CO3 postcode district: Colchester and around, Essex

CO3 is a postcode district in Essex, with 864 postcodes in use in 5 sectors. It has postcodes in Colchester. Its council is Colchester.

Postcodes in use
864
Sectors
5
Council
Colchester
Places
Colchester

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

Every postcode in CO3, by flood risk

Map of every postcode in CO3, by flood risk Of the 864 postcodes in CO3 that ONS places, 8 have a home or business at high risk, 4 are at medium risk at worst, 4 are at low risk at worst, 1 are at very low risk only and 847 are not on the Environment Agency's at-risk list. Places named: Colchester, Berechurch. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. CO3 0AB: not on the flood risk listCO3 0AD: not on the flood risk listCO3 0AE: not on the flood risk listCO3 0AG: not on the flood risk listCO3 0AH: not on the flood risk listCO3 0AJ: not on the flood risk listCO3 0AL: not on the flood risk listCO3 0AN: not on the flood risk listCO3 0AP: not on the flood risk listCO3 0AQ: not on the flood risk listCO3 0AR: not on the flood risk listCO3 0AS: not on the flood risk listCO3 0AT: not on the flood risk listCO3 0AU: not on the flood risk listCO3 0AW: not on the flood risk listCO3 0AY: not on the flood risk listCO3 0BA: not on the flood risk listCO3 0BB: not on the flood risk listCO3 0BD: not on the flood risk listCO3 0BE: not on the flood risk listCO3 0BH: not on the flood risk listCO3 0BJ: not on the flood risk listCO3 0BN: not on the flood risk listCO3 0EB: not on the flood risk listCO3 0FG: not on the flood risk listCO3 0FL: not on the flood risk listCO3 0FQ: not on the flood risk listCO3 0FU: not on the flood risk listCO3 0FZ: not on the flood risk listCO3 0GH: not on the flood risk listCO3 0GJ: not on the flood risk listCO3 0GL: not on the flood risk listCO3 0GN: not on the flood risk listCO3 0GW: not on the flood risk listCO3 0HA: not on the flood risk listCO3 0HD: not on the flood risk listCO3 0HE: not on the flood risk listCO3 0HF: not on the flood risk listCO3 0HG: not on the flood risk listCO3 0HH: not on the flood risk listCO3 0HJ: not on the flood risk listCO3 0HL: not on the flood risk listCO3 0HN: not on the flood risk listCO3 0HP: not on the flood risk listCO3 0HQ: not on the flood risk listCO3 0HR: not on the flood risk listCO3 0HS: not on the flood risk listCO3 0HT: not on the flood risk listCO3 0HU: not on the flood risk listCO3 0HW: not on the flood risk listCO3 0HX: not on the flood risk listCO3 0HY: not on the flood risk listCO3 0HZ: not on the flood risk listCO3 0JA: not on the flood risk listCO3 0JB: not on the flood risk listCO3 0JD: not on the flood risk listCO3 0JE: not on the flood risk listCO3 0JF: not on the flood risk listCO3 0JG: not on the flood risk listCO3 0JH: not on the flood risk listCO3 0JJ: not on the flood risk listCO3 0JN: not on the flood risk listCO3 0JP: not on the flood risk listCO3 0JQ: not on the flood risk listCO3 0JR: not on the flood risk listCO3 0JS: not on the flood risk listCO3 0JT: not on the flood risk listCO3 0JU: not on the flood risk listCO3 0JW: not on the flood risk listCO3 0JX: not on the flood risk listCO3 0JZ: not on the flood risk listCO3 0LA: not on the flood risk listCO3 0LB: not on the flood risk listCO3 0LE: not on the flood risk listCO3 0LF: not on the flood risk listCO3 0LG: not on the flood risk listCO3 0LH: not on the flood risk listCO3 0LJ: not on the flood risk listCO3 0LL: not on the flood risk listCO3 0LN: not on the flood risk listCO3 0LQ: not on the flood risk listCO3 0LR: not on the flood risk listCO3 0LS: not on the flood risk listCO3 0LW: not on the flood risk listCO3 0LX: not on the flood risk listCO3 0NH: not on the flood risk listCO3 0NJ: not on the flood risk listCO3 0NL: not on the flood risk listCO3 0NN: not on the flood risk listCO3 0NP: not on the flood risk listCO3 0NQ: not on the flood risk listCO3 0NX: not on the flood