SO51 postcode district: Romsey and around

SO51 is a postcode district mostly in Hampshire, with 881 postcodes in use in 7 sectors. It has postcodes in Romsey and Chandler's Ford. It is split between 4 councils: Test Valley (862 postcodes), New Forest (13), Winchester (4) and 1 other. 879 are in Hampshire. ONS lists no county for the other 2.

Postcodes in use
881
Sectors
7
Councils
4 councils
Places
2 places

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

Every postcode in SO51, by flood risk

Map of every postcode in SO51, by flood risk Of the 881 postcodes in SO51 that ONS places, 67 have a home or business at high risk, 20 are at medium risk at worst, 37 are at low risk at worst, 6 are at very low risk only and 751 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 34 postcodes at high or medium risk; 8 postcodes at high or medium risk. Places named: Romsey, North Baddesley, Rownhams. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. M27 SO51 0AA: not on the flood risk listSO51 0AB: not on the flood risk listSO51 0AD: not on the flood risk listSO51 0AF: not on the flood risk listSO51 0AG: not on the flood risk listSO51 0AL: not on the flood risk listSO51 0AN: not on the flood risk listSO51 0AP: not on the flood risk listSO51 0AR: not on the flood risk listSO51 0AS: not on the flood risk listSO51 0AT: not on the flood risk listSO51 0AW: not on the flood risk listSO51 0AX: not on the flood risk listSO51 0AY: not on the flood risk listSO51 0BA: not on the flood risk listSO51 0BB: not on the flood risk listSO51 0BD: not on the flood risk listSO51 0BF: not on the flood risk listSO51 0BG: not on the flood risk listSO51 0BH: not on the flood risk listSO51 0BJ: not on the flood risk listSO51 0BQ: not on the flood risk listSO51 0BS: not on the flood risk listSO51 0BX: not on the flood risk listSO51 0BY: not on the flood risk listSO51 0DF: not on the flood risk listSO51 0DG: not on the flood risk listSO51 0DH: not on the flood risk listSO51 0DN: not on the flood risk listSO51 0DQ: not on the flood risk listSO51 0DW: not on the flood risk listSO51 0DY: not on the flood risk listSO51 0DZ: not on the flood risk listSO51 0EE: not on the flood risk listSO51 0EF: not on the flood risk listSO51 0EJ: not on the flood risk listSO51 0EN: not on the flood risk listSO51 0EQ: not on the flood risk listSO51 0GB: not on the flood risk listSO51 0GD: not on the flood risk listSO51 0GE: not on the flood risk listSO51 0GF: not on the flood risk listSO51 0GG: not on the flood risk listSO51 0GH: not on the flood risk listSO51 0GJ: not on the flood risk listSO51 0GL: not on the flood risk listSO51 0GN: not on the flood risk listSO51 0GP: not on the flood risk listSO51 0GQ: not on the flood risk listSO51 0GR: not on the flood risk listSO51 0GS: not on the flood risk listSO51 0GY: not on the flood risk listSO51 0HD: not on the flood risk listSO51 0HF: not on the flood risk listSO51 0HG: not on the flood risk listSO51 0HH: not on the flood risk listSO51 0HJ: not on the flood risk listSO51 0HL: not on the flood risk listSO51 0HN: not on the flood risk listSO51 0HQ: not on the flood risk listSO51 0HS: not on the flood risk listSO51 0HT: not on the flood risk listSO51 0JB: not on the flood risk listSO51 0JD: not on the flood risk listSO51 0JE: not on the flood risk listSO51 0JL: not on the flood risk listSO51 0JN: not on the flood risk listSO51 0JP: not on the flood risk listSO51 0JQ: not on the flood risk listSO51 0JS: not on the flood risk listSO51 0JT: not on the flood risk listSO51 0JU: not on the flood risk listSO51 0JW: not on the flood risk listSO51 0JX: not on the flood risk listSO51 0LA: not on the flood risk listSO51 0LF: not on the flood risk listSO51 0LG: not on the