CM11 postcode district: Billericay and around, Essex

CM11 is a postcode district in Essex, with 453 postcodes in use in 2 sectors. It has postcodes in Billericay, Wickford and Basildon. It is split between 2 councils: Basildon (373 postcodes) and Chelmsford (80).

Postcodes in use
453
Sectors
2
Councils
2 councils
Places
3 places

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

Every postcode in CM11, by flood risk

Map of every postcode in CM11, by flood risk Of the 453 postcodes in CM11 that ONS places, 5 have a home or business at high risk, 1 are at medium risk at worst, 6 are at low risk at worst, 2 are at very low risk only and 439 are not on the Environment Agency's at-risk list. Places named: Billericay. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A127A176 CM11 1AA: not on the flood risk listCM11 1AB: not on the flood risk listCM11 1AE: not on the flood risk listCM11 1AF: not on the flood risk listCM11 1AG: not on the flood risk listCM11 1AH: not on the flood risk listCM11 1AJ: not on the flood risk listCM11 1AL: not on the flood risk listCM11 1AN: not on the flood risk listCM11 1AP: not on the flood risk listCM11 1AQ: not on the flood risk listCM11 1AS: not on the flood risk listCM11 1AT: not on the flood risk listCM11 1AU: not on the flood risk listCM11 1BA: not on the flood risk listCM11 1BB: not on the flood risk listCM11 1BG: not on the flood risk listCM11 1BH: not on the flood risk listCM11 1BJ: not on the flood risk listCM11 1BL: not on the flood risk listCM11 1BN: not on the flood risk listCM11 1BP: not on the flood risk listCM11 1BS: not on the flood risk listCM11 1BT: not on the flood risk listCM11 1BU: not on the flood risk listCM11 1BY: not on the flood risk listCM11 1BZ: not on the flood risk listCM11 1DB: not on the flood risk listCM11 1DD: not on the flood risk listCM11 1DE: not on the flood risk listCM11 1DF: not on the flood risk listCM11 1DG: not on the flood risk listCM11 1DH: not on the flood risk listCM11 1DJ: not on the flood risk listCM11 1DL: not on the flood risk listCM11 1DP: not on the flood risk listCM11 1DQ: not on the flood risk listCM11 1DR: not on the flood risk listCM11 1DS: not on the flood risk listCM11 1DT: not on the flood risk listCM11 1DU: not on the flood risk listCM11 1DX: not on the flood risk listCM11 1DY: not on the flood risk listCM11 1DZ: not on the flood risk listCM11 1EA: not on the flood risk listCM11 1EB: not on the flood risk listCM11 1ED: not on the flood risk listCM11 1EE: not on the flood risk listCM11 1EF: not on the flood risk listCM11 1EG: not on the flood risk listCM11 1EH: not on the flood risk listCM11 1EJ: not on the flood risk listCM11 1EL: not on the flood risk listCM11 1EN: not on the flood risk listCM11 1EP: not on the flood risk listCM11 1ER: not on the flood risk listCM11 1ES: not on the flood risk listCM11 1ET: not on the flood risk listCM11 1EU: not on the flood risk listCM11 1EX: not on the flood risk listCM11 1EY: not on the flood risk listCM11 1EZ: not on the flood risk listCM11 1FA: not on the flood risk listCM11 1FB: not on the flood risk listCM11 1GG: not on the flood risk listCM11 1HB: not on the flood risk listCM11 1HD: not on the flood risk listCM11 1HE: not on the flood risk listCM11 1HG: not on the flood risk listCM11 1HH: not on the flood risk listCM11 1HJ: not on the flood risk listCM11 1HL: not on the flood risk listCM11 1HN: not on the flood risk listCM11 1HP: not on the flood risk listCM11 1HQ: not on the flood risk listCM11 1HR: not on the flood risk listCM11 1HS: not on the flood risk listCM11 1HU: not on the flood risk listCM11 1HX: not on the flood risk listCM11 1HY: not on the flood risk listCM11 1HZ: not on the flood risk listCM11 1JA: not on the flood risk listCM11 1JB: not on the flood risk listCM11 1JD: not on the flood risk listCM11 1JE: not on the flood risk listCM11 1JF: not on the flood risk listCM11 1JG: not on the flood risk listCM11 1JH: not on the flood risk listCM11 1JJ: not on the flood risk listCM11 1JL: not on the flood risk listCM11 1JN: not on the flood risk listCM11 1JR: not on the flood risk listCM11 1JS: not on the flood risk listCM11 1JY: not on the flood risk listCM11 1JZ: not on the flood risk listCM11 1LA: not on the flood risk listCM11 