risk listCO3 0NY: not on the flood risk listCO3 0PA: not on the flood risk listCO3 0PB: not on the flood risk listCO3 0PE: not on the flood risk listCO3 0PG: not on the flood risk listCO3 0PJ: not on the flood risk listCO3 0PN: not on the flood risk listCO3 0PP: not on the flood risk listCO3 0PQ: not on the flood risk listCO3 0PR: not on the flood risk listCO3 0PS: not on the flood risk listCO3 0PU: not on the flood risk listCO3 0PW: not on the flood risk listCO3 0PX: not on the flood risk listCO3 0PY: not on the flood risk listCO3 0PZ: not on the flood risk listCO3 0QA: not on the flood risk listCO3 0QF: not on the flood risk listCO3 0QG: not on the flood risk listCO3 0QH: not on the flood risk listCO3 0QL: not on the flood risk listCO3 0QN: not on the flood risk listCO3 0QP: not on the flood risk listCO3 0QQ: not on the flood risk listCO3 0QR: not on the flood risk listCO3 0QS: not on the flood risk listCO3 0QT: not on the flood risk listCO3 0QU: not on the flood risk listCO3 0QW: not on the flood risk listCO3 0QX: not on the flood risk listCO3 0QY: not on the flood risk listCO3 0QZ: not on the flood risk listCO3 0RA: not on the flood risk listCO3 0RB: not on the flood risk listCO3 0RD: not on the flood risk listCO3 0RE: not on the flood risk listCO3 0RF: not on the flood risk listCO3 0RG: not on the flood risk listCO3 0RH: not on the flood risk listCO3 0RJ: not on the flood risk listCO3 0RL: not on the flood risk listCO3 0RN: not on the flood risk listCO3 0RP: not on the flood risk listCO3 0RQ: not on the flood risk listCO3 0RR: not on the flood risk listCO3 0RS: not on the flood risk listCO3 0RT: not on the flood risk listCO3 0RU: not on the flood risk listCO3 0RW: not on the flood risk listCO3 0RX: not on the flood risk listCO3 0RY: not on the flood risk listCO3 0RZ: not on the flood risk listCO3 0SA: not on the flood risk listCO3 0SD: not on the flood risk listCO3 0SE: not on the flood risk listCO3 0SF: not on the flood risk listCO3 0SG: not on the flood risk listCO3 0SH: not on the flood risk listCO3 0SJ: not on the flood risk listCO3 0SN: not on the flood risk listCO3 0SP: not on the flood risk listCO3 0SR: not on the flood risk listCO3 0SW: not on the flood risk listCO3 0UG: not on the flood risk listCO3 0UH: not on the flood risk listCO3 0US: not on the flood risk listCO3 0UT: not on the flood risk listCO3 0UU: not on the flood risk listCO3 0WE: not on the flood risk listCO3 0WF: not on the flood risk listCO3 0WL: not on the flood risk listCO3 0YA: not on the flood risk listCO3 0YB: not on the flood risk listCO3 0YD: not on the flood risk listCO3 0YF: not on the flood risk listCO3 0YG: not on the flood risk listCO3 0YH: not on the flood risk listCO3 0YJ: not on the flood risk listCO3 0YL: not on the flood risk listCO3 0YP: not on the flood risk listCO3 0YQ: not on the flood risk listCO3 0YS: not on the flood risk listCO3 0YT: not on the flood risk listCO3 0YU: not on the flood risk listCO3 0YW: not on the flood risk listCO3 0YX: not on the flood risk listCO3 0YY: not on the flood risk listCO3 3AA: not on the flood risk listCO3 3AB: not on the flood risk listCO3 3AD: not on the flood risk listCO3 3AE: not on the flood risk listCO3 3AG: not on the flood risk listCO3 3AJ: not on the flood risk listCO3 3AL: not on the flood risk listCO3 3AN: not on the flood risk listCO3 3AP: not on the flood risk listCO3 3AR: not on the flood risk listCO3 3AS: not on the flood risk listCO3 3AT: not on the flood risk listCO3 3AU: not on the flood risk listCO3 3AW: not on the flood risk listCO3 3AX: not on the flood risk listCO3 3AY: not on the flood risk listCO3 3AZ: not on the flood risk listCO3 3BA: not on the flood risk listCO3 3BB: not on the flood risk listCO3 3BD: not on the flood risk listCO3 3BE: not on the flood risk listCO3 3BG: not on the flood risk listCO3 3BH: not on the flood risk listCO3 3BL: not on the flood risk listCO3 3BP: not on the flood risk listCO3 