| Place | Postal Code |
|---|---|
| Bower Heath, East of England) | AL5 |
| Bricket Wood, East of England) | AL2 |
| Childwickbury, East of England) | AL3 |
| Colney Heath, East of England) | AL4 |
| Colney Street, East of England) | AL2 |
| Frogmore, East of England) | AL2 |
| Gorhambury, East of England) | AL3 |
| Harpenden, East of England) | AL5 |
| Kings Park, East of England) | AL3 |
| Kinsbourne Green, East of England) | AL5 3PZ, AL5 3QB |
| London Colney, East of England) | AL2, AL4 |
| Marshalswick, East of England) | AL4 9AQ |
| Napsbury, East of England) | AL2 |
| Postal Codes in Hertfordshire | |
|---|---|
| Broxbourne | |
| Dacorum | |
| East Hertfordshire | |
| Hertsmere | |
| North Hertfordshire | |
| St. Albans | |
| Stevenage | |
| Three Rivers | |
| Watford | |
| Welwyn Hatfield | |