flood risk listSO51 0LH: not on the flood risk listSO51 0LJ: not on the flood risk listSO51 0LL: not on the flood risk listSO51 0LP: not on the flood risk listSO51 0LQ: not on the flood risk listSO51 0LR: not on the flood risk listSO51 0LS: not on the flood risk listSO51 0LT: not on the flood risk listSO51 0LU: not on the flood risk listSO51 0LX: not on the flood risk listSO51 0LZ: not on the flood risk listSO51 0ND: not on the flood risk listSO51 0NF: not on the flood risk listSO51 0NG: not on the flood risk listSO51 0NH: not on the flood risk listSO51 0NJ: not on the flood risk listSO51 0NL: not on the flood risk listSO51 0NN: not on the flood risk listSO51 0NP: not on the flood risk listSO51 0NQ: not on the flood risk listSO51 0NR: not on the flood risk listSO51 0NS: not on the flood risk listSO51 0NT: not on the flood risk listSO51 0NU: not on the flood risk listSO51 0NW: not on the flood risk listSO51 0NX: not on the flood risk listSO51 0NY: not on the flood risk listSO51 0NZ: not on the flood risk listSO51 0PA: not on the flood risk listSO51 0PB: not on the flood risk listSO51 0PD: not on the flood risk listSO51 0PE: not on the flood risk listSO51 0PG: not on the flood risk listSO51 0PH: not on the flood risk listSO51 0PJ: not on the flood risk listSO51 0PL: not on the flood risk listSO51 0PN: not on the flood risk listSO51 0PP: not on the flood risk listSO51 0PQ: not on the flood risk listSO51 0PR: not on the flood risk listSO51 0PS: not on the flood risk listSO51 0PT: not on the flood risk listSO51 0PU: not on the flood risk listSO51 0PW: not on the flood risk listSO51 0PX: not on the flood risk listSO51 0PY: not on the flood risk listSO51 0QA: not on the flood risk listSO51 0QD: not on the flood risk listSO51 0QE: not on the flood risk listSO51 0QF: not on the flood risk listSO51 0QG: not on the flood risk listSO51 0QH: not on the flood risk listSO51 0QJ: not on the flood risk listSO51 0QL: not on the flood risk listSO51 0QN: not on the flood risk listSO51 0QP: not on the flood risk listSO51 0QR: not on the flood risk listSO51 0QS: not on the flood risk listSO51 0QT: not on the flood risk listSO51 0QU: not on the flood risk listSO51 0QW: not on the flood risk listSO51 0RA: not on the flood risk listSO51 0RG: not on the flood risk listSO51 0RJ: not on the flood risk listSO51 0SF: not on the flood risk listSO51 0ZN: not on the flood risk listSO51 5AE: not on the flood risk listSO51 5AX: not on the flood risk listSO51 5AY: not on the flood risk listSO51 5BE: not on the flood risk listSO51 5BF: not on the flood risk listSO51 5BG: not on the flood risk listSO51 5BJ: not on the flood risk listSO51 5BL: not on the flood risk listSO51 5HW: not on the flood risk listSO51 5HZ: not on the flood risk listSO51 5PG: not on the flood risk listSO51 5PH: not on the flood risk listSO51 5PP: not on the flood risk listSO51 5PQ: not on the flood risk listSO51 5PT: not on the flood risk listSO51 5PU: not on the flood risk listSO51 5PW: not on the flood risk listSO51 5QB: not on the flood risk listSO51 5QG: not on the flood risk listSO51 5QP: not on the flood risk listSO51 5QR: not on the flood risk listSO51 5QW: not on the flood risk listSO51 5QZ: not on the flood risk listSO51 5RD: not on the flood risk listSO51 5RG: not on the flood risk listSO51 5RP: not on the flood risk listSO51 5RR: not on the flood risk listSO51 5RS: not on the flood risk listSO51 5RT: not on the flood risk listSO51 5RX: not on the flood risk listSO51 5SA: not on the flood risk listSO51 5SB: not on the flood risk listSO51 5SE: not on the flood risk listSO51 5SG: not on the flood risk listSO51 5SJ: not on the flood risk listSO51 5SN: not on the flood risk listSO51 5ST: not on the flood risk listSO51 