CM20
Postcode districtPostcode district covering Harlow, Little Parndon and Mark Hall North, in Harlow.
Approximate outline worked out by Open Index from the ONS Postcode Directory: each census output area belongs to the district that holds most of its postcodes. People, homes, recorded crime and broadband add up those output areas. House sales count every sale with an CM20 postcode. How census figures are added up
Radon Affected Area by postcode district
Worked out by Open Index · 2022
About 0% of people in CM20 live in a 1 km square that the radon atlas marks as a radon Affected Area.
How CM20 compares
Each dot is a postcode district. The black line marks the middle one.
Is CM20 safe? What police records show
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in CM20 at a rate of 170.8 per 1,000 people.
That compares with 77.3 per 1,000 people across the CM postcode area.
In August 2026 alone, 412 cases of crime and anti-social behaviour were recorded in CM20.
In the 12 months to August 2026, the most common types were violence and sexual offences (1,768), other crime (977) and shoplifting (513).
A year earlier, the recorded crime rate in CM20 was 158.0 per 1,000 people.
Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates.
Rates are per resident, so places that many people work in or visit, such as Westminster, the City of London and other city centres, have far higher rates than their residents alone would suggest.
Deprivation in CM20, neighbourhood by neighbourhood
- Deprivation is ranked by neighbourhood, so CM20 has no single figure. Of its 14 neighbourhoods with a rank:
- Decile 1 (England’s most deprived 10%): 1 neighbourhood
- Decile 2: 1 neighbourhood
- Decile 3: 5 neighbourhoods
- Decile 4: 3 neighbourhoods
- Decile 5: 4 neighbourhoods
English Indices of Deprivation 2025. Decile 1 is the most deprived tenth of neighbourhoods in England.
Neighbourhoods in CM20
| Name | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
|---|---|---|---|---|
| Harlow 002A | 1,409 | 88.2 per 1,000 | 4 | 97.9% |
| Harlow 002B | 1,645 | 270.5 per 1,000 | 3 | 67.2% |
| Harlow 002C | 1,484 | 133.9 per 1,000 | 2 | 97.9% |
| Harlow 002D | 1,476 | 124.1 per 1,000 | 5 | 96.9% |
| Harlow 002E | 1,957 | 251.9 per 1,000 | 3 | 55.1% |
| Harlow 003A | 1,690 | 133.1 per 1,000 | 4 | 97.4% |
| Harlow 003B | 1,472 | 99.1 per 1,000 | 3 | 98.7% |
| Harlow 003C | 1,792 | 89.9 per 1,000 | 3 | 96.8% |
| Harlow 003D | 1,658 | 74.6 per 1,000 | 4 | 97.3% |
| Harlow 003E | 1,800 | 149.0 per 1,000 | 5 | 88.1% |
| Harlow 004A | 2,020 | 84.6 per 1,000 | 5 | 94.7% |
| Harlow 004B | 1,876 | 138.9 per 1,000 | 3 | 60.5% |
| Harlow 004E | 2,902 | 214.1 per 1,000 | 5 | 62.9% |
| Harlow 007F | 1,155 | 896.1 per 1,000 | 1 | 46.0% |
MPs for CM20
- Chris VinceLabour (Co-op)MP for Harlow95% of CM20’s postcodes
- Josh DeanLabourMP for Hertford and Stortford5.1% of CM20’s postcodes
As of , from the UK Parliament Members API. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: UK Parliament, Members API.
Middle areas in CM203
Postcode sectors in CM204
Council1
Towns in CM201
Postcode districts next to CM205
Nearest rail stations4
More in the CM postcode area2
CM20 in brief
CM20 is a postcode district covering Harlow, Little Parndon and Mark Hall North, in Harlow.
About 27,159 people lived in CM20 in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £315,000 in 2025 across 256 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 170.8 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in CM20 was £315,000 in 2025.
CM20 had 25,834 usual residents at the census.
About 0% of people in CM20 live in a 1 km square that the radon atlas marks as a radon Affected Area.
In CM20, 81.5% of homes and businesses could get gigabit-capable broadband in January 2026.