3BQ: not on the flood risk listCO3 3BT: not on the flood risk listCO3 3BU: not on the flood risk listCO3 3BW: not on the flood risk listCO3 3BZ: not on the flood risk listCO3 3DA: not on the flood risk listCO3 3DB: not on the flood risk listCO3 3DD: not on the flood risk listCO3 3DE: not on the flood risk listCO3 3DG: not on the flood risk listCO3 3DH: not on the flood risk listCO3 3DL: not on the flood risk listCO3 3DP: not on the flood risk listCO3 3DQ: not on the flood risk listCO3 3DR: not on the flood risk listCO3 3DS: not on the flood risk listCO3 3DT: not on the flood risk listCO3 3DU: not on the flood risk listCO3 3DW: not on the flood risk listCO3 3DX: not on the flood risk listCO3 3DZ: not on the flood risk listCO3 3EA: not on the flood risk listCO3 3EB: not on the flood risk listCO3 3ED: not on the flood risk listCO3 3EE: not on the flood risk listCO3 3EN: not on the flood risk listCO3 3EY: not on the flood risk listCO3 3EZ: not on the flood risk listCO3 3FA: not on the flood risk listCO3 3FF: not on the flood risk listCO3 3FG: not on the flood risk listCO3 3FN: not on the flood risk listCO3 3FP: not on the flood risk listCO3 3FQ: not on the flood risk listCO3 3GB: not on the flood risk listCO3 3GE: not on the flood risk listCO3 3GT: not on the flood risk listCO3 3HA: not on the flood risk listCO3 3HD: not on the flood risk listCO3 3HE: not on the flood risk listCO3 3HJ: not on the flood risk listCO3 3HL: not on the flood risk listCO3 3HN: not on the flood risk listCO3 3HP: not on the flood risk listCO3 3HQ: not on the flood risk listCO3 3HR: not on the flood risk listCO3 3HT: not on the flood risk listCO3 3HU: not on the flood risk listCO3 3HX: not on the flood risk listCO3 3HY: not on the flood risk listCO3 3JB: not on the flood risk listCO3 3JD: not on the flood risk listCO3 3JF: not on the flood risk listCO3 3JG: not on the flood risk listCO3 3JH: not on the flood risk listCO3 3JJ: not on the flood risk listCO3 3JN: not on the flood risk listCO3 3JQ: not on the flood risk listCO3 3JR: not on the flood risk listCO3 3JW: not on the flood risk listCO3 3LE: not on the flood risk listCO3 3LF: not on the flood risk listCO3 3LL: not on the flood risk listCO3 3LT: not on the flood risk listCO3 3LZ: not on the flood risk listCO3 3ND: not on the flood risk listCO3 3NE: not on the flood risk listCO3 3NF: not on the flood risk listCO3 3NG: not on the flood risk listCO3 3NH: not on the flood risk listCO3 3NL: not on the flood risk listCO3 3NP: not on the flood risk listCO3 3NR: not on the flood risk listCO3 3NS: not on the flood risk listCO3 3NU: not on the flood risk listCO3 3NX: not on the flood risk listCO3 3NY: not on the flood risk listCO3 3NZ: not on the flood risk listCO3 3PA: not on the flood risk listCO3 3PB: not on the flood risk listCO3 3PD: not on the flood risk listCO3 3PE: not on the flood risk listCO3 3PH: not on the flood risk listCO3 3PJ: not on the flood risk listCO3 3PL: not on the flood risk listCO3 3PN: not on the flood risk listCO3 3PR: not on the flood risk listCO3 3PS: not on the flood risk listCO3 3PT: not on the flood risk listCO3 3PW: not on the flood risk listCO3 3PY: not on the flood risk listCO3 3PZ: not on the flood risk listCO3 3QA: not on the flood risk listCO3 3QD: not on the flood risk listCO3 3QE: not on the flood risk listCO3 3QF: not on the flood risk listCO3 3QG: not on the flood risk listCO3 3QJ: not on the flood risk listCO3 3QL: not on the flood risk listCO3 3QN: not on the flood risk listCO3 3QP: not on the flood risk listCO3 3QQ: not on the flood risk listCO3 3QR: not on the flood risk listCO3 3QS: not on the flood risk listCO3 3QU: not on the flood risk listCO3 3QW: not on the flood risk listCO3 3QY: not on the flood risk listCO3 3RA: not on the flood risk listCO3 3RB: not on the flood risk listCO3 3RD: not on the flood risk listCO3 3RF: not on the flood risk listCO3 3RG: not on the flood risk listCO3 3RH: not