5SU: not on the flood risk listSO51 5SW: not on the flood risk listSO51 5SX: not on the flood risk listSO51 5SY: not on the flood risk listSO51 5UX: not on the flood risk listSO51 5UY: not on the flood risk listSO51 6AA: not on the flood risk listSO51 6AD: not on the flood risk listSO51 6AG: not on the flood risk listSO51 6AH: not on the flood risk listSO51 6AJ: not on the flood risk listSO51 6AQ: not on the flood risk listSO51 6AR: not on the flood risk listSO51 6AS: not on the flood risk listSO51 6AT: not on the flood risk listSO51 6AU: not on the flood risk listSO51 6AX: not on the flood risk listSO51 6AY: not on the flood risk listSO51 6AZ: not on the flood risk listSO51 6BB: not on the flood risk listSO51 6BD: not on the flood risk listSO51 6BE: not on the flood risk listSO51 6BH: not on the flood risk listSO51 6BJ: not on the flood risk listSO51 6BN: not on the flood risk listSO51 6BP: not on the flood risk listSO51 6BQ: not on the flood risk listSO51 6BR: not on the flood risk listSO51 6BS: not on the flood risk listSO51 6BT: not on the flood risk listSO51 6BW: not on the flood risk listSO51 6BX: not on the flood risk listSO51 6BY: not on the flood risk listSO51 6BZ: not on the flood risk listSO51 6DA: not on the flood risk listSO51 6DB: not on the flood risk listSO51 6DD: not on the flood risk listSO51 6DE: not on the flood risk listSO51 6DF: not on the flood risk listSO51 6DG: not on the flood risk listSO51 6DL: not on the flood risk listSO51 6DN: not on the flood risk listSO51 6DP: not on the flood risk listSO51 6DQ: not on the flood risk listSO51 6DS: not on the flood risk listSO51 6DT: not on the flood risk listSO51 6DU: not on the flood risk listSO51 6DX: not on the flood risk listSO51 6DY: not on the flood risk listSO51 6DZ: not on the flood risk listSO51 6EA: not on the flood risk listSO51 6EB: not on the flood risk listSO51 6EG: not on the flood risk listSO51 6EH: not on the flood risk listSO51 6EJ: not on the flood risk listSO51 6EL: not on the flood risk listSO51 6EN: not on the flood risk listSO51 6EQ: not on the flood risk listSO51 6ER: not on the flood risk listSO51 6ES: not on the flood risk listSO51 6EU: not on the flood risk listSO51 6EW: not on the flood risk listSO51 6EZ: not on the flood risk listSO51 6FA: not on the flood risk listSO51 6FB: not on the flood risk listSO51 6FD: not on the flood risk listSO51 6FE: not on the flood risk listSO51 6FF: not on the flood risk listSO51 6FG: not on the flood risk listSO51 6FH: not on the flood risk listSO51 6FJ: not on the flood risk listSO51 6FL: not on the flood risk listSO51 6FN: not on the flood risk listSO51 6FP: not on the flood risk listSO51 6FR: not on the flood risk listSO51 6FT: not on the flood risk listSO51 6FU: not on the flood risk listSO51 6FW: not on the flood risk listSO51 6FX: not on the flood risk listSO51 6FY: not on the flood risk listSO51 6FZ: not on the flood risk listSO51 6GA: not on the flood risk listSO51 6GB: not on the flood risk listSO51 6GD: not on the flood risk listSO51 6GE: not on the flood risk listSO51 6GF: not on the flood risk listSO51 6GG: not on the flood risk listSO51 6GJ: not on the flood risk listSO51 6GN: not on the flood risk listSO51 6GP: not on the flood risk listSO51 6GQ: not on the flood risk listSO51 6GR: not on the flood risk listSO51 6GS: not on the flood risk listSO51 6GU: not on the flood risk listSO51 6GW: not on the flood risk listSO51 6GY: not on the flood risk listSO51 6HA: not on the flood risk listSO51 6HB: not on the flood risk listSO51 6HE: not on the flood risk listSO51 6HH: not on the flood risk listSO51 6JR: not on the flood risk listSO51 6JS: not on the flood risk listSO51 6JT: not on the flood risk listSO51 6JU: not on the