Sectors in CO3
| Sector | Main place | Postcodes |
|---|---|---|
| CO3 0 | Colchester | 203 |
| CO3 3 | Colchester | 231 |
| CO3 4 | Colchester | 182 |
| CO3 8 | Colchester | 100 |
| CO3 9 | Colchester | 148 |
Places covered by CO3
- Colchester Colchester · 808
- Eight Ash Green Colchester · 29
- Copford Colchester · 6
- Heckfordbridge Colchester · 4