| Parish | Description | Duration
|
| Aston | ancient parish, civil parish |
|
| Ayot St. Lawrence | ancient parish, civil parish |
|
| Ayot St. Peter | ancient parish, civil parish |
|
| Baldock | ancient parish, civil parish |
|
| Benington | ancient parish, civil parish |
|
| Bishops Hatfield | ancient parish, civil parish | until 1951 (then see Hatfield)
|
| Datchworth | ancient parish, civil parish |
|
| Digswell | ancient parish, civil parish |
|
| Graveley | ancient parish, civil parish |
|
| Great Munden | ancient parish, civil parish |
|
| Great Wymondley | chapelry, ancient parish, civil parish |
|
| Knebworth | ancient parish, civil parish |
|
| Letchworth | ancient parish, civil parish |
|
| Little Munden | ancient parish, civil parish |
|
| Little Wymondley | ancient parish, civil parish |
|
| Sacombe | ancient parish, civil parish |
|
| Stevenage | ancient parish, civil parish |
|
| Totteridge | chapelry, civil parish |
|
| Walkern | ancient parish, civil parish |
|
| Watton at Stone | ancient parish, civil parish |
|
| Welwyn | ancient parish, civil parish |
|
| Weston | ancient parish, civil parish |
|
| Willian | ancient parish, civil parish |
|
