO4 3US: not on the flood risk listCO4 3UT: not on the flood risk listCO4 3UU: not on the flood risk listCO4 3UW: not on the flood risk listCO4 3UX: not on the flood risk listCO4 3UY: not on the flood risk listCO4 3UZ: not on the flood risk listCO4 3WP: not on the flood risk listCO4 3WZ: not on the flood risk listCO4 3XA: not on the flood risk listCO4 3XE: not on the flood risk listCO4 3XF: not on the flood risk listCO4 3XG: not on the flood risk listCO4 3XH: not on the flood risk listCO4 3XP: not on the flood risk listCO4 3XQ: not on the flood risk listCO4 3XR: not on the flood risk listCO4 3XS: not on the flood risk listCO4 3XT: not on the flood risk listCO4 3XU: not on the flood risk listCO4 3XW: not on the flood risk listCO4 3XX: not on the flood risk listCO4 3XY: not on the flood risk listCO4 3XZ: not on the flood risk listCO4 3YA: not on the flood risk listCO4 3YB: not on the flood risk listCO4 3YD: not on the flood risk listCO4 3YF: not on the flood risk listCO4 3YG: not on the flood risk listCO4 3YH: not on the flood risk listCO4 3YJ: not on the flood risk listCO4 3YN: not on the flood risk listCO4 3YP: not on the flood risk listCO4 3YS: not on the flood risk listCO4 3YT: not on the flood risk listCO4 3YX: not on the flood risk listCO4 3ZB: not on the flood risk listCO4 3ZD: not on the flood risk listCO4 3ZL: not on the flood risk listCO4 3ZN: not on the flood risk listCO4 3ZP: not on the flood risk listCO4 3ZQ: not on the flood risk listCO4 3ZS: not on the flood risk listCO4 3ZU: not on the flood risk listCO4 5AA: not on the flood risk listCO4 5AD: not on the flood risk listCO4 5AE: not on the flood risk listCO4 5AG: not on the flood risk listCO4 5AH: not on the flood risk listCO4 5AJ: not on the flood risk listCO4 5AL: not on the flood risk listCO4 5AN: not on the flood risk listCO4 5AP: not on the flood risk listCO4 5AQ: not on the flood risk listCO4 5AR: not on the flood risk listCO4 5AS: not on the flood risk listCO4 5AU: not on the flood risk listCO4 5AW: not on the flood risk listCO4 5AX: not on the flood risk listCO4 5AY: not on the flood risk listCO4 5AZ: not on the flood risk listCO4 5BA: not on the flood risk listCO4 5BB: not on the flood risk listCO4 5BD: not on the flood risk listCO4 5BE: not on the flood risk listCO4 5BG: not on the flood risk listCO4 5BH: not on the flood risk listCO4 5BJ: not on the flood risk listCO4 5BL: not on the flood risk listCO4 5BP: not on the flood risk listCO4 5BQ: not on the flood risk listCO4 5BT: not on the flood risk listCO4 5BU: not on the flood risk listCO4 5BW: not on the flood risk listCO4 5BY: not on the flood risk listCO4 5BZ: not on the flood risk listCO4 5DB: not on the flood risk listCO4 5DD: not on the flood risk listCO4 5DE: not on the flood risk listCO4 5DF: not on the flood risk listCO4 5DG: not on the flood risk listCO4 5DJ: not on the flood risk listCO4 5DL: not on the flood risk listCO4 5DN: not on the flood risk listCO4 5DP: not on the flood risk listCO4 5DQ: not on the flood risk listCO4 5DR: not on the flood risk listCO4 5DS: not on the flood risk listCO4 5DT: not on the flood risk listCO4 5DU: not on the flood risk listCO4 5DW: not on the flood risk listCO4 5DX: not on the flood risk listCO4 5DY: not on the flood risk listCO4 5DZ: not on the flood risk listCO4 5EA: not on the flood risk listCO4 5ED: not on the flood risk listCO4 5EE: not on the flood risk listCO4 5EF: not on the flood risk listCO4 5EG: not on the flood risk listCO4 5EH: not on the flood risk listCO4 5EJ: not on the flood risk listCO4 5EL: not on the flood risk listCO4 5EN: not on the flood risk listCO4 5EP: not on the flood risk listCO4 5EQ: not on the flood risk listCO4 5ES: not on the flood risk listCO4 5ET: not on the flood risk listCO4 5EU: not on the flood risk listCO4 5EW: not on the flood risk listCO4 5EX: not on the flood risk listCO4 5EY: not on the flood risk listCO4 5EZ: not on the flood risk listCO4 