CM12 postcode district: Billericay and around, Essex

CM12 is a postcode district in Essex, with 507 postcodes in use in 3 sectors. It has postcodes in Billericay and Basildon. It is split between 2 councils: Basildon (505 postcodes) and Brentwood (2).

Postcodes in use
507
Sectors
3
Councils
2 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 CM12, by flood risk

Map of every postcode in CM12, by flood risk Of the 507 postcodes in CM12 that ONS places, 6 have a home or business at high risk, 2 are at medium risk at worst, 9 are at low risk at worst and 490 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: Billericay. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A127 CM12 0AA: not on the flood risk listCM12 0AB: not on the flood risk listCM12 0AD: not on the flood risk listCM12 0AE: not on the flood risk listCM12 0AG: not on the flood risk listCM12 0AH: not on the flood risk listCM12 0AJ: not on the flood risk listCM12 0AN: not on the flood risk listCM12 0AP: not on the flood risk listCM12 0AR: not on the flood risk listCM12 0AT: not on the flood risk listCM12 0AU: not on the flood risk listCM12 0AX: not on the flood risk listCM12 0AZ: not on the flood risk listCM12 0BA: not on the flood risk listCM12 0BB: not on the flood risk listCM12 0BD: not on the flood risk listCM12 0BE: not on the flood risk listCM12 0BG: not on the flood risk listCM12 0BH: not on the flood risk listCM12 0BP: not on the flood risk listCM12 0BQ: not on the flood risk listCM12 0BT: not on the flood risk listCM12 0BW: not on the flood risk listCM12 0BX: not on the flood risk listCM12 0BZ: not on the flood risk listCM12 0DD: not on the flood risk listCM12 0DG: not on the flood risk listCM12 0DN: not on the flood risk listCM12 0DP: not on the flood risk listCM12 0DR: not on the flood risk listCM12 0DS: not on the flood risk listCM12 0DT: not on the flood risk listCM12 0DU: not on the flood risk listCM12 0DW: not on the flood risk listCM12 0DX: not on the flood risk listCM12 0DY: not on the flood risk listCM12 0DZ: not on the flood risk listCM12 0EA: not on the flood risk listCM12 0ED: not on the flood risk listCM12 0EE: not on the flood risk listCM12 0EG: not on the flood risk listCM12 0EH: not on the flood risk listCM12 0EL: not on the flood risk listCM12 0EP: not on the flood risk listCM12 0EQ: not on the flood risk listCM12 0ES: not on the flood risk listCM12 0ET: not on the flood risk listCM12 0EU: not on the flood risk listCM12 0EX: not on the flood risk listCM12 0EZ: not on the flood risk listCM12 0FA: not on the flood risk listCM12 0FB: not on the flood risk listCM12 0FD: not on the flood risk listCM12 0FE: not on the flood risk listCM12 0FF: not on the flood risk listCM12 0FG: not on the flood risk listCM12 0FH: not on the flood risk listCM12 0FJ: not on the flood risk listCM12 0FL: not on the flood risk listCM12 0FN: not on the flood risk listCM12 0FP: not on the flood risk listCM12 0FQ: not on the flood risk listCM12 0FR: not on the flood risk listCM12 0FU: not on the flood risk listCM12 0GD: not on the flood risk listCM12 0GE: not on the flood risk listCM12 0GF: not on the flood risk listCM12 0GJ: not on the flood risk listCM12 0GP: not on the flood risk listCM12 0HA: not on the flood risk listCM12 0HB: not on the flood risk listCM12 0HD: not on the flood risk listCM12 0HE: not on the flood risk listCM12 0HG: not on the flood risk listCM12 0HH: not on the flood risk listCM12 0HJ: not on the flood risk listCM12 0HL: not on the flood risk listCM12 0HN: not on the flood risk listCM12 0HP: not on the flood risk listCM12 0HQ: not on the flood risk listCM12 0HR: not on the flood risk listCM12 0HS: not on the flood risk listCM12 0HT: not on the flood risk listCM12 0HU: not on the flood risk listCM12 0HX: not on the flood risk listCM12 0HZ: not on the flood risk listCM12 0JA: not on the flood risk listCM12 0JB: not on the flood risk listCM12 0JD: not on the flood risk listCM12 0JE: not on the flood risk listCM12 0JF: not on the flood risk listCM12 0JG: not on the flood risk listCM12 0JH: not on the flood risk listCM12 0JL: not on the flood risk listCM12 0JP: not on the flood risk listCM12 0JQ: not on the flood risk listCM12 0JR: not on the flood risk listCM12 0JS: not on the flood risk listCM12 0JT: not on the flood risk listCM12 0JU: not on the flood risk listCM12 0JX: not on the flood risk listCM12 0JY: not on the flood risk listCM12 0JZ: not on the flood risk listCM12 0LA: not on the flood risk listCM12 0LD: not on the flood risk listCM12 0LF: not on the flood risk listCM12 0LH: not on the flood risk listCM12 0LJ: not on the flood risk listCM12 0LL: not on the flood risk listCM12 0LP: not on the flood risk listCM12 0LR: not on the flood risk listCM12 0LS: not on the flood risk listCM12 0LX: not on the flood risk listCM12 0LZ: not on the flood risk listCM12 0NA: not on the flood risk listCM12 0NB: not on the flood risk listCM12 0ND: not on the flood risk listCM12 0NF: not on the flood risk listCM12 0NH: not on the flood risk listCM12 0NJ: not on the flood risk listCM12 0NN: not on the flood risk listCM12 0NP: not on the flood risk listCM12 0NR: not on the flood risk listCM12 0NS: not on the flood risk listCM12 0NT: not on the flood risk listCM12 0NU: not on the flood risk listCM12 0NX: not on the flood risk listCM12 0NZ: not on the flood risk listCM12 0PB: not on the flood risk listCM12 0PE: not on the flood risk listCM12 0PF: not on the flood risk listCM12 0PH: not on the flood risk listCM12 0PJ: not on the flood risk listCM12 0PL: not on the flood risk listCM12 0PP: not on the flood risk listCM12 0PR: not on the flood risk listCM12 0PS: not on the flood risk listCM12 0PT: not on the flood risk listCM12 0PU: not on the flood risk listCM12 0PX: not on the flood risk listCM12 0PZ: not on the flood risk listCM12 0QA: not on the flood risk listCM12 0QB: not on the flood risk listCM12 0QD: not on the flood risk listCM12 0QE: not on the flood risk listCM12 0QF: not on the flood risk listCM12 0QG: not on the flood risk listCM12 0QH: not on the flood risk listCM12 0QJ: not on the flood risk listCM12 0QL: not on the flood risk listCM12 0QN: not on the flood risk listCM12 0QP: not on the flood risk listCM12 0QR: not on the flood risk listCM12 0QS: not on the flood risk listCM12 0QT: not on the flood risk listCM12 0QU: not on the flood risk listCM12 0QW: not on the flood risk listCM12 0QX: not on the flood risk listCM12 0QZ: not on the flood risk listCM12 0RA: not on the flood risk listCM12 0RB: not on the flood risk listCM12 0RD: not on the flood risk listCM12 0RF: not on the flood risk listCM12 0RN: not on the flood risk listCM12 0RP: not on the flood risk listCM12 0RR: not on the flood risk listCM12 0RS: not on the flood risk listCM12 0RT: not on the flood risk listCM12 0RU: not on the flood risk listCM12 0RX: not on the flood risk listCM12 0SA: not on the flood risk listCM12 0SB: not on the flood risk listCM12 0SD: not on the flood risk listCM12 0SE: not on the flood risk listCM12 0SG: not on the flood risk listCM12 0SH: not on the flood risk listCM12 0SJ: not on the flood risk listCM12 0SN: not on the flood risk listCM12 0SP: not on the flood risk listCM12 0SR: not on the flood risk listCM12 0SS: not on the flood risk listCM12 0ST: not on the flood risk listCM12 0SU: not on the flood risk listCM12 0SX: not on the flood risk listCM12 0SY: not on the flood risk listCM12 0SZ: not on the flood risk listCM12 0TA: not on the flood risk listCM12 0TB: not on the flood risk listCM12 0TD: not on the flood risk listCM12 0TE: not on the flood risk listCM12 0TL: not on the flood risk listCM12 0TP: not on the flood risk listCM12 0TQ: not on the flood risk listCM12 0TX: not on the flood risk listCM12 0TY: not on the flood risk listCM12 0TZ: not on the flood risk listCM12 0UA: not on the flood risk listCM12 0UB: not on the flood risk listCM12 0UD: not on the flood risk listCM12 0UF: not on the flood risk listCM12 0UG: not on the flood risk listCM12 0UH: not on the flood risk listCM12 0UJ: not on the flood risk listCM12 0UL: not on the flood risk listCM12 0UN: not on the flood risk listCM12 0UP: not on the flood risk listCM12 0UQ: not on the flood risk listCM12 0UR: not on the flood risk listCM12 0UT: not on the flood risk listCM12 0UU: not on the flood risk listCM12 0UW: not on the flood risk listCM12 0XA: not on the flood risk listCM12 0XB: not on the flood risk listCM12 0XD: not on the flood risk listCM12 0XE: not on the flood risk listCM12 0XG: not on the flood risk listCM12 0XH: not on the flood risk listCM12 0XJ: not on the flood risk listCM12 0XL: not on the flood risk listCM12 0XN: not on the flood risk listCM12 0XP: not on the flood risk listCM12 0XQ: not on the flood risk listCM12 0XR: not on the flood risk listCM12 0XW: not on the flood risk listCM12 0XX: not on the flood risk listCM12 0XY: not on the flood risk listCM12 0XZ: not on the flood risk listCM12 0YA: not on the flood risk listCM12 0YB: not on the flood risk listCM12 0YE: not on the flood risk listCM12 0YF: not on the flood risk listCM12 0YG: not on the flood risk listCM12 0YH: not on the flood risk listCM12 0YJ: not on the flood risk listCM12 0YL: not on the flood risk listCM12 0YN: not on the flood risk listCM12 0YP: not on the flood risk