on the flood risk listCO3 3RN: not on the flood risk listCO3 3RP: not on the flood risk listCO3 3RR: not on the flood risk listCO3 3RS: not on the flood risk listCO3 3RT: not on the flood risk listCO3 3RU: not on the flood risk listCO3 3RW: not on the flood risk listCO3 3RX: not on the flood risk listCO3 3RY: not on the flood risk listCO3 3RZ: not on the flood risk listCO3 3SA: not on the flood risk listCO3 3SD: not on the flood risk listCO3 3SE: not on the flood risk listCO3 3SF: not on the flood risk listCO3 3SG: not on the flood risk listCO3 3SH: not on the flood risk listCO3 3SP: not on the flood risk listCO3 3SQ: not on the flood risk listCO3 3SR: not on the flood risk listCO3 3SS: not on the flood risk listCO3 3ST: not on the flood risk listCO3 3SU: not on the flood risk listCO3 3SX: not on the flood risk listCO3 3SY: not on the flood risk listCO3 3SZ: not on the flood risk listCO3 3TA: not on the flood risk listCO3 3TB: not on the flood risk listCO3 3TD: not on the flood risk listCO3 3TE: not on the flood risk listCO3 3TF: not on the flood risk listCO3 3TL: not on the flood risk listCO3 3TP: not on the flood risk listCO3 3TR: not on the flood risk listCO3 3TS: not on the flood risk listCO3 3TT: not on the flood risk listCO3 3TU: not on the flood risk listCO3 3TW: not on the flood risk listCO3 3TX: not on the flood risk listCO3 3TY: not on the flood risk listCO3 3UA: not on the flood risk listCO3 3UD: not on the flood risk listCO3 3UE: not on the flood risk listCO3 3UJ: not on the flood risk listCO3 3UL: not on the flood risk listCO3 3UN: not on the flood risk listCO3 3US: not on the flood risk listCO3 3UZ: not on the flood risk listCO3 3WD: not on the flood risk listCO3 3WL: not on the flood risk listCO3 3YB: not on the flood risk listCO3 4AA: not on the flood risk listCO3 4AB: not on the flood risk listCO3 4AD: not on the flood risk listCO3 4AE: not on the flood risk listCO3 4AF: not on the flood risk listCO3 4AG: not on the flood risk listCO3 4AH: not on the flood risk listCO3 4AJ: not on the flood risk listCO3 4AL: not on the flood risk listCO3 4AS: not on the flood risk listCO3 4AU: not on the flood risk listCO3 4BH: not on the flood risk listCO3 4BJ: not on the flood risk listCO3 4BL: not on the flood risk listCO3 4BN: not on the flood risk listCO3 4BP: not on the flood risk listCO3 4BS: not on the flood risk listCO3 4BT: not on the flood risk listCO3 4BU: not on the flood risk listCO3 4BZ: not on the flood risk listCO3 4DA: not on the flood risk listCO3 4DB: not on the flood risk listCO3 4DD: not on the flood risk listCO3 4DE: not on the flood risk listCO3 4DF: not on the flood risk listCO3 4DG: not on the flood risk listCO3 4DH: not on the flood risk listCO3 4DJ: not on the flood risk listCO3 4DL: not on the flood risk listCO3 4DP: not on the flood risk listCO3 4DQ: not on the flood risk listCO3 4DT: not on the flood risk listCO3 4DU: not on the flood risk listCO3 4DX: not on the flood risk listCO3 4DZ: not on the flood risk listCO3 4EA: not on the flood risk listCO3 4ED: not on the flood risk listCO3 4EE: not on the flood risk listCO3 4EF: not on the flood risk listCO3 4EG: not on the flood risk listCO3 4EH: not on the flood risk listCO3 4EJ: not on the flood risk listCO3 4EL: not on the flood risk listCO3 4EN: not on the flood risk listCO3 4EP: not on the flood risk listCO3 4EQ: not on the flood risk listCO3 4ER: not on the flood risk listCO3 4EW: not on the flood risk listCO3 4HA: not on the flood risk listCO3 4HD: not on the flood risk listCO3 4HE: not on the flood risk listCO3 4HF: not on the flood risk listCO3 4HG: not on the flood risk listCO3 4HH: not on the flood risk listCO3 4HJ: not on the flood risk listCO3 4HL: not on the flood risk listCO3 4HN: not on the flood risk listCO3 4HP: not on the flood risk listCO3 4HQ: not on the flood risk listCO3 4HR: not on the flood risk listCO3 4HU: not on the flood risk listCO3 4HW: not on the