flood risk listSO51 6JW: not on the flood risk listSO51 6JX: not on the flood risk listSO51 6JY: not on the flood risk listSO51 6RA: not on the flood risk listSO51 6RB: not on the flood risk listSO51 6RF: not on the flood risk listSO51 6RG: not on the flood risk listSO51 6RH: not on the flood risk listSO51 6RJ: not on the flood risk listSO51 6RN: not on the flood risk listSO51 6RS: not on the flood risk listSO51 6ZA: not on the flood risk listSO51 6ZB: not on the flood risk listSO51 6ZE: not on the flood risk listSO51 6ZJ: not on the flood risk listSO51 6ZL: not on the flood risk listSO51 6ZR: not on the flood risk listSO51 7AA: not on the flood risk listSO51 7AB: not on the flood risk listSO51 7AE: not on the flood risk listSO51 7AF: not on the flood risk listSO51 7AG: not on the flood risk listSO51 7AH: not on the flood risk listSO51 7AJ: not on the flood risk listSO51 7AL: not on the flood risk listSO51 7AN: not on the flood risk listSO51 7DA: not on the flood risk listSO51 7DD: not on the flood risk listSO51 7HA: not on the flood risk listSO51 7HT: not on the flood risk listSO51 7HU: not on the flood risk listSO51 7HX: not on the flood risk listSO51 7JA: not on the flood risk listSO51 7JH: not on the flood risk listSO51 7JJ: not on the flood risk listSO51 7JL: not on the flood risk listSO51 7JN: not on the flood risk listSO51 7JQ: not on the flood risk listSO51 7JR: not on the flood risk listSO51 7JS: not on the flood risk listSO51 7JT: not on the flood risk listSO51 7JW: not on the flood risk listSO51 7JY: not on the flood risk listSO51 7JZ: not on the flood risk listSO51 7LA: not on the flood risk listSO51 7LD: not on the flood risk listSO51 7LF: not on the flood risk listSO51 7LG: not on the flood risk listSO51 7LL: not on the flood risk listSO51 7LQ: not on the flood risk listSO51 7LR: not on the flood risk listSO51 7LT: not on the flood risk listSO51 7LU: not on the flood risk listSO51 7LY: not on the flood risk listSO51 7NB: not on the flood risk listSO51 7NE: not on the flood risk listSO51 7NF: not on the flood risk listSO51 7NG: not on the flood risk listSO51 7NH: not on the flood risk listSO51 7NJ: not on the flood risk listSO51 7NN: not on the flood risk listSO51 7NP: not on the flood risk listSO51 7NQ: not on the flood risk listSO51 7NU: not on the flood risk listSO51 7NW: not on the flood risk listSO51 7NX: not on the flood risk listSO51 7NY: not on the flood risk listSO51 7NZ: not on the flood risk listSO51 7PB: not on the flood risk listSO51 7PE: not on the flood risk listSO51 7PG: not on the flood risk listSO51 7PL: not on the flood risk listSO51 7PN: not on the flood risk listSO51 7QE: not on the flood risk listSO51 7QH: not on the flood risk listSO51 7RA: not on the flood risk listSO51 7RG: not on the flood risk listSO51 7RH: not on the flood risk listSO51 7RN: not on the flood risk listSO51 7RP: not on the flood risk listSO51 7RQ: not on the flood risk listSO51 7RS: not on the flood risk listSO51 7RU: not on the flood risk listSO51 7RW: not on the flood risk listSO51 7SD: not on the flood risk listSO51 7TA: not on the flood risk listSO51 7TB: not on the flood risk listSO51 7TE: not on the flood risk listSO51 7TF: not on the flood risk listSO51 7TG: not on the flood risk listSO51 7TJ: not on the flood risk listSO51 7TN: not on the flood risk listSO51 7TP: not on the flood risk listSO51 7TR: not on the flood risk listSO51 7TS: not on the flood risk listSO51 7UA: not on the flood risk listSO51 7UD: not on the flood risk listSO51 7UF: not on the flood risk listSO51 7UN: not on the flood risk listSO51 7UQ: not on the flood risk listSO51 7US: not on the flood risk listSO51 7WB: not on the flood risk listSO51 7WF: not on the flood risk listSO51 