listCM12 0YQ: not on the flood risk listCM12 0YR: not on the flood risk listCM12 0YS: not on the flood risk listCM12 0YW: not on the flood risk listCM12 0YX: not on the flood risk listCM12 0YZ: not on the flood risk listCM12 0ZE: not on the flood risk listCM12 9AB: not on the flood risk listCM12 9AD: not on the flood risk listCM12 9AH: not on the flood risk listCM12 9AJ: not on the flood risk listCM12 9AP: not on the flood risk listCM12 9AQ: not on the flood risk listCM12 9AS: not on the flood risk listCM12 9AX: not on the flood risk listCM12 9BA: not on the flood risk listCM12 9BE: not on the flood risk listCM12 9BG: not on the flood risk listCM12 9BQ: not on the flood risk listCM12 9BU: not on the flood risk listCM12 9BX: not on the flood risk listCM12 9BY: not on the flood risk listCM12 9DA: not on the flood risk listCM12 9DF: not on the flood risk listCM12 9DG: not on the flood risk listCM12 9DH: not on the flood risk listCM12 9DL: not on the flood risk listCM12 9DN: not on the flood risk listCM12 9DP: not on the flood risk listCM12 9DR: not on the flood risk listCM12 9DS: not on the flood risk listCM12 9DT: not on the flood risk listCM12 9DU: not on the flood risk listCM12 9DW: not on the flood risk listCM12 9DX: not on the flood risk listCM12 9DZ: not on the flood risk listCM12 9EA: not on the flood risk listCM12 9EB: not on the flood risk listCM12 9ED: not on the flood risk listCM12 9EE: not on the flood risk listCM12 9EF: not on the flood risk listCM12 9EG: not on the flood risk listCM12 9EH: not on the flood risk listCM12 9EL: not on the flood risk listCM12 9EQ: not on the flood risk listCM12 9ES: not on the flood risk listCM12 9ET: not on the flood risk listCM12 9EU: not on the flood risk listCM12 9EX: not on the flood risk listCM12 9FL: not on the flood risk listCM12 9FN: not on the flood risk listCM12 9FP: not on the flood risk listCM12 9FQ: not on the flood risk listCM12 9FR: not on the flood risk listCM12 9FS: not on the flood risk listCM12 9FU: not on the flood risk listCM12 9FX: not on the flood risk listCM12 9FY: not on the flood risk listCM12 9GE: not on the flood risk listCM12 9GQ: not on the flood risk listCM12 9GY: not on the flood risk listCM12 9HA: not on the flood risk listCM12 9HB: not on the flood risk listCM12 9HD: not on the flood risk listCM12 9HE: not on the flood risk listCM12 9HG: not on the flood risk listCM12 9HH: not on the flood risk listCM12 9HJ: not on the flood risk listCM12 9HL: not on the flood risk listCM12 9HP: not on the flood risk listCM12 9HQ: not on the flood risk listCM12 9HR: not on the flood risk listCM12 9HX: not on the flood risk listCM12 9HZ: not on the flood risk listCM12 9JA: not on the flood risk listCM12 9JB: not on the flood risk listCM12 9JD: not on the flood risk listCM12 9JE: not on the flood risk listCM12 9JF: not on the flood risk listCM12 9JG: not on the flood risk listCM12 9JH: not on the flood risk listCM12 9JJ: not on the flood risk listCM12 9JL: not on the flood risk listCM12 9JN: not on the flood risk listCM12 9JS: not on the flood risk listCM12 9JT: not on the flood risk listCM12 9JU: not on the flood risk listCM12 9JW: not on the flood risk listCM12 9JX: not on the flood risk listCM12 9JY: not on the flood risk listCM12 9JZ: not on the flood risk listCM12 9LB: not on the flood risk listCM12 9LD: not on the flood risk listCM12 9LE: not on the flood risk listCM12 9LF: not on the flood risk listCM12 9LG: not on the flood risk listCM12 9LH: not on the flood risk listCM12 9LJ: not on the flood risk listCM12 9LL: not on the flood risk listCM12 9LP: not on the flood risk listCM12 9LR: not on the flood risk listCM12 9LS: not on the flood risk listCM12 9LT: not on the flood risk listCM12 9LU: not on the flood risk listCM12 9LX: not on the flood risk listCM12 9LY: not on the flood risk listCM12 9NB: not on the flood risk listCM12 9ND: not on the flood risk listCM12 9NE: not on the flood risk listCM12 9NF: not on the flood risk listCM12 9NG: not on the flood risk listCM12 9NH: not on the flood risk listCM12 9NJ: not on the flood risk listCM12 9NL: not on the flood risk listCM12 9NN: not on the flood risk listCM12 9NP: not on the flood risk listCM12 9NR: not on the flood risk listCM12 9NS: not on the flood risk listCM12 9NT: not on the flood risk listCM12 9NU: not on the flood risk listCM12 9NW: not on the flood risk listCM12 9NX: not on the flood risk listCM12 9NZ: not on the flood risk listCM12 9PA: not on the flood risk listCM12 9PB: not on the flood risk listCM12 9PD: not on the flood risk listCM12 9PE: not on the flood risk listCM12 9PG: not on the flood risk listCM12 9PJ: not