# CM4

2 sectors, 442 postcodes

- **Part of:** [CM](https://openpostcodes.uk/CM)
- **Local authorities:** Brentwood, Chelmsford, Epping Forest, Basildon

## Sectors

| Sector | Postcodes | Local authority |
|---|---|---|
| [CM4 0](https://openpostcodes.uk/CM4%200) | 209 | Brentwood |
| [CM4 9](https://openpostcodes.uk/CM4%209) | 233 | Chelmsford |