7ZA: not on the flood risk listSO51 8AH: not on the flood risk listSO51 8AL: not on the flood risk listSO51 8AN: not on the flood risk listSO51 8BS: not on the flood risk listSO51 8BT: not on the flood risk listSO51 8BW: not on the flood risk listSO51 8DL: not on the flood risk listSO51 8DQ: not on the flood risk listSO51 8DT: not on the flood risk listSO51 8DU: not on the flood risk listSO51 8DW: not on the flood risk listSO51 8EF: not on the flood risk listSO51 8EJ: not on the flood risk listSO51 8EP: not on the flood risk listSO51 8EU: not on the flood risk listSO51 8FB: not on the flood risk listSO51 8FE: not on the flood risk listSO51 8FG: not on the flood risk listSO51 8FJ: not on the flood risk listSO51 8FN: not on the flood risk listSO51 8FR: not on the flood risk listSO51 8FS: not on the flood risk listSO51 8GJ: not on the flood risk listSO51 8GZ: not on the flood risk listSO51 8HA: not on the flood risk listSO51 8HY: not on the flood risk listSO51 8JG: not on the flood risk listSO51 8JS: not on the flood risk listSO51 8JU: not on the flood risk listSO51 8JX: not on the flood risk listSO51 8PA: not on the flood risk listSO51 8PB: not on the flood risk listSO51 8PN: not on the flood risk listSO51 8YB: not on the flood risk listSO51 9AA: not on the flood risk listSO51 9AF: not on the flood risk listSO51 9AG: not on the flood risk listSO51 9AL: not on the flood risk listSO51 9AQ: not on the flood risk listSO51 9AT: not on the flood risk listSO51 9AU: not on the flood risk listSO51 9AW: not on the flood risk listSO51 9AX: not on the flood risk listSO51 9AY: not on the flood risk listSO51 9BA: not on the flood risk listSO51 9BB: not on the flood risk listSO51 9BE: not on the flood risk listSO51 9BJ: not on the flood risk listSO51 9BL: not on the flood risk listSO51 9BP: not on the flood risk listSO51 9BQ: not on the flood risk listSO51 9BR: not on the flood risk listSO51 9BT: not on the flood risk listSO51 9BU: not on the flood risk listSO51 9BW: not on the flood risk listSO51 9BX: not on the flood risk listSO51 9BY: not on the flood risk listSO51 9BZ: not on the flood risk listSO51 9DA: not on the flood risk listSO51 9DB: not on the flood risk listSO51 9DD: not on the flood risk listSO51 9DE: not on the flood risk listSO51 9DF: not on the flood risk listSO51 9DG: not on the flood risk listSO51 9DH: not on the flood risk listSO51 9DJ: not on the flood risk listSO51 9DL: not on the flood risk listSO51 9DN: not on the flood risk listSO51 9LE: not on the flood risk listSO51 9LF: not on the flood risk listSO51 9LG: not on the flood risk listSO51 9LJ: not on the flood risk listSO51 9LL: not on the flood risk listSO51 9LN: not on the flood risk listSO51 9LP: not on the flood risk listSO51 9LQ: not on the flood risk listSO51 9NJ: not on the flood risk listSO51 9PA: not on the flood risk listSO51 9ZE: not on the flood risk listSO51 0AE: very low flood risk onlySO51 0LD: very low flood risk onlySO51 7LP: very low flood risk onlySO51 7SA: very low flood risk onlySO51 0GX: low flood risk at worstSO51 0HP: low flood risk at worstSO51 0JH: low flood risk at worstSO51 0NE: low flood risk at worstSO51 0QB: low flood risk at worstSO51 5AU: low flood risk at worstSO51 5BA: low flood risk at worstSO51 5UZ: low flood risk at worstSO51 6BA: low flood risk at worstSO51 6DH: low flood risk at worstSO51 6DR: low flood risk at worstSO51 6DW: low flood risk at worstSO51 6FS: low flood risk at worstSO51 6GL: low flood risk at worstSO51 7AD: low flood risk at worstSO51 7QT: low flood risk at worstSO51 7LX: low flood risk at worstSO51 7QU: low flood risk at worstSO51 8AE: low flood risk at worstSO51 8GD: low flood risk at worstSO51 8DY: low flood risk at worstSO51 8HB: low flood risk