| Place | Post Code |
|---|---|
| Ashbrook, East of England) | SG4 7JY |
| Ashwell, East of England) | SG7 |
| Baldock, East of England) | SG7 |
| Barkway, East of England) | SG8 |
| Barley, East of England) | SG8 |
| Bendish, East of England) | SG4 |
| Breachwood Green, East of England) | SG4 |
| Bygrave, East of England) | SG7 |
| Caldecote, East of England) | SG7 |
| Charlton, East of England) | SG4, SG5 |
| Clothall, East of England) | SG7 |
| Clothall Common, East of England) | SG7 6NS, SG7 6WA |
| Cockernhoe, East of England) | LU2 |
| Postal Codes in Hertfordshire | |
|---|---|
| Broxbourne | |
| Dacorum | |
| East Hertfordshire | |
| Hertsmere | |
| North Hertfordshire | |
| St. Albans | |
| Stevenage | |
| Three Rivers | |
| Watford | |
| Welwyn Hatfield | |