flood risk listCO3 4HZ: not on the flood risk listCO3 4JA: not on the flood risk listCO3 4JD: not on the flood risk listCO3 4JE: not on the flood risk listCO3 4JH: not on the flood risk listCO3 4JJ: not on the flood risk listCO3 4JL: not on the flood risk listCO3 4JN: not on the flood risk listCO3 4JP: not on the flood risk listCO3 4JR: not on the flood risk listCO3 4JX: not on the flood risk listCO3 4JY: not on the flood risk listCO3 4JZ: not on the flood risk listCO3 4LA: not on the flood risk listCO3 4LB: not on the flood risk listCO3 4LD: not on the flood risk listCO3 4LG: not on the flood risk listCO3 4LH: not on the flood risk listCO3 4LJ: not on the flood risk listCO3 4LL: not on the flood risk listCO3 4LN: not on the flood risk listCO3 4LP: not on the flood risk listCO3 4LR: not on the flood risk listCO3 4LS: not on the flood risk listCO3 4LT: not on the flood risk listCO3 4LU: not on the flood risk listCO3 4LY: not on the flood risk listCO3 4NE: not on the flood risk listCO3 4NF: not on the flood risk listCO3 4NG: not on the flood risk listCO3 4NH: not on the flood risk listCO3 4NL: not on the flood risk listCO3 4NP: not on the flood risk listCO3 4NQ: not on the flood risk listCO3 4NR: not on the flood risk listCO3 4NS: not on the flood risk listCO3 4NT: not on the flood risk listCO3 4NU: not on the flood risk listCO3 4NW: not on the flood risk listCO3 4NX: not on the flood risk listCO3 4NZ: not on the flood risk listCO3 4PA: not on the flood risk listCO3 4PB: not on the flood risk listCO3 4PD: not on the flood risk listCO3 4PE: not on the flood risk listCO3 4PG: not on the flood risk listCO3 4PH: not on the flood risk listCO3 4PJ: not on the flood risk listCO3 4PQ: not on the flood risk listCO3 4PS: not on the flood risk listCO3 4PZ: not on the flood risk listCO3 4QD: not on the flood risk listCO3 4QE: not on the flood risk listCO3 4QF: not on the flood risk listCO3 4QG: not on the flood risk listCO3 4QH: not on the flood risk listCO3 4QJ: not on the flood risk listCO3 4QN: not on the flood risk listCO3 4QP: not on the flood risk listCO3 4QQ: not on the flood risk listCO3 4QR: not on the flood risk listCO3 4QS: not on the flood risk listCO3 4QT: not on the flood risk listCO3 4QW: not on the flood risk listCO3 4QX: not on the flood risk listCO3 4RA: not on the flood risk listCO3 4RB: not on the flood risk listCO3 4RD: not on the flood risk listCO3 4RF: not on the flood risk listCO3 4RG: not on the flood risk listCO3 4RH: not on the flood risk listCO3 4RJ: not on the flood risk listCO3 4RL: not on the flood risk listCO3 4RN: not on the flood risk listCO3 4RP: not on the flood risk listCO3 4RQ: not on the flood risk listCO3 4RT: not on the flood risk listCO3 4RU: not on the flood risk listCO3 4RW: not on the flood risk listCO3 4RX: not on the flood risk listCO3 4RY: not on the flood risk listCO3 4RZ: not on the flood risk listCO3 4SA: not on the flood risk listCO3 4SB: not on the flood risk listCO3 4SD: not on the flood risk listCO3 4SE: not on the flood risk listCO3 4SF: not on the flood risk listCO3 4SG: not on the flood risk listCO3 4SH: not on the flood risk listCO3 4SJ: not on the flood risk listCO3 4SL: not on the flood risk listCO3 4SN: not on the flood risk listCO3 4SP: not on the flood risk listCO3 4SQ: not on the flood risk listCO3 4SR: not on the flood risk listCO3 4SS: not on the flood risk listCO3 4ST: not on the flood risk listCO3 4SU: not on the flood risk listCO3 4SW: not on the flood risk listCO3 4SZ: not on the flood risk listCO3 4TA: not on the flood risk listCO3 4TD: not on the flood risk listCO3 8AA: not on the flood risk listCO3 8AB: not on the flood risk listCO3 8AD: not on the flood risk listCO3 8AF: not on the flood risk listCO3 8AG: not on the flood risk listCO3 8AH: not on the flood risk listCO3 8AL: not on the flood risk listCO3 8AQ: not on the flood risk listCO3 8AR: not on the flood risk listCO3 8AS: not on the flood risk