CM21 crime rate and statistics

Last 12 published months

September 2025 to August 2026. Street-crime records include anti-social behaviour.

Month-by-month totals

Street-crime records per 1,000 residents

Published street-crime records (including anti-social behaviour), September 2025 to August 2026, per 1,000 usual residents in the Census 2021.

660 records and 11,395 residents. Residents-only rates overstate crime where many people visit who do not live there, such as city centres, stations, and retail parks. Residents are counted at March 2021 while records are current, so areas with many newer homes can read higher.

No England and Wales comparison is shown, because not every force involved has published every month of this window.

Rates cover England and Wales only. Residents: Office for National Statistics, Census 2021 postcode estimates, Open Government Licence v3.0. How rates are built.

Top crime categories

Share of CM21 records in the same trailing window. The black line on each bar marks the England and Wales share for the same months.

• Violence and sexual offences38.6%

  255 records · England and Wales 35.5%

• Anti-social behaviour20.0%

  132 records · England and Wales 15.7%

• Vehicle crime10.6%

  70 records · England and Wales 5.1%

• Public order6.2%

  41 records · England and Wales 6.9%

• Other theft5.6%

  37 records · England and Wales 6.7%

• Burglary5.2%

  34 records · England and Wales 3.7%

• Criminal damage and arson5.0%

  33 records · England and Wales 7.0%

• Other crime2.9%

  19 records · England and Wales 2.2%

Where records cluster in CM21

Records by part of CM21: the south-east 310, the east 193, the south 85, the south-west 40, the west 13, the north-west 2.

North is at the top. Each hexagon is about 290 m across, the size the crime map uses zoomed in, and holds at least one of CM21's postcodes; darker ones hold more records. Hexagons at the edge also hold records from neighbouring districts, and CM21's records placed outside these hexagons are not drawn, so the map's counts won't add up to the page's total. Police place each record at an approximate public point, so this shows which parts of CM21 records cluster in, not where incidents happened. Explore CM21 on the crime map.

Year by year

Calendar-year totals for CM21 (December 2013 to August 2026).

Police forces

CM21's records from September 2025 to August 2026 were published by Hertfordshire Constabulary (90.5%), Essex Police (8.8%), Metropolitan Police (0.5%) and Suffolk Constabulary (0.3%).

Postcode sectors in CM21

Each sector is the outward code plus the first digit of the inward code. Counts cover the same trailing window.

Highest and lowest published crime rates by postcode district

Deprivation where residents live

Covers 100.0% of the 11,395 Census 2021 residents of CM21.

England: English Indices of Deprivation 2025

Of these residents in England, 0.0% live in the most deprived 20% of England's neighbourhoods and 75.5% in the least deprived 20%.

Share of residents in each decile, from 1 (most deprived) to 10 (least deprived) of England's small areas.

Deciles rank neighbourhoods within one nation, so English and Welsh deciles don't compare. They describe areas, not the people living in them, and crime is one of the things the index measures, so this mix partly overlaps the crime figures above. How this is built.

About CM21 beyond crime

Figures below come from official open datasets, joined on postcode. Sources are listed on the methodology page.

House prices

Median sold price by year, with the number of sales in brackets, from HM Land Registry Price Paid Data (standard residential sales in England and Wales). A median is shown only where there were at least five sales. Edition: yearly files 2022 to 2026.

Schools and colleges

5 open establishments with a postcode in CM21, from the Department for Education's Get Information About Schools register. Edition: extract of 29 Oct 2026.

Flood risk from rivers and the sea

Postcodes in England with properties in each band (Environment Agency), counted by the highest long-term risk band of any property in the postcode. Postcodes not listed have no property in a rivers-and-sea risk area, and postcodes outside England are not covered. Risk applies to the area around an address, not the address itself. Surface-water risk is not published by postcode. Edition: NaFRA2, revised 18 Jun 2026.

Broadband

Share of the 310 postcodes in CM21 where every premises, or at least one, can get each fixed service, from Ofcom Connected Nations. Ofcom does not publish full-fibre availability by postcode. Edition: Connected Nations, July 2025 data.

Free monthly alerts

Get one email a month when new police records are published for CM21.

Cite this page

This page updates as new months are published, so a citation needs the months shown and the date you read it. One click selects the whole citation. The CSV holds this page's monthly and category figures for CM21 postcode district, with the same source and months.

CrimeMapsUK. CM21 postcode district: published street-crime records, September 2025 to August 2026. Source: data.police.uk, Open Government Licence v3.0. Retrieved 30 October 2026. Police locations are approximate; records are assigned to the area by nearest postcode. Postcode centroids from the ONS Postcode Directory. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. https://crimemapsuk.com/crime/districts/cm21/