5FB: not on the flood risk listCO4 5FD: not on the flood risk listCO4 5FE: not on the flood risk listCO4 5FG: not on the flood risk listCO4 5FH: not on the flood risk listCO4 5FJ: not on the flood risk listCO4 5FL: not on the flood risk listCO4 5FN: not on the flood risk listCO4 5FP: not on the flood risk listCO4 5FQ: not on the flood risk listCO4 5FR: not on the flood risk listCO4 5FS: not on the flood risk listCO4 5FT: not on the flood risk listCO4 5FU: not on the flood risk listCO4 5FW: not on the flood risk listCO4 5FX: not on the flood risk listCO4 5FZ: not on the flood risk listCO4 5GA: not on the flood risk listCO4 5GB: not on the flood risk listCO4 5GD: not on the flood risk listCO4 5GE: not on the flood risk listCO4 5GH: not on the flood risk listCO4 5GL: not on the flood risk listCO4 5GN: not on the flood risk listCO4 5GP: not on the flood risk listCO4 5GQ: not on the flood risk listCO4 5GR: not on the flood risk listCO4 5GS: not on the flood risk listCO4 5GT: not on the flood risk listCO4 5GU: not on the flood risk listCO4 5GW: not on the flood risk listCO4 5GX: not on the flood risk listCO4 5GZ: not on the flood risk listCO4 5HA: not on the flood risk listCO4 5HB: not on the flood risk listCO4 5HD: not on the flood risk listCO4 5HE: not on the flood risk listCO4 5HF: not on the flood risk listCO4 5HG: not on the flood risk listCO4 5HH: not on the flood risk listCO4 5HJ: not on the flood risk listCO4 5HL: not on the flood risk listCO4 5HN: not on the flood risk listCO4 5HP: not on the flood risk listCO4 5HR: not on the flood risk listCO4 5HS: not on the flood risk listCO4 5HT: not on the flood risk listCO4 5HU: not on the flood risk listCO4 5HW: not on the flood risk listCO4 5HX: not on the flood risk listCO4 5HY: not on the flood risk listCO4 5HZ: not on the flood risk listCO4 5JA: not on the flood risk listCO4 5JB: not on the flood risk listCO4 5JD: not on the flood risk listCO4 5JF: not on the flood risk listCO4 5JG: not on the flood risk listCO4 5JJ: not on the flood risk listCO4 5JL: not on the flood risk listCO4 5JN: not on the flood risk listCO4 5JP: not on the flood risk listCO4 5JQ: not on the flood risk listCO4 5JR: not on the flood risk listCO4 5JS: not on the flood risk listCO4 5JT: not on the flood risk listCO4 5JU: not on the flood risk listCO4 5JW: not on the flood risk listCO4 5JX: not on the flood risk listCO4 5JY: not on the flood risk listCO4 5JZ: not on the flood risk listCO4 5LA: not on the flood risk listCO4 5LE: not on the flood risk listCO4 5LF: not on the flood risk listCO4 5LG: not on the flood risk listCO4 5LH: not on the flood risk listCO4 5LJ: not on the flood risk listCO4 5LL: not on the flood risk listCO4 5LN: not on the flood risk listCO4 5LP: not on the flood risk listCO4 5LR: not on the flood risk listCO4 5LS: not on the flood risk listCO4 5LT: not on the flood risk listCO4 5LX: not on the flood risk listCO4 5LZ: not on the flood risk listCO4 5NA: not on the flood risk listCO4 5NB: not on the flood risk listCO4 5ND: not on the flood risk listCO4 5NE: not on the flood risk listCO4 5NF: not on the flood risk listCO4 5NG: not on the flood risk listCO4 5NH: not on the flood risk listCO4 5NJ: not on the flood risk listCO4 5NL: not on the flood risk listCO4 5NN: not on the flood risk listCO4 5NP: not on the flood risk listCO4 5NQ: not on the flood risk listCO4 5NR: not on the flood risk listCO4 5NT: not on the flood risk listCO4 5NU: not on the flood risk listCO4 5NW: not on the flood risk listCO4 5NX: not on the flood risk listCO4 5NY: not on the flood risk listCO4 5NZ: not on the flood risk listCO4 5PA: not on the flood risk listCO4 5PB: not on the flood risk listCO4 5PD: not on the flood risk listCO4 5PE: not on the flood risk listCO4 5PF: not on the flood risk listCO4 5PG: not on the flood risk listCO4 5PH: not on the flood risk listCO4 5PJ: not on the flood risk listCO4 5PL: not on the flood risk listCO4 5PN: not on the flood risk listCO4 5PP: not on the flood risk listCO4 5PR: not on the flood risk listCO4 5PT: not on the flood risk listCO4 5PU: not on the flood risk listCO4 5PW: not on the flood risk listCO4 5PX: not on the flood risk listCO4 5PY: not on the flood risk listCO4 5PZ: not on the flood risk listCO4 5QA: not on the flood risk listCO4 5QB: not on the flood risk listCO4 5QD: not on the flood risk listCO4 5QE: not on the flood risk listCO4 5QF: not on the flood risk listCO4 5QG: not on the flood risk listCO4 5QH: not on the flood risk listCO4 5QJ: not on the flood risk listCO4 5QL: not on the flood risk listCO4 5QN: not on the flood risk listCO4 5QP: not on the flood risk listCO4 5QQ: not on the flood risk listCO4 5QR: not on the flood risk listCO4 5QS: not on the flood risk listCO4 5QT: not on the flood risk listCO4 5QU: not on the flood risk listCO4 5QW: not on the flood risk listCO4 5QX: not on the flood risk listCO4 5QY: not on the flood risk listCO4 5RA: not on the flood risk listCO4 5RB: not on the flood risk listCO4 5RD: not on the flood risk listCO4 5RE: not on the flood risk listCO4 5RF: not on the flood risk listCO4 5RG: not on the flood risk listCO4 5RH: not on the flood risk listCO4 5RJ: not on the flood risk listCO4 5RL: not on the flood risk listCO4 5RN: not on the flood risk listCO4 5RP: not on the flood risk listCO4 5RQ: not on the flood risk listCO4 5RR: not on the flood risk listCO4 5RS: not on the flood risk listCO4 5RT: not on the flood risk listCO4 5RU: not on the flood risk listCO4 5RW: not on the flood risk listCO4 5RX: not on the flood risk listCO4 5RY: not on the flood risk listCO4 5RZ: not on the flood risk listCO4 5SA: not on the flood risk listCO4 5SB: not on the flood risk listCO4 5SD: not on the flood risk listCO4 5SE: not on the flood risk listCO4 5SF: not on the flood risk listCO4 5SH: not on the flood risk listCO4 5SJ: not on the flood risk listCO4 5SL: not on the flood risk listCO4 5SP: not on the flood risk listCO4 5SQ: not on the flood risk listCO4 5SR: not on the flood risk listCO4 5ST: not on the flood risk listCO4 5SU: not on the flood risk listCO4 5SW: not on the flood risk listCO4 5SX: not on the flood risk listCO4 5SY: not on the flood risk listCO4 5SZ: not on the flood risk listCO4 5TD: not on the flood risk listCO4 5TE: not on the flood risk listCO4 5TF: not on the flood risk listCO4 5TG: not on the flood risk listCO4 5TH: not on the flood risk listCO4 5TJ: not on the flood risk listCO4 5TL: not on the flood risk listCO4 5TN: not on the flood risk listCO4 5TP: not on the flood risk listCO4 5TQ: not on the flood risk listCO4 5TR: not on the flood risk listCO4 5TS: not on the flood risk listCO4 5TT: not on the flood risk listCO4 5TU: not on the flood risk listCO4 5TW: not on the flood risk listCO4 5TX: not on the flood risk listCO4 5TY: not on the flood risk listCO4 5TZ: not on the flood risk listCO4 5UA: not on the flood risk listCO4 5UB: not on the flood risk listCO4 5UG: not on the flood risk listCO4 5UH: not on the flood risk listCO4 5UJ: not on the flood risk listCO4 5UL: not on the flood risk listCO4 5UP: not on the flood risk listCO4 5US: not on the flood risk listCO4 5UT: not on the flood risk listCO4 5UU: not on the flood risk listCO4 5UW: not on the flood risk listCO4 5UX: not on the flood risk listCO4 5UY: not on the flood risk listCO4 5UZ: not on the flood risk listCO4 5WA: not on the flood risk listCO4 5WB: not on the flood risk listCO4 5WD: not on the flood risk listCO4 5WF: not on the flood risk listCO4 5WG: not on the flood risk listCO4 5WH: not on the flood risk listCO4 5WJ: not on the flood risk listCO4 5WL: not on the flood risk listCO4 5WN: not on the flood risk listCO4 5WS: not on the flood risk listCO4 5WT: not on the flood risk listCO4 5WU: not on the flood risk listCO4 5WX: not on the flood risk listCO4 5WY: not on the flood risk listCO4 5WZ: not on the flood risk listCO4 5XA: not