CM21 postcode district: Sawbridgeworth and around

CM21 is a postcode district mostly in Hertfordshire, with 319 postcodes in use in 3 sectors. It has postcodes in Sawbridgeworth. It is split between 2 councils: East Hertfordshire (274 postcodes) and Epping Forest (45). 274 are in Hertfordshire and 45 in Essex.

Postcodes in use
319
Sectors
3
Councils
2 councils
Places
Sawbridgeworth

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

Every postcode in CM21, by flood risk

Map of every postcode in CM21, by flood risk Of the 319 postcodes in CM21 that ONS places, 14 have a home or business at high risk, 4 are at medium risk at worst, 9 are at low risk at worst and 292 are not on the Environment Agency's at-risk list. Places named: Sawbridgeworth. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. CM21 0AA: not on the flood risk listCM21 0AB: not on the flood risk listCM21 0AD: not on the flood risk listCM21 0AE: not on the flood risk listCM21 0AF: not on the flood risk listCM21 0AH: not on the flood risk listCM21 0AJ: not on the flood risk listCM21 0AL: not on the flood risk listCM21 0AN: not on the flood risk listCM21 0AP: not on the flood risk listCM21 0AQ: not on the flood risk listCM21 0AR: not on the flood risk listCM21 0AS: not on the flood risk listCM21 0AT: not on the flood risk listCM21 0AX: not on the flood risk listCM21 0AY: not on the flood risk listCM21 0AZ: not on the flood risk listCM21 0BB: not on the flood risk listCM21 0BD: not on the flood risk listCM21 0BE: not on the flood risk listCM21 0BJ: not on the flood risk listCM21 0BL: not on the flood risk listCM21 0BN: not on the flood risk listCM21 0BP: not on the flood risk listCM21 0BS: not on the flood risk listCM21 0BT: not on the flood risk listCM21 0BU: not on the flood risk listCM21 0BX: not on the flood risk listCM21 0BY: not on the flood risk listCM21 0BZ: not on the flood risk listCM21 0DA: not on the flood risk listCM21 0DB: not on the flood risk listCM21 0DD: not on the flood risk listCM21 0DE: not on the flood risk listCM21 0DF: not on the flood risk listCM21 0DH: not on the flood risk listCM21 0DJ: not on the flood risk listCM21 0DN: not on the flood risk listCM21 0DQ: not on the flood risk listCM21 0DR: not on the flood risk listCM21 0DS: not on the flood risk listCM21 0DT: not on the flood risk listCM21 0DU: not on the flood risk listCM21 0DW: not on the flood risk listCM21 0DY: not on the flood risk listCM21 0DZ: not on the flood risk listCM21 0EA: not on the flood risk listCM21 0EB: not on the flood risk listCM21 0ED: not on the flood risk listCM21 0EE: not on the flood risk listCM21 0EF: not on the flood risk listCM21 0EG: not on the flood risk listCM21 0EH: not on the flood risk listCM21 0EJ: not on the flood risk listCM21 0EL: not on the flood risk listCM21 0EN: not on the flood risk listCM21 0EP: not on the flood risk listCM21 0ER: not on the flood risk listCM21 0ES: not on the flood risk listCM21 0ET: not on the flood risk listCM21 0EU: not on the flood risk listCM21 0EW: not on the flood risk listCM21 0EY: not on the flood risk listCM21 0EZ: not on the flood risk listCM21 0FA: not on the flood risk listCM21 0FB: not on the flood risk listCM21 0FD: not on the flood risk listCM21 0FF: not on the flood risk listCM21 0FG: not on the flood risk listCM21 0FJ: not on the flood risk listCM21 0FL: not on the flood risk listCM21 0FN: not on the flood risk listCM21 0FP: not on the flood risk listCM21 0FQ: not on the flood risk listCM21 0FR: not on the flood risk listCM21 0FS: not on the flood risk listCM21 0FT: not on the flood risk listCM21 0HA: not on the flood risk listCM21 0HB: not on the flood risk listCM21 0HD: not on the flood risk listCM21 0HE: not on the flood risk listCM21 0HF: not on the flood risk listCM21 0HG: not on the flood risk listCM21 0HH: not on the flood risk listCM21 0HL: not on the flood risk listCM21 0HN: not on the flood risk listCM21 0HP: not on the flood risk listCM21 0HQ: not on the flood risk listCM21 0HR: not on the flood risk listCM21 0HS: not on the flood risk listCM21 0HT: not on the flood risk listCM21 0HU: not on the flood risk listCM21 0HX: not on the flood risk listCM21 0HY: not on the flood risk listCM21 0HZ: not on the flood risk listCM21 0JA: not on the flood risk listCM21 0JB: not on the flood risk listCM21 0JD: not on the flood risk listCM21 0JE: not on the flood risk listCM21 0JJ: not on the flood risk listCM21 0JL: not on the flood risk listCM21 0JN: not on the flood risk listCM21 0JP: not on the flood risk listCM21 0JQ: not on the flood risk listCM21 0JR: not on the flood risk listCM21 0JT: not on the flood risk listCM21 0JU: not on the flood risk listCM21 0JW: not on the flood risk listCM21 0JX: not on the flood risk listCM21 0JY: not on the flood risk listCM21 0JZ: not on the flood risk listCM21 0LA: not on the flood risk listCM21 0LD: not on the flood risk listCM21 0LE: not on the flood risk listCM21 0LF: not on the flood risk listCM21 0LH: not on the flood risk listCM21 0LJ: not on the flood risk listCM21 0LL: not on the flood risk listCM21 0LQ: not on the flood risk listCM21 0LS: not on the flood risk listCM21 0LT: not on the flood risk listCM21 0LU: not on the flood risk listCM21 0LX: not on the flood risk listCM21 0LY: not on the flood risk listCM21 0NA: not on the flood risk listCM21 0ND: not on the flood risk listCM21 0NG: not on the flood risk listCM21 1BB: not on the flood risk listCM21 9AA: not on the flood risk listCM21 9AB: not on the flood risk listCM21 9AD: not on the flood risk listCM21 9AE: not on the flood risk listCM21 9AG: not on the flood risk listCM21 9AH: not on the flood risk listCM21 9AJ: not on the flood risk listCM21 9AN: not on the flood risk listCM21 9AQ: not on the flood risk listCM21 9AT: not on the flood risk listCM21 9AX: not on the flood risk listCM21 9AY: not on the flood risk