on the flood risk listCM12 9PL: not on the flood risk listCM12 9PN: not on the flood risk listCM12 9PP: not on the flood risk listCM12 9PQ: not on the flood risk listCM12 9PR: not on the flood risk listCM12 9PS: not on the flood risk listCM12 9PT: not on the flood risk listCM12 9PU: not on the flood risk listCM12 9PW: not on the flood risk listCM12 9PX: not on the flood risk listCM12 9PZ: not on the flood risk listCM12 9QB: not on the flood risk listCM12 9QF: not on the flood risk listCM12 9QG: not on the flood risk listCM12 9QH: not on the flood risk listCM12 9QJ: not on the flood risk listCM12 9QL: not on the flood risk listCM12 9QP: not on the flood risk listCM12 9QQ: not on the flood risk listCM12 9QR: not on the flood risk listCM12 9QS: not on the flood risk listCM12 9QT: not on the flood risk listCM12 9QU: not on the flood risk listCM12 9QW: not on the flood risk listCM12 9QX: not on the flood risk listCM12 9QY: not on the flood risk listCM12 9QZ: not on the flood risk listCM12 9RA: not on the flood risk listCM12 9RB: not on the flood risk listCM12 9RD: not on the flood risk listCM12 9RE: not on the flood risk listCM12 9RF: not on the flood risk listCM12 9RG: not on the flood risk listCM12 9RH: not on the flood risk listCM12 9RJ: not on the flood risk listCM12 9RN: not on the flood risk listCM12 9RR: not on the flood risk listCM12 9RU: not on the flood risk listCM12 9RW: not on the flood risk listCM12 9SA: not on the flood risk listCM12 9SB: not on the flood risk listCM12 9SD: not on the flood risk listCM12 9SE: not on the flood risk listCM12 9SG: not on the flood risk listCM12 9SJ: not on the flood risk listCM12 9SL: not on the flood risk listCM12 9SN: not on the flood risk listCM12 9SP: not on the flood risk listCM12 9SR: not on the flood risk listCM12 9SS: not on the flood risk listCM12 9ST: not on the flood risk listCM12 9SY: not on the flood risk listCM12 9TA: not on the flood risk listCM12 9TB: not on the flood risk listCM12 9TD: not on the flood risk listCM12 9TE: not on the flood risk listCM12 9TF: not on the flood risk listCM12 9TG: not on the flood risk listCM12 9TH: not on the flood risk listCM12 9TJ: not on the flood risk listCM12 9TL: not on the flood risk listCM12 9TN: not on the flood risk listCM12 9TP: not on the flood risk listCM12 9TR: not on the flood risk listCM12 9TS: not on the flood risk listCM12 9TY: not on the flood risk listCM12 9UG: not on the flood risk listCM12 9UH: not on the flood risk listCM12 9UJ: not on the flood risk listCM12 9UL: not on the flood risk listCM12 9UT: not on the flood risk listCM12 9UZ: not on the flood risk listCM12 9XA: not on the flood risk listCM12 9XB: not on the flood risk listCM12 9XE: not on the flood risk listCM12 9XG: not on the flood risk listCM12 9XH: not on the flood risk listCM12 9XY: not on the flood risk listCM12 9YE: not on the flood risk listCM12 9YF: not on the flood risk listCM12 0GG: low flood risk at worstCM12 0TN: low flood risk at worstCM12 0TS: low flood risk at worstCM12 9HT: low flood risk at worstCM12 9UA: low flood risk at worstCM12 9UN: low flood risk at worstCM12 9UP: low flood risk at worstCM12 9UR: low flood risk at worstCM12 9UX: low flood risk at worstCM12 9HS: medium flood risk at worstCM12 9TZ: medium flood risk at worstCM12 0ER: high flood riskCM12 0LE: high flood riskCM12 0LG: high flood riskCM12 0LN: high flood riskCM12 0LW: high flood riskCM12 9TT: high flood risk Billericay 5 postcodes at high or medium risk, outlined: this goes to CM12 0LW, the one with most homes and businesses at high risk5 postcodes at high or medium risk Map of every postcode in CM12, by flood risk Of the 507 postcodes in CM12 that ONS places, 6 have a home or business at high risk, 2 are at medium risk at worst, 9 are at low risk at worst and 490 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: Billericay. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. Billericay 5 postcodes at high or medium risk, outlined: this goes to CM12 0LW, the one with most homes and businesses at high risk5 postcodes at high or medium risk
  • A home or business at high risk: 6
  • At medium risk at worst: 2
  • At low risk at worst: 9
  • At very low risk only: 0
  • Not on the at-risk list: 490
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 507 postcodes in CM12 that ONS places, 6 have a home or business at high risk, 2 are at medium risk at worst, 9 are at low risk at worst and 490 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 160 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 51.6284, longitude 0.4144. 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.