1LB: not on the flood risk listCM11 1LD: not on the flood risk listCM11 1LE: not on the flood risk listCM11 1LG: not on the flood risk listCM11 1LH: not on the flood risk listCM11 1LJ: not on the flood risk listCM11 1LN: not on the flood risk listCM11 1LP: not on the flood risk listCM11 1LQ: not on the flood risk listCM11 1LR: not on the flood risk listCM11 1LS: not on the flood risk listCM11 1LT: not on the flood risk listCM11 1LU: not on the flood risk listCM11 1LW: not on the flood risk listCM11 1LX: not on the flood risk listCM11 1LY: not on the flood risk listCM11 1LZ: not on the flood risk listCM11 1NA: not on the flood risk listCM11 1NB: not on the flood risk listCM11 1ND: not on the flood risk listCM11 1NE: not on the flood risk listCM11 1NF: not on the flood risk listCM11 1NH: not on the flood risk listCM11 1NJ: not on the flood risk listCM11 1NL: not on the flood risk listCM11 1NN: not on the flood risk listCM11 1NP: not on the flood risk listCM11 1NQ: not on the flood risk listCM11 1NR: not on the flood risk listCM11 1NS: not on the flood risk listCM11 1NU: not on the flood risk listCM11 1NX: not on the flood risk listCM11 1NZ: not on the flood risk listCM11 1PA: not on the flood risk listCM11 1PB: not on the flood risk listCM11 1PH: not on the flood risk listCM11 1PJ: not on the flood risk listCM11 1PL: not on the flood risk listCM11 1PP: not on the flood risk listCM11 1PQ: not on the flood risk listCM11 1PR: not on the flood risk listCM11 1PS: not on the flood risk listCM11 1PT: not on the flood risk listCM11 1PU: not on the flood risk listCM11 1PW: not on the flood risk listCM11 1PZ: not on the flood risk listCM11 1QA: not on the flood risk listCM11 1QB: not on the flood risk listCM11 1QD: not on the flood risk listCM11 1QE: not on the flood risk listCM11 1QF: not on the flood risk listCM11 1QH: not on the flood risk listCM11 1QL: not on the flood risk listCM11 1QN: not on the flood risk listCM11 1QP: not on the flood risk listCM11 1QQ: not on the flood risk listCM11 1QR: not on the flood risk listCM11 1QS: not on the flood risk listCM11 1QU: not on the flood risk listCM11 1QY: not on the flood risk listCM11 1QZ: not on the flood risk listCM11 1RG: not on the flood risk listCM11 1RH: not on the flood risk listCM11 1RJ: not on the flood risk listCM11 1RL: not on the flood risk listCM11 1RN: not on the flood risk listCM11 1RP: not on the flood risk listCM11 1RR: not on the flood risk listCM11 1RT: not on the flood risk listCM11 1SA: not on the flood risk listCM11 1SB: not on the flood risk listCM11 1SD: not on the flood risk listCM11 1SE: not on the flood risk listCM11 1SF: not on the flood risk listCM11 1SG: not on the flood risk listCM11 1SH: not on the flood risk listCM11 1SJ: not on the flood risk listCM11 1SQ: not on the flood risk listCM11 1SX: not on the flood risk listCM11 1SZ: not on the flood risk listCM11 1WT: not on the flood risk listCM11 1WW: not on the flood risk listCM11 2AA: not on the flood risk listCM11 2AD: not on the flood risk listCM11 2AE: not on the flood risk listCM11 2AG: not on the flood risk listCM11 2AH: not on the flood risk listCM11 2AJ: not on the flood risk listCM11 2AL: not on the flood risk listCM11 2AN: not on the flood risk listCM11 2AP: not on the flood risk listCM11 2AS: not on the flood risk listCM11 2AT: not on the flood risk listCM11 2AU: not on the flood risk listCM11 2AW: not on the flood risk listCM11 2AX: not on the flood risk listCM11 2AZ: not on the flood risk listCM11 2BA: not on the flood risk listCM11 2BB: not on the flood risk listCM11 2BD: not on the flood risk listCM11 2BE: not on the flood risk listCM11 2BG: not on the flood risk listCM11 2BH: not on the flood risk listCM11 2BJ: not on the flood risk listCM11 2BL: not on the flood risk listCM11 2BN: not on the flood risk listCM11 2BP: not on the flood risk listCM11 2BS: not on the flood risk listCM11 2BT: not on the flood risk listCM11 2BU: not on the flood risk listCM11 2BX: not on the flood risk listCM11 2BY: not on the flood risk listCM11 2BZ: not on the flood risk listCM11 2DA: not on the flood risk listCM11 2DB: not on the flood risk listCM11 2DF: not on the flood risk listCM11 2DG: not on the flood risk listCM11 2DH: not on the flood risk