listCO3 8AU: not on the flood risk listCO3 8AW: not on the flood risk listCO3 8AX: not on the flood risk listCO3 8AY: not on the flood risk listCO3 8AZ: not on the flood risk listCO3 8BA: not on the flood risk listCO3 8BB: not on the flood risk listCO3 8BD: not on the flood risk listCO3 8BE: not on the flood risk listCO3 8BG: not on the flood risk listCO3 8BJ: not on the flood risk listCO3 8BL: not on the flood risk listCO3 8BP: not on the flood risk listCO3 8BQ: not on the flood risk listCO3 8BS: not on the flood risk listCO3 8BT: not on the flood risk listCO3 8BU: not on the flood risk listCO3 8BW: not on the flood risk listCO3 8BX: not on the flood risk listCO3 8BY: not on the flood risk listCO3 8BZ: not on the flood risk listCO3 8DB: not on the flood risk listCO3 8DD: not on the flood risk listCO3 8DE: not on the flood risk listCO3 8DF: not on the flood risk listCO3 8DG: not on the flood risk listCO3 8DH: not on the flood risk listCO3 8DJ: not on the flood risk listCO3 8DN: not on the flood risk listCO3 8DP: not on the flood risk listCO3 8DQ: not on the flood risk listCO3 8DS: not on the flood risk listCO3 8DU: not on the flood risk listCO3 8DW: not on the flood risk listCO3 8DX: not on the flood risk listCO3 8DY: not on the flood risk listCO3 8LP: not on the flood risk listCO3 8LR: not on the flood risk listCO3 8LS: not on the flood risk listCO3 8LT: not on the flood risk listCO3 8LX: not on the flood risk listCO3 8LZ: not on the flood risk listCO3 8NE: not on the flood risk listCO3 8NF: not on the flood risk listCO3 8NG: not on the flood risk listCO3 8NQ: not on the flood risk listCO3 8NZ: not on the flood risk listCO3 8PA: not on the flood risk listCO3 8PB: not on the flood risk listCO3 8PD: not on the flood risk listCO3 8PE: not on the flood risk listCO3 8PF: not on the flood risk listCO3 8PH: not on the flood risk listCO3 8RF: not on the flood risk listCO3 8RG: not on the flood risk listCO3 8RH: not on the flood risk listCO3 8RJ: not on the flood risk listCO3 8SS: not on the flood risk listCO3 8WA: not on the flood risk listCO3 8WB: not on the flood risk listCO3 8WH: not on the flood risk listCO3 8WL: not on the flood risk listCO3 8WN: not on the flood risk listCO3 8WP: not on the flood risk listCO3 8WQ: not on the flood risk listCO3 8WR: not on the flood risk listCO3 8WT: not on the flood risk listCO3 8WX: not on the flood risk listCO3 8WZ: not on the flood risk listCO3 8ZB: not on the flood risk listCO3 8ZD: not on the flood risk listCO3 8ZE: not on the flood risk listCO3 9AA: not on the flood risk listCO3 9AB: not on the flood risk listCO3 9AD: not on the flood risk listCO3 9AE: not on the flood risk listCO3 9AG: not on the flood risk listCO3 9AH: not on the flood risk listCO3 9AJ: not on the flood risk listCO3 9AL: not on the flood risk listCO3 9AN: not on the flood risk listCO3 9AP: not on the flood risk listCO3 9AR: not on the flood risk listCO3 9AS: not on the flood risk listCO3 9AT: not on the flood risk listCO3 9AU: not on the flood risk listCO3 9AW: not on the flood risk listCO3 9AX: not on the flood risk listCO3 9AY: not on the flood risk listCO3 9AZ: not on the flood risk listCO3 9BA: not on the flood risk listCO3 9BB: not on the flood risk listCO3 9BD: not on the flood risk listCO3 9BE: not on the flood risk listCO3 9BG: not on the flood risk listCO3 9BJ: not on the flood risk listCO3 9BN: not on the flood risk listCO3 9BP: not on the flood risk listCO3 9BQ: not on the flood risk listCO3 9BS: not on the flood risk listCO3 9BT: not on the flood risk listCO3 9BU: not on the flood risk listCO3 9BX: not on the flood risk listCO3 9BY: not on the flood risk listCO3 9BZ: not on the flood risk listCO3 9DA: not on the flood risk listCO3 9DB: not on the flood risk listCO3 9DD: not on the flood risk listCO3 9DE: not on the flood risk listCO3 9DF: not on the flood risk listCO3 9DG: not on the flood risk listCO3 9DH: not on the flood risk listCO3 