on the flood risk listCO4 5XB: not on the flood risk listCO4 5XD: not on the flood risk listCO4 5XE: not on the flood risk listCO4 5XF: not on the flood risk listCO4 5XG: not on the flood risk listCO4 5XH: not on the flood risk listCO4 5XL: not on the flood risk listCO4 5XQ: not on the flood risk listCO4 5XR: not on the flood risk listCO4 5XS: not on the flood risk listCO4 5XT: not on the flood risk listCO4 5XW: not on the flood risk listCO4 5XX: not on the flood risk listCO4 5XY: not on the flood risk listCO4 5YA: not on the flood risk listCO4 5YB: not on the flood risk listCO4 5YE: not on the flood risk listCO4 5YF: not on the flood risk listCO4 5YH: not on the flood risk listCO4 5YJ: not on the flood risk listCO4 5YN: not on the flood risk listCO4 5YP: not on the flood risk listCO4 5YQ: not on the flood risk listCO4 5YR: not on the flood risk listCO4 5YU: not on the flood risk listCO4 5YW: not on the flood risk listCO4 5YX: not on the flood risk listCO4 5YZ: not on the flood risk listCO4 5ZA: not on the flood risk listCO4 5ZB: not on the flood risk listCO4 5ZD: not on the flood risk listCO4 5ZE: not on the flood risk listCO4 5ZG: not on the flood risk listCO4 5ZH: not on the flood risk listCO4 5ZJ: not on the flood risk listCO4 5ZL: not on the flood risk listCO4 5ZN: not on the flood risk listCO4 5ZQ: not on the flood risk listCO4 5ZT: not on the flood risk listCO4 5ZU: not on the flood risk listCO4 5ZX: not on the flood risk listCO4 6AA: not on the flood risk listCO4 6AB: not on the flood risk listCO4 6AD: not on the flood risk listCO4 6AE: not on the flood risk listCO4 6AG: not on the flood risk listCO4 6AJ: not on the flood risk listCO4 6AL: not on the flood risk listCO4 6AN: not on the flood risk listCO4 6AP: not on the flood risk listCO4 6AQ: not on the flood risk listCO4 6AR: not on the flood risk listCO4 6AS: not on the flood risk listCO4 6AT: not on the flood risk listCO4 6AU: not on the flood risk listCO4 6AW: not on the flood risk listCO4 6AX: not on the flood risk listCO4 6AY: not on the flood risk listCO4 6AZ: not on the flood risk listCO4 6BA: not on the flood risk listCO4 6BB: not on the flood risk listCO4 6BE: not on the flood risk listCO4 6BF: not on the flood risk listCO4 6BG: not on the flood risk listCO4 6BH: not on the flood risk listCO4 6BJ: not on the flood risk listCO4 6BL: not on the flood risk listCO4 6BN: not on the flood risk listCO4 6BP: not on the flood risk listCO4 6BQ: not on the flood risk listCO4 6BR: not on the flood risk listCO4 6BS: not on the flood risk listCO4 6BU: not on the flood risk listCO4 6BX: not on the flood risk listCO4 6BY: not on the flood risk listCO4 6BZ: not on the flood risk listCO4 6DA: not on the flood risk listCO4 6DB: not on the flood risk listCO4 6DD: not on the flood risk listCO4 6DE: not on the flood risk listCO4 6DF: not on the flood risk listCO4 6DG: not on the flood risk listCO4 6DH: not on the flood risk listCO4 6DJ: not on the flood risk listCO4 6DL: not on the flood risk listCO4 6DP: not on the flood risk listCO4 6DQ: not on the flood risk listCO4 6DR: not on the flood risk listCO4 6DS: not on the flood risk listCO4 6DT: not on the flood risk listCO4 6DU: not on the flood risk listCO4 6DW: not on the flood risk listCO4 6DX: not on the flood risk listCO4 6DZ: not on the flood risk listCO4 6EB: not on the flood risk listCO4 6ED: not on the flood risk listCO4 6EE: not on the flood risk listCO4 6EG: not on the flood risk listCO4 6EH: not on the flood risk listCO4 6EJ: not on the flood risk listCO4 6EL: not on the flood risk listCO4 6EN: not on the flood risk listCO4 6EP: not on the flood risk listCO4 6ER: not on the flood risk listCO4 6ES: not on the flood risk listCO4 6EU: not on the flood risk listCO4 6EW: not on the flood risk listCO4 6EX: not on the flood risk listCO4 6EZ: not on the flood risk listCO4 6FA: not on the flood risk listCO4 6FB: not on the flood risk listCO4 6FD: not on