listCM11 2DJ: not on the flood risk listCM11 2DL: not on the flood risk listCM11 2DP: not on the flood risk listCM11 2DR: not on the flood risk listCM11 2DS: not on the flood risk listCM11 2DT: not on the flood risk listCM11 2DU: not on the flood risk listCM11 2DX: not on the flood risk listCM11 2DZ: not on the flood risk listCM11 2EA: not on the flood risk listCM11 2EB: not on the flood risk listCM11 2ED: not on the flood risk listCM11 2EE: not on the flood risk listCM11 2EF: not on the flood risk listCM11 2EG: not on the flood risk listCM11 2EH: not on the flood risk listCM11 2EN: not on the flood risk listCM11 2EP: not on the flood risk listCM11 2ER: not on the flood risk listCM11 2EU: not on the flood risk listCM11 2EX: not on the flood risk listCM11 2EZ: not on the flood risk listCM11 2FE: not on the flood risk listCM11 2FF: not on the flood risk listCM11 2FG: not on the flood risk listCM11 2FH: not on the flood risk listCM11 2FP: not on the flood risk listCM11 2HA: not on the flood risk listCM11 2HB: not on the flood risk listCM11 2HG: not on the flood risk listCM11 2HH: not on the flood risk listCM11 2HJ: not on the flood risk listCM11 2HL: not on the flood risk listCM11 2HN: not on the flood risk listCM11 2HR: not on the flood risk listCM11 2HS: not on the flood risk listCM11 2HT: not on the flood risk listCM11 2HU: not on the flood risk listCM11 2HW: not on the flood risk listCM11 2HZ: not on the flood risk listCM11 2JB: not on the flood risk listCM11 2JE: not on the flood risk listCM11 2JG: not on the flood risk listCM11 2JH: not on the flood risk listCM11 2JJ: not on the flood risk listCM11 2JL: not on the flood risk listCM11 2JN: not on the flood risk listCM11 2JP: not on the flood risk listCM11 2JQ: not on the flood risk listCM11 2JT: not on the flood risk listCM11 2JU: not on the flood risk listCM11 2JW: not on the flood risk listCM11 2JX: not on the flood risk listCM11 2JZ: not on the flood risk listCM11 2LA: not on the flood risk listCM11 2LB: not on the flood risk listCM11 2LD: not on the flood risk listCM11 2LE: not on the flood risk listCM11 2LG: not on the flood risk listCM11 2LH: not on the flood risk listCM11 2LJ: not on the flood risk listCM11 2LN: not on the flood risk listCM11 2LP: not on the flood risk listCM11 2LR: not on the flood risk listCM11 2LS: not on the flood risk listCM11 2LT: not on the flood risk listCM11 2LU: not on the flood risk listCM11 2LX: not on the flood risk listCM11 2LY: not on the flood risk listCM11 2LZ: not on the flood risk listCM11 2NA: not on the flood risk listCM11 2NB: not on the flood risk listCM11 2ND: not on the flood risk listCM11 2NF: not on the flood risk listCM11 2NG: not on the flood risk listCM11 2NH: not on the flood risk listCM11 2NJ: not on the flood risk listCM11 2NL: not on the flood risk listCM11 2NN: not on the flood risk listCM11 2NP: not on the flood risk listCM11 2NQ: not on the flood risk listCM11 2NR: not on the flood risk listCM11 2NT: not on the flood risk listCM11 2NU: not on the flood risk listCM11 2NX: not on the flood risk listCM11 2NY: not on the flood risk listCM11 2NZ: not on the flood risk listCM11 2PA: not on the flood risk listCM11 2PB: not on the flood risk listCM11 2PD: not on the flood risk listCM11 2PE: not on the flood risk listCM11 2PF: not on the flood risk listCM11 2PG: not on the flood risk listCM11 2PH: not on the flood risk listCM11 2PJ: not on the flood risk listCM11 2PL: not on the flood risk listCM11 2PN: not on the flood risk listCM11 2PP: not on the flood risk listCM11 2PQ: not on the flood risk listCM11 2PR: not on the flood risk listCM11 2PS: not on the flood risk listCM11 2PZ: not on the flood risk listCM11 2QA: not on the flood risk listCM11 2QB: not on the flood risk listCM11 2QD: not on the flood risk listCM11 2QE: not on the flood risk listCM11 2QF: not on the flood risk listCM11 2QG: not on the flood risk listCM11 2QJ: not on the flood risk listCM11 2QN: not on the flood risk listCM11 2QP: not on the flood risk listCM11 2QR: not on the flood risk listCM11 2QS: not on the flood risk listCM11 2QW: not on the flood risk listCM11 2RA: not on the flood risk listCM11 2RB: not on the flood risk listCM11 2RE: not on the flood risk listCM11 2RG: not on the flood risk