listCM21 9AZ: not on the flood risk listCM21 9BA: not on the flood risk listCM21 9BB: not on the flood risk listCM21 9BD: not on the flood risk listCM21 9BE: not on the flood risk listCM21 9BG: not on the flood risk listCM21 9BH: not on the flood risk listCM21 9BJ: not on the flood risk listCM21 9BL: not on the flood risk listCM21 9BN: not on the flood risk listCM21 9BS: not on the flood risk listCM21 9BU: not on the flood risk listCM21 9BW: not on the flood risk listCM21 9BX: not on the flood risk listCM21 9BY: not on the flood risk listCM21 9DA: not on the flood risk listCM21 9DB: not on the flood risk listCM21 9DD: not on the flood risk listCM21 9DE: not on the flood risk listCM21 9DF: not on the flood risk listCM21 9DG: not on the flood risk listCM21 9DH: not on the flood risk listCM21 9DL: not on the flood risk listCM21 9DN: not on the flood risk listCM21 9DP: not on the flood risk listCM21 9DQ: not on the flood risk listCM21 9DR: not on the flood risk listCM21 9DT: not on the flood risk listCM21 9DU: not on the flood risk listCM21 9EA: not on the flood risk listCM21 9EB: not on the flood risk listCM21 9ED: not on the flood risk listCM21 9EH: not on the flood risk listCM21 9EJ: not on the flood risk listCM21 9EL: not on the flood risk listCM21 9EN: not on the flood risk listCM21 9EP: not on the flood risk listCM21 9ER: not on the flood risk listCM21 9EU: not on the flood risk listCM21 9EW: not on the flood risk listCM21 9EX: not on the flood risk listCM21 9EY: not on the flood risk listCM21 9FA: not on the flood risk listCM21 9FB: not on the flood risk listCM21 9FD: not on the flood risk listCM21 9FF: not on the flood risk listCM21 9FG: not on the flood risk listCM21 9FH: not on the flood risk listCM21 9FQ: not on the flood risk listCM21 9FR: not on the flood risk listCM21 9GY: not on the flood risk listCM21 9GZ: not on the flood risk listCM21 9HA: not on the flood risk listCM21 9HB: not on the flood risk listCM21 9HD: not on the flood risk listCM21 9HE: not on the flood risk listCM21 9HG: not on the flood risk listCM21 9HH: not on the flood risk listCM21 9HJ: not on the flood risk listCM21 9HN: not on the flood risk listCM21 9HP: not on the flood risk listCM21 9HR: not on the flood risk listCM21 9HS: not on the flood risk listCM21 9HT: not on the flood risk listCM21 9HU: not on the flood risk listCM21 9HY: not on the flood risk listCM21 9HZ: not on the flood risk listCM21 9JA: not on the flood risk listCM21 9JF: not on the flood risk listCM21 9JG: not on the flood risk listCM21 9JJ: not on the flood risk listCM21 9JL: not on the flood risk listCM21 9JN: not on the flood risk listCM21 9JP: not on the flood risk listCM21 9JR: not on the flood risk listCM21 9JS: not on the flood risk listCM21 9JT: not on the flood risk listCM21 9JZ: not on the flood risk listCM21 9LD: not on the flood risk listCM21 9LE: not on the flood risk listCM21 9LF: not on the flood risk listCM21 9LG: not on the flood risk listCM21 9LH: not on the flood risk listCM21 9LJ: not on the flood risk listCM21 9LL: not on the flood risk listCM21 9LN: not on the flood risk listCM21 9LP: not on the flood risk listCM21 9LQ: not on the flood risk listCM21 9LW: not on the flood risk listCM21 9LZ: not on the flood risk listCM21 9NA: not on the flood risk listCM21 9NB: not on the flood risk listCM21 9ND: not on the flood risk listCM21 9NE: not on the flood risk listCM21 9NF: not on the flood risk listCM21 9NG: not on the flood risk listCM21 9NH: not on the flood risk listCM21 9NJ: not on the flood risk listCM21 9NN: not on the flood risk listCM21 9NP: not on the flood risk listCM21 9NQ: not on the flood risk listCM21 9NR: not on the flood risk listCM21 9NT: not on the flood risk listCM21 9NU: not on the flood risk listCM21 9NW: not on the flood risk listCM21 9NX: not on the flood risk listCM21 9PN: not on the flood risk listCM21 9PP: not on the flood risk listCM21 9PR: not on the flood risk listCM21 9PS: not on the flood risk listCM21 9PT: not on the flood risk listCM21 9PU: not on the flood risk listCM21 9PW: not on the flood risk listCM21 9PX: not on the flood risk listCM21 9PY: not on the flood risk listCM21 9PZ: not on the flood risk listCM21 9QD: not on the flood risk listCM21 9QH: not on the flood risk listCM21 9QJ: not on the flood risk listCM21 9QN: not on the flood risk listCM21 9QP: not on the flood risk listCM21 9RA: not on the flood risk listCM21 9RB: not on the flood risk listCM21 9RD: not on the flood risk listCM21 9RE: not on the flood risk listCM21 9RF: not on the flood risk listCM21 0LR: low flood risk at worstCM21 9BQ: low flood risk at worstCM21 9ET: low flood risk at worstCM21 9FJ: low flood risk at worstCM21 9FN: low flood risk at worstCM21 9FP: low flood risk at worstCM21 9HX: low flood risk at worstCM21 9JE: low flood risk at worstCM21 9PF: low flood risk at worstCM21 9DX: medium flood risk at worstCM21 9NS: medium flood risk at worstCM21 9NY: medium flood risk at worstCM21 9PE: medium flood risk at worstCM21 0BW: high flood riskCM21 0LB: high flood riskCM21 0LP: high flood riskCM21 0NB: high flood riskCM21 0RL: high flood riskCM21 9BZ: high flood riskCM21 9DJ: high flood riskCM21 9DW: high flood riskCM21 9FE: high flood riskCM21 9JB: high flood riskCM21 9JX: high flood riskCM21 9JY: high flood riskCM21 9LR: high flood riskCM21 9PL: high flood risk Sawbridgeworth Map of every postcode in CM21, by flood risk Of the 319 postcodes in CM21 that ONS places, 14 have a home or business at high risk, 4 are at medium risk at worst, 9 are at low risk at worst and 292 are not on the Environment Agency's at-risk list. Places named: Sawbridgeworth. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. Sawbridgeworth
  • A home or business at high risk: 14
  • At medium risk at worst: 4
  • At low risk at worst: 9
  • At very low risk only: 0
  • Not on the at-risk list: 292

