Sectors in RM20
| Sector | Main place | Postcodes |
|---|---|---|
| RM20 1 | West Thurrock | 3 |
| RM20 2 | West Thurrock | 12 |
| RM20 3 | West Thurrock | 88 |
| RM20 4 | South Stifford | 58 |
Places covered by RM20
- West Thurrock Thurrock · 127
- South Stifford Thurrock · 29
- Grays Thurrock · 2
- Purfleet-on-Thames Thurrock · 2