CM23
7 sectors, 1,193 postcodes
East Hertfordshire, Uttlesford
| Sector | Postcodes | Local authority |
|---|
| CM23 0 | 36 | East Hertfordshire |
| CM23 1 | 136 | Uttlesford |
| CM23 2 | 300 | East Hertfordshire |
| CM23 3 | 265 | East Hertfordshire |
| CM23 4 | 231 | East Hertfordshire |
| CM23 5 | 203 | East Hertfordshire |
| CM23 9 | 22 | East Hertfordshire |