9DJ: not on the flood risk listCO3 9DL: not on the flood risk listCO3 9DQ: not on the flood risk listCO3 9DR: not on the flood risk listCO3 9DS: not on the flood risk listCO3 9DT: not on the flood risk listCO3 9DU: not on the flood risk listCO3 9DX: not on the flood risk listCO3 9DY: not on the flood risk listCO3 9DZ: not on the flood risk listCO3 9EA: not on the flood risk listCO3 9EB: not on the flood risk listCO3 9ED: not on the flood risk listCO3 9EF: not on the flood risk listCO3 9EG: not on the flood risk listCO3 9EH: not on the flood risk listCO3 9EJ: not on the flood risk listCO3 9EL: not on the flood risk listCO3 9EN: not on the flood risk listCO3 9EP: not on the flood risk listCO3 9ER: not on the flood risk listCO3 9ES: not on the flood risk listCO3 9ET: not on the flood risk listCO3 9EU: not on the flood risk listCO3 9EW: not on the flood risk listCO3 9EY: not on the flood risk listCO3 9FA: not on the flood risk listCO3 9FB: not on the flood risk listCO3 9FE: not on the flood risk listCO3 9FH: not on the flood risk listCO3 9FJ: not on the flood risk listCO3 9FL: not on the flood risk listCO3 9FN: not on the flood risk listCO3 9FP: not on the flood risk listCO3 9FQ: not on the flood risk listCO3 9FR: not on the flood risk listCO3 9FS: not on the flood risk listCO3 9FT: not on the flood risk listCO3 9FW: not on the flood risk listCO3 9FX: not on the flood risk listCO3 9FY: not on the flood risk listCO3 9FZ: not on the flood risk listCO3 9GA: not on the flood risk listCO3 9GB: not on the flood risk listCO3 9GS: not on the flood risk listCO3 9ST: not on the flood risk listCO3 9TA: not on the flood risk listCO3 9TE: not on the flood risk listCO3 9TG: not on the flood risk listCO3 9TH: not on the flood risk listCO3 9TJ: not on the flood risk listCO3 9TL: not on the flood risk listCO3 9TN: not on the flood risk listCO3 9TP: not on the flood risk listCO3 9TQ: not on the flood risk listCO3 9TR: not on the flood risk listCO3 9TS: not on the flood risk listCO3 9TT: not on the flood risk listCO3 9TU: not on the flood risk listCO3 9TW: not on the flood risk listCO3 9TX: not on the flood risk listCO3 9TY: not on the flood risk listCO3 9UA: not on the flood risk listCO3 9UE: not on the flood risk listCO3 9UF: not on the flood risk listCO3 9UW: not on the flood risk listCO3 9UY: not on the flood risk listCO3 9UZ: not on the flood risk listCO3 9XA: not on the flood risk listCO3 9XB: not on the flood risk listCO3 9XE: not on the flood risk listCO3 9XF: not on the flood risk listCO3 9XG: not on the flood risk listCO3 9XH: not on the flood risk listCO3 9XJ: not on the flood risk listCO3 9XL: not on the flood risk listCO3 9XN: not on the flood risk listCO3 9XP: not on the flood risk listCO3 9XR: not on the flood risk listCO3 9XS: not on the flood risk listCO3 9XT: not on the flood risk listCO3 9XU: not on the flood risk listCO3 9XZ: not on the flood risk listCO3 4AZ: very low flood risk onlyCO3 0SL: low flood risk at worstCO3 3LG: low flood risk at worstCO3 3XL: low flood risk at worstCO3 3LD: medium flood risk at worstCO3 8NA: medium flood risk at worstCO3 8ND: medium flood risk at worstCO3 9SY: medium flood risk at worstCO3 3WG: high flood riskCO3 4AR: high flood riskCO3 8LU: high flood riskCO3 8NB: high flood riskCO3 9SX: high flood riskCO3 9TB: high flood riskCO3 9TF: high flood riskCO3 9TZ: high flood risk ColchesterBerechurch Map of every postcode in CO3, by flood risk Of the 864 postcodes in CO3 that ONS places, 8 have a home or business at high risk, 4 are at medium risk at worst, 4 are at low risk at worst, 1 are at very low risk only and 847 are not on the Environment Agency's at-risk list. Places named: Colchester, Berechurch. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. ColchesterBerechurch
  • A home or business at high risk: 8
  • At medium risk at worst: 4
  • At low risk at worst: 4
  • At very low risk only: 1
  • Not on the at-risk list: 847