listCM11 2RH: not on the flood risk listCM11 2RJ: not on the flood risk listCM11 2RL: not on the flood risk listCM11 2RN: not on the flood risk listCM11 2RP: not on the flood risk listCM11 2RQ: not on the flood risk listCM11 2RR: not on the flood risk listCM11 2RS: not on the flood risk listCM11 2RT: not on the flood risk listCM11 2RU: not on the flood risk listCM11 2RX: not on the flood risk listCM11 2RY: not on the flood risk listCM11 2RZ: not on the flood risk listCM11 2SA: not on the flood risk listCM11 2SB: not on the flood risk listCM11 2SD: not on the flood risk listCM11 2SE: not on the flood risk listCM11 2SF: not on the flood risk listCM11 2SG: not on the flood risk listCM11 2SH: not on the flood risk listCM11 2SL: not on the flood risk listCM11 2SN: not on the flood risk listCM11 2ST: not on the flood risk listCM11 2SU: not on the flood risk listCM11 2SW: not on the flood risk listCM11 2SX: not on the flood risk listCM11 2SY: not on the flood risk listCM11 2SZ: not on the flood risk listCM11 2TA: not on the flood risk listCM11 2TB: not on the flood risk listCM11 2TD: not on the flood risk listCM11 2TE: not on the flood risk listCM11 2TF: not on the flood risk listCM11 2TG: not on the flood risk listCM11 2TH: not on the flood risk listCM11 2TJ: not on the flood risk listCM11 2TN: not on the flood risk listCM11 2TP: not on the flood risk listCM11 2TQ: not on the flood risk listCM11 2TR: not on the flood risk listCM11 2TS: not on the flood risk listCM11 2TW: not on the flood risk listCM11 2TY: not on the flood risk listCM11 2TZ: not on the flood risk listCM11 2UA: not on the flood risk listCM11 2UB: not on the flood risk listCM11 2UD: not on the flood risk listCM11 2UL: not on the flood risk listCM11 2UP: not on the flood risk listCM11 2UQ: not on the flood risk listCM11 2UR: not on the flood risk listCM11 2UT: not on the flood risk listCM11 2UX: not on the flood risk listCM11 2UY: not on the flood risk listCM11 2UZ: not on the flood risk listCM11 2XA: not on the flood risk listCM11 2XB: not on the flood risk listCM11 2XD: not on the flood risk listCM11 2XE: not on the flood risk listCM11 2XF: not on the flood risk listCM11 2XG: not on the flood risk listCM11 2XH: not on the flood risk listCM11 2XJ: not on the flood risk listCM11 2XL: not on the flood risk listCM11 2XN: not on the flood risk listCM11 2XP: not on the flood risk listCM11 2XR: not on the flood risk listCM11 2XS: not on the flood risk listCM11 2XT: not on the flood risk listCM11 2XU: not on the flood risk listCM11 2XY: not on the flood risk listCM11 2XZ: not on the flood risk listCM11 2YA: not on the flood risk listCM11 2YB: not on the flood risk listCM11 2YD: not on the flood risk listCM11 2YE: not on the flood risk listCM11 2YF: not on the flood risk listCM11 2YH: not on the flood risk listCM11 2YJ: not on the flood risk listCM11 2YL: not on the flood risk listCM11 2YN: not on the flood risk listCM11 2YP: not on the flood risk listCM11 2YQ: not on the flood risk listCM11 2YR: not on the flood risk listCM11 2YS: not on the flood risk listCM11 2YT: not on the flood risk listCM11 2YU: not on the flood risk listCM11 2YW: not on the flood risk listCM11 2YX: not on the flood risk listCM11 2YY: not on the flood risk listCM11 2YZ: not on the flood risk listCM11 2ZD: not on the flood risk listCM11 2UF: very low flood risk onlyCM11 2ET: low flood risk at worstCM11 2FA: low flood risk at worstCM11 2FD: low flood risk at worstCM11 2TX: low flood risk at worstCM11 2UJ: low flood risk at worstCM11 2YG: low flood risk at worstCM11 2JS: medium flood risk at worstCM11 2HQ: high flood riskCM11 2JF: high flood riskCM11 2JR: high flood riskCM11 2UH: high flood riskCM11 2UN: high flood risk Billericay Map of every postcode in CM11, by flood risk Of the 453 postcodes in CM11 that ONS places, 5 have a home or business at high risk, 1 are at medium risk at worst, 6 are at low risk at worst, 2 are at very low risk only and 439 are not on the Environment Agency's at-risk list. Places named: Billericay. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A127 Billericay
  • A home or business at high risk: 5
  • At medium risk at worst: 1
  • At low risk at worst: 6
  • At very low risk only: 2
  • Not on the at-risk list: 439