the flood risk listCO4 6FE: not on the flood risk listCO4 6FF: not on the flood risk listCO4 6FG: not on the flood risk listCO4 6FH: not on the flood risk listCO4 6FJ: not on the flood risk listCO4 6FL: not on the flood risk listCO4 6FQ: not on the flood risk listCO4 7AA: not on the flood risk listCO4 7AB: not on the flood risk listCO4 7AE: not on the flood risk listCO4 9AA: not on the flood risk listCO4 9AB: not on the flood risk listCO4 9AD: not on the flood risk listCO4 9AE: not on the flood risk listCO4 9AF: not on the flood risk listCO4 9AG: not on the flood risk listCO4 9AH: not on the flood risk listCO4 9AL: not on the flood risk listCO4 9AN: not on the flood risk listCO4 9AP: not on the flood risk listCO4 9AR: not on the flood risk listCO4 9AS: not on the flood risk listCO4 9AT: not on the flood risk listCO4 9AU: not on the flood risk listCO4 9AW: not on the flood risk listCO4 9AX: not on the flood risk listCO4 9AY: not on the flood risk listCO4 9BA: not on the flood risk listCO4 9BB: not on the flood risk listCO4 9BD: not on the flood risk listCO4 9BE: not on the flood risk listCO4 9BG: not on the flood risk listCO4 9BH: not on the flood risk listCO4 9BJ: not on the flood risk listCO4 9BL: not on the flood risk listCO4 9BP: not on the flood risk listCO4 9EA: not on the flood risk listCO4 9EB: not on the flood risk listCO4 9ED: not on the flood risk listCO4 9EE: not on the flood risk listCO4 9EF: not on the flood risk listCO4 9ET: not on the flood risk listCO4 9EW: not on the flood risk listCO4 9EX: not on the flood risk listCO4 9EY: not on the flood risk listCO4 9FA: not on the flood risk listCO4 9FB: not on the flood risk listCO4 9FD: not on the flood risk listCO4 9FF: not on the flood risk listCO4 9FJ: not on the flood risk listCO4 9FL: not on the flood risk listCO4 9FN: not on the flood risk listCO4 9FP: not on the flood risk listCO4 9FR: not on the flood risk listCO4 9FS: not on the flood risk listCO4 9FW: not on the flood risk listCO4 9FX: not on the flood risk listCO4 9FY: not on the flood risk listCO4 9GB: not on the flood risk listCO4 9GD: not on the flood risk listCO4 9GF: not on the flood risk listCO4 9GN: not on the flood risk listCO4 9GP: not on the flood risk listCO4 9HA: not on the flood risk listCO4 9HB: not on the flood risk listCO4 9HD: not on the flood risk listCO4 9HR: not on the flood risk listCO4 9HS: not on the flood risk listCO4 9HT: not on the flood risk listCO4 9HU: not on the flood risk listCO4 9HW: not on the flood risk listCO4 9HY: not on the flood risk listCO4 9HZ: not on the flood risk listCO4 9JU: not on the flood risk listCO4 9PD: not on the flood risk listCO4 9PE: not on the flood risk listCO4 9PJ: not on the flood risk listCO4 9PU: not on the flood risk listCO4 9QB: not on the flood risk listCO4 9QF: not on the flood risk listCO4 9QH: not on the flood risk listCO4 9QJ: not on the flood risk listCO4 9QL: not on the flood risk listCO4 9QQ: not on the flood risk listCO4 9QR: not on the flood risk listCO4 9QS: not on the flood risk listCO4 9QT: not on the flood risk listCO4 9QU: not on the flood risk listCO4 9QX: not on the flood risk listCO4 9QY: not on the flood risk listCO4 9QZ: not on the flood risk listCO4 9RA: not on the flood risk listCO4 9RB: not on the flood risk listCO4 9RD: not on the flood risk listCO4 9RE: not on the flood risk listCO4 9RF: not on the flood risk listCO4 9RG: not on the flood risk listCO4 9RH: not on the flood risk listCO4 9RJ: not on the flood risk listCO4 9RL: not on the flood risk listCO4 9RN: not on the flood risk listCO4 9RP: not on the flood risk listCO4 9RQ: not on the flood risk listCO4 9RR: not on the flood risk listCO4 9RT: not on the flood risk listCO4 9RU: not on the flood risk listCO4 9RW: not on the flood risk listCO4 9RX: not on the flood risk listCO4 9RY: not on the flood risk listCO4 9RZ: not on the flood risk listCO4 9SB: not on the flood risk listCO4 9SD: not on the