Of the 864 postcodes in CO3 that ONS places, 8 have a home or business at high risk, 4 are at medium risk at worst, 4 are at low risk at worst, 1 are at very low risk only and 847 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. 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 51.8847, longitude 0.8555. 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.

CO3 4AR4 at high riskCO3 3WG2 at high riskCO3 9TZ2 at high riskCO3 8NB1 at high riskCO3 9TB1 at high riskCO3 9TF1 at high riskCO3 8LU1 at high riskCO3 9SX1 at high risk

What broadband can you get in CO3?

Ofcom reports on 855 of the 864 postcodes in CO3. At 673 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit673 of 855
Postcodes where every home can get superfast812 of 855

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 CO3 at risk of flooding?

17 of the 864 postcodes in CO3 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 48 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 17 of 864 postcodes High: 13Medium: 35Low: 106Very low: 1

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 CO3?

Homes in CO3 sold for a typical £350,000 in the 12 months to August 2026, across 429 sales, down 1.4% on the 12 months before, HM Land Registry's figures show.

£350,000 typical price, the 12 months to August 2026
12 months to August 2025
£355,000
12 months to August 2026
£350,000

▼ down 1.4% on the 12 months before

Detached£450,000 160 sales
Semi-detached£335,000 136 sales
Terraced£290,000 62 sales
Flat or maisonette£175,000 71 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 CO3

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

CO3 0203 postcodesCO3 3231 postcodesCO3 4182 postcodesCO3 8100 postcodesCO3 9148 postcodes
UK postcode format explained

Places in CO3

Towns and villages with postcodes in CO3, and how many each has here.

Colchester postcodes,801

Who covers CO3

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

  • Colchester524
  • Witham301
  • Harwich and North Essex39

Police force areas

  • Essex864

Next to CO3

CO2 postcode district CO4 postcode district All CO districts Colchester postcodes

"Next to" is by number: the districts before and after CO3 in the CO area.

Check a postcode

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