Of the 319 postcodes in CM21 that ONS places, 14 have a home or business at high risk, 4 are at medium risk at worst, 9 are at low risk at worst and 292 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 51.8125, longitude 0.1450. 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

14 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.

CM21 9DJ20 at high riskCM21 9PL8 at high riskCM21 9FE7 at high riskCM21 0LB5 at high riskCM21 9DW3 at high riskCM21 9JY3 at high riskCM21 0RL2 at high riskCM21 9JX2 at high riskCM21 0NB2 at high riskCM21 0BW1 at high riskCM21 0LP1 at high riskCM21 9BZ1 at high risk

What broadband can you get in CM21?

Ofcom reports on 310 of the 319 postcodes in CM21. At 177 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 gigabit177 of 310
Postcodes where every home can get superfast273 of 310
Postcodes where some cannot get decent broadband1 of 310

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 CM21 at risk of flooding?

27 of the 319 postcodes in CM21 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 79 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 27 of 319 postcodes High: 57Medium: 22Low: 340Very 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 CM21?

Homes in CM21 sold for a typical £428,500 in the 12 months to August 2026, across 128 sales, down 10.1% on the 12 months before, HM Land Registry's figures show.

£428,500 typical price, the 12 months to August 2026
12 months to August 2025
£476,500
12 months to August 2026
£428,500

▼ down 10.1% on the 12 months before

Detached£645,000 31 sales
Semi-detached£485,000 37 sales
Terraced£330,000 29 sales
Flat or maisonette£215,000 31 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 CM21

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

CM21 0136 postcodesCM21 18 postcodesCM21 9175 postcodes
UK postcode format explained

Places in CM21

Towns and villages with postcodes in CM21, and how many each has here.

Sawbridgeworth postcodes,265

Who covers CM21

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

  • Hertford and Stortford274
  • Harlow45

Police force areas

  • Hertfordshire274
  • Essex45

Next to CM21

CM20 postcode district CM22 postcode district All CM districts Sawbridgeworth postcodes

"Next to" is by number: the districts before and after CM21 in the CM area.

Check a postcode

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