flood risk listCO4 9SE: not on the flood risk listCO4 9SF: not on the flood risk listCO4 9SG: not on the flood risk listCO4 9SH: not on the flood risk listCO4 9SJ: not on the flood risk listCO4 9SL: not on the flood risk listCO4 9SQ: not on the flood risk listCO4 9SR: not on the flood risk listCO4 9SS: not on the flood risk listCO4 9ST: not on the flood risk listCO4 9SU: not on the flood risk listCO4 9SW: not on the flood risk listCO4 9SX: not on the flood risk listCO4 9SY: not on the flood risk listCO4 9SZ: not on the flood risk listCO4 9TB: not on the flood risk listCO4 9TD: not on the flood risk listCO4 9TF: not on the flood risk listCO4 9TG: not on the flood risk listCO4 9TH: not on the flood risk listCO4 9TJ: not on the flood risk listCO4 9TL: not on the flood risk listCO4 9TN: not on the flood risk listCO4 9TP: not on the flood risk listCO4 9TQ: not on the flood risk listCO4 9TR: not on the flood risk listCO4 9TS: not on the flood risk listCO4 9TT: not on the flood risk listCO4 9TU: not on the flood risk listCO4 9TW: not on the flood risk listCO4 9TX: not on the flood risk listCO4 9UE: not on the flood risk listCO4 9UF: not on the flood risk listCO4 9UH: not on the flood risk listCO4 9UJ: not on the flood risk listCO4 9UN: not on the flood risk listCO4 9UR: not on the flood risk listCO4 9UW: not on the flood risk listCO4 9UX: not on the flood risk listCO4 9WG: not on the flood risk listCO4 9WH: not on the flood risk listCO4 9WJ: not on the flood risk listCO4 9WN: not on the flood risk listCO4 9WP: not on the flood risk listCO4 9WQ: not on the flood risk listCO4 9WW: not on the flood risk listCO4 9WX: not on the flood risk listCO4 9XE: not on the flood risk listCO4 9XN: not on the flood risk listCO4 9XP: not on the flood risk listCO4 9XR: not on the flood risk listCO4 9XS: not on the flood risk listCO4 9XT: not on the flood risk listCO4 9YA: not on the flood risk listCO4 9YB: not on the flood risk listCO4 9YD: not on the flood risk listCO4 9YE: not on the flood risk listCO4 9YF: not on the flood risk listCO4 9YJ: not on the flood risk listCO4 9YR: not on the flood risk listCO4 3AA: very low flood risk onlyCO4 3AB: very low flood risk onlyCO4 3AD: very low flood risk onlyCO4 3BL: very low flood risk onlyCO4 3GG: very low flood risk onlyCO4 3UN: very low flood risk onlyCO4 3ZH: very low flood risk onlyCO4 3ZR: very low flood risk onlyCO4 3ZT: very low flood risk onlyCO4 0AU: low flood risk at worstCO4 3AZ: low flood risk at worstCO4 3BB: low flood risk at worstCO4 3BD: low flood risk at worstCO4 5SN: low flood risk at worstCO4 5SS: low flood risk at worstCO4 5TA: medium flood risk at worstCO4 3AL: high flood riskCO4 3DL: high flood riskCO4 3GD: high flood riskCO4 3ZA: high flood riskCO4 3ZE: high flood riskCO4 3ZF: high flood riskCO4 5PS: high flood riskCO4 5TB: high flood risk ColchesterWest BergholtGreat Horkesley 5 postcodes at high or medium risk, outlined: this goes to CO4 3ZA, the one with most homes and businesses at high risk5 postcodes at high or medium risk Map of every postcode in CO4, by flood risk Of the 1,193 postcodes in CO4 that ONS places, 11 have a home or business at high risk, 1 are at medium risk at worst, 6 are at low risk at worst, 9 are at very low risk only and 1,166 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 5 postcodes at high or medium risk. Places named: Colchester, Great Horkesley. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A134A137A120 ColchesterGreat Horkesley
  • A home or business at high risk: 11
  • At medium risk at worst: 1
  • At low risk at worst: 6
  • At very low risk only: 9
  • Not on the at-risk list: 1,166
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 1,193 postcodes in CO4 that ONS places, 11 have a home or business at high risk, 1 are at medium risk at worst, 6 are at low risk at worst, 9 are at very low risk only and 1,166 are not on the Environment Agency's at-risk list.

Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. A dashed outline shows where 5 or more lie within 150 metres of each other. It is not a boundary, and no boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.

The middle of its postcodes: latitude 51.9093, longitude 0.9191. Open this area on OpenStreetMap

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; flood risk: Environment Agency, published 6 July 2026; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them

The postcodes at high risk

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

CO4 3ZA283 at high riskCO4 3ZF32 at high riskCO4 3GD30 at high riskCO4 3ZE28 at high riskCO4 3DP17 at high riskCO4 3ZG11 at high riskCO4 3ZJ11 at high riskCO4 5TB7 at high riskCO4 3AL2 at high riskCO4 3DL1 at high riskCO4 5PS1 at high risk

Where the postcodes at high or medium risk lie together

  • 5 postcodes at high or medium risk, outlined on the map. CO4 3ZA, is the one with most homes and businesses at high risk.

What broadband can you get in CO4?

Ofcom reports on 1,177 of the 1,193 postcodes in CO4. At 922 of them every home and business can get gigabit broadband, and at 8 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit922 of 1,177
Postcodes where every home can get superfast1,118 of 1,177
Postcodes where some cannot get decent broadband8 of 1,177

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is CO4 at risk of flooding?

27 of the 1,193 postcodes in CO4 have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 436 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 27 of 1,193 postcodes High: 423Medium: 13Low: 79Very low: 114

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in CO4?

Homes in CO4 sold for a typical £325,000 in the 12 months to August 2026, across 535 sales, up 1.6% on the 12 months before, HM Land Registry's figures show.

£325,000 typical price, the 12 months to August 2026
12 months to August 2025
£320,000
12 months to August 2026
£325,000

▲ up 1.6% on the 12 months before

Detached£422,500 174 sales
Semi-detached£320,000 167 sales
Terraced£280,000 118 sales
Flat or maisonette£173,000 76 sales

Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

Source: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it

Postcodes in CO4

Pick a sector, then a postcode. A sector is the district plus the next digit.

CO4 0168 postcodesCO4 3346 postcodesCO4 5394 postcodesCO4 691 postcodesCO4 74 postcodesCO4 9190 postcodes
UK postcode format explained

Places in CO4

Towns and villages with postcodes in CO4, and how many each has here.

Colchester postcodes,1,046

Who covers CO4

How many of the district's postcodes in use fall under each council, constituency and police force area.

Councils

What council am I in?

Constituencies

  • Colchester1,025
  • Harwich and North Essex168

Police force areas

  • Essex1,193

Next to CO4

CO3 postcode district CO5 postcode district All CO districts Colchester postcodes

"Next to" is by number: the districts before and after CO4 in the CO area.

Check a postcode

Something wrong on this page? Report an error and we will check it against the source.