RM postcode area
The RM area holds 20 districts and 10,007 live postcodes; its largest place is Dagenham.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| RM1 | 517 | Romford |
| RM2 | 268 | — |
| RM3 | 923 | Harold Wood |
| RM4 | 160 | Abridge |
| RM5 | 380 | Collier Row |
| RM6 | 530 | Chadwell Heath |
| RM7 | 574 | — |
| RM8 | 587 | Becontree |
| RM9 | 569 | — |
| RM10 | 583 | Dagenham |
| RM11 | 572 | Emerson Park |
| RM12 | 626 | Hornchurch |
| RM13 | 659 | Rainham |
| RM14 | 618 | Upminster |
| RM15 | 573 | South Ockendon |
| RM16 | 698 | Chafford Hundred |
| RM17 | 533 | Grays |
| RM18 | 333 | Tilbury |
| RM19 | 143 | Purfleet-on-Thames |
| RM20 | 161 | West Thurrock |
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Postcode data is the ONS Postcode Directory, August 2026 edition; counts are live postcodes with a usable location. Northern Ireland postcodes carry a separate licence and are not included; Scotland joins when the site's Scottish coverage does.