at worstSO51 8FH: low flood risk at worstSO51 8GP: low flood risk at worstSO51 8GX: low flood risk at worstSO51 8HD: low flood risk at worstSO51 8HN: low flood risk at worstSO51 8HQ: low flood risk at worstSO51 9AJ: low flood risk at worstSO51 0AJ: medium flood risk at worstSO51 0JA: medium flood risk at worstSO51 5AL: medium flood risk at worstSO51 6AF: medium flood risk at worstSO51 6AP: medium flood risk at worstSO51 6DJ: medium flood risk at worstSO51 6EF: medium flood risk at worstSO51 8AD: medium flood risk at worstSO51 8AF: medium flood risk at worstSO51 8HE: medium flood risk at worstSO51 8HG: medium flood risk at worstSO51 8HH: medium flood risk at worstSO51 8HL: medium flood risk at worstSO51 8LG: medium flood risk at worstSO51 9LH: medium flood risk at worstSO51 0DR: high flood riskSO51 0EZ: high flood riskSO51 0HA: high flood riskSO51 0HB: high flood riskSO51 0HE: high flood riskSO51 0HR: high flood riskSO51 0JF: high flood riskSO51 0JG: high flood riskSO51 0JJ: high flood riskSO51 0JR: high flood riskSO51 0LB: high flood riskSO51 0LE: high flood riskSO51 0LN: high flood riskSO51 0LW: high flood riskSO51 0NB: high flood riskSO51 0PF: high flood riskSO51 5AT: high flood riskSO51 5AS: high flood riskSO51 5AG: high flood riskSO51 5AH: high flood riskSO51 5AR: high flood riskSO51 5BN: high flood riskSO51 5BP: high flood riskSO51 6AB: high flood riskSO51 6AE: high flood riskSO51 6AL: high flood riskSO51 6AN: high flood riskSO51 6BG: high flood riskSO51 6EE: high flood riskSO51 6EP: high flood riskSO51 6FQ: high flood riskSO51 8JE: high flood riskSO51 7LE: high flood riskSO51 8AA: high flood riskSO51 8AB: high flood riskSO51 8AJ: high flood riskSO51 8BX: high flood riskSO51 8BY: high flood riskSO51 8ES: high flood riskSO51 8EQ: high flood riskSO51 8ER: high flood riskSO51 8GE: high flood riskSO51 8GF: high flood riskSO51 8GQ: high flood riskSO51 8HF: high flood riskSO51 8JA: high flood riskSO51 8JD: high flood riskSO51 8PD: high flood riskSO51 8PE: high flood riskSO51 8WJ: high flood riskSO51 9AN: high flood riskSO51 9BD: high flood riskSO51 9BN: high flood riskSO51 9LA: high flood riskSO51 9LB: high flood riskSO51 9ZH: high flood risk RomseyNorth BaddesleyRownhams 34 postcodes at high or medium risk, outlined: this goes to SO51 8JA, the one with most homes and businesses at high risk34 postcodes at high or medium risk8 postcodes at high or medium risk, outlined: this goes to SO51 8LZ, the one with most homes and businesses at high risk8 postcodes at high or medium risk Map of every postcode in SO51, by flood risk Of the 881 postcodes in SO51 that ONS places, 67 have a home or business at high risk, 20 are at medium risk at worst, 37 are at low risk at worst, 6 are at very low risk only and 751 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 34 postcodes at high or medium risk; 8 postcodes at high or medium risk. Places named: Romsey, Rownhams. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2.5 km. RomseyRownhams 8 postcodes at high or medium risk, outlined: this goes to SO51 8LZ, the one with most homes and businesses at high risk8 postcodes at high or medium risk
  • A home or business at high risk: 67
  • At medium risk at worst: 20
  • At low risk at worst: 37
  • At very low risk only: 6
  • Not on the at-risk list: 751
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 881 postcodes in SO51 that ONS places, 67 have a home or business at high risk, 20 are at medium risk at worst, 37 are at low risk at worst, 6 are at very low risk only and 751 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 180 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 50.9961, longitude -1.5036. 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