Of the 453 postcodes in CM11 that ONS places, 5 have a home or business at high risk, 1 are at medium risk at worst, 6 are at low risk at worst, 2 are at very low risk only and 439 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 51.6233, longitude 0.4463. 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.

CM11 2UN3 at high riskCM11 2JF3 at high riskCM11 2HQ2 at high riskCM11 2JR1 at high riskCM11 2UH1 at high risk

What broadband can you get in CM11?

Ofcom reports on 444 of the 453 postcodes in CM11. At 301 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 gigabit301 of 444
Postcodes where every home can get superfast396 of 444
Postcodes where some cannot get decent broadband1 of 444

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 CM11 at risk of flooding?

14 of the 453 postcodes in CM11 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 25 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 14 of 453 postcodes High: 10Medium: 15Low: 66Very low: 21

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 CM11?

Homes in CM11 sold for a typical £475,000 in the 12 months to August 2026, across 212 sales, down 3.1% on the 12 months before, HM Land Registry's figures show.

£475,000 typical price, the 12 months to August 2026
£490,000 12 months to August 2025
▼ down 3.1% on the 12 months before
  • Detached £747,500 76 sales
  • Semi-detached £460,000 86 sales
  • Terraced £405,000 38 sales
  • Flat or maisonette £202,250 12 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 CM11

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

CM11 1181 postcodesCM11 2272 postcodes
UK postcode format explained

Places in CM11

Towns and villages with postcodes in CM11, and how many each has here.

Billericay postcodes,307Wickford postcodes,4Basildon postcodes,2

Who covers CM11

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 Billericay373
  • Maldon80

Police force areas

  • Essex453

Next to CM11

CM9 postcode district CM12 postcode district All CM districts Billericay postcodes

"Next to" is by number: the districts before and after CM11 in the CM area.

Check a postcode

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