CM12 0LW15 at high riskCM12 0LG9 at high riskCM12 0LN9 at high riskCM12 9TT5 at high riskCM12 0ER3 at high riskCM12 0LE1 at high risk

Where the postcodes at high or medium risk lie together

  • 5 postcodes at high or medium risk, outlined on the map. CM12 0LW, is the one with most homes and businesses at high risk.

What broadband can you get in CM12?

Ofcom reports on 488 of the 507 postcodes in CM12. At 371 of them every home and business can get gigabit broadband, and at 1 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit371 of 488
Postcodes where every home can get superfast466 of 488
Postcodes where some cannot get decent broadband1 of 488

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 CM12 at risk of flooding?

17 of the 507 postcodes in CM12 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 63 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 17 of 507 postcodes High: 42Medium: 21Low: 61Very low: 17

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 CM12?

Homes in CM12 sold for a typical £485,000 in the 12 months to August 2026, across 306 sales, down 1.5% on the 12 months before, HM Land Registry's figures show.

£485,000 typical price, the 12 months to August 2026
12 months to August 2025
£492,500
12 months to August 2026
£485,000

▼ down 1.5% on the 12 months before

Detached£695,000 109 sales
Semi-detached£470,000 112 sales
Terraced£375,000 41 sales
Flat or maisonette£265,000 44 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 CM12

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

CM12 0266 postcodesCM12 215 postcodesCM12 9226 postcodes
UK postcode format explained

Places in CM12

Towns and villages with postcodes in CM12, and how many each has here.

Billericay postcodes,452Basildon postcodes,6

Who covers CM12

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

  • Basildon and Billericay505
  • Brentwood and Ongar2

Police force areas

  • Essex507

Next to CM12

CM11 postcode district CM13 postcode district All CM districts Billericay postcodes

"Next to" is by number: the districts before and after CM12 in the CM area.

Check a postcode

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