67 postcodes here have a home or business at high risk. These are the 12 with the most homes and businesses at that risk.

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

SO51 8LZ35 at high riskSO51 8JA22 at high riskSO51 5BQ20 at high riskSO51 8JD16 at high riskSO51 8JB15 at high riskSO51 8BZ13 at high riskSO51 0EZ12 at high riskSO51 0HB11 at high riskSO51 8AA11 at high riskSO51 5AP11 at high riskSO51 8GG10 at high riskSO51 0HA9 at high risk

Where the postcodes at high or medium risk lie together

  • 34 postcodes at high or medium risk, outlined on the map. SO51 8JA, is the one with most homes and businesses at high risk.
  • 8 postcodes at high or medium risk, outlined on the map. SO51 8LZ, is the one with most homes and businesses at high risk.

What broadband can you get in SO51?

Ofcom reports on 850 of the 881 postcodes in SO51. At 443 of them every home and business can get gigabit broadband, and at 14 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit443 of 850
Postcodes where every home can get superfast670 of 850
Postcodes where some cannot get decent broadband14 of 850

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 SO51 at risk of flooding?

130 of the 881 postcodes in SO51 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 578 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 130 of 881 postcodes High: 337Medium: 241Low: 632Very low: 53

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 SO51?

Homes in SO51 sold for a typical £410,000 in the 12 months to August 2026, across 379 sales, down 2.4% on the 12 months before, HM Land Registry's figures show.

£410,000 typical price, the 12 months to August 2026
£420,000 12 months to August 2025
▼ down 2.4% on the 12 months before
  • Detached £665,000 133 sales
  • Semi-detached £402,500 82 sales
  • Terraced £320,000 105 sales
  • Flat or maisonette £215,000 59 sales

Each bar is that kind's typical price, against the most expensive kind here.

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 SO51

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

SO51 0203 postcodesSO51 117 postcodesSO51 5109 postcodesSO51 6149 postcodesSO51 7160 postcodesSO51 8179 postcodesSO51 964 postcodes
UK postcode format explained

Places in SO51

Towns and villages with postcodes in SO51, and how many each has here.

Romsey postcodes,541Chandler's Ford postcodes,3

Who covers SO51

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

  • Romsey and Southampton North862
  • New Forest East13
  • Winchester4
  • Salisbury2

Police force areas

  • Hampshire879
  • Wiltshire2

Next to SO51

SO50 postcode district SO52 postcode district All SO districts Romsey postcodes

"Next to" is by number: the districts before and after SO51 in the SO area.

Check a postcode

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