| AL1 |
ST ALBANS |
St Albans |
St Albans |
| AL2 |
ST ALBANS |
St Albans, Bricket Wood, Colney Street, Frogmore, London Colney, Napsbury, Park Street, Potters Crouch, Chiswell Green |
St Albans, Hertsmere |
| AL3 |
ST ALBANS |
St Albans, Childwickbury, Flamstead, Gorhambury, Markyate, New Greens, Porters Wood, Redbourn, Sandridge |
St Albans, Dacorum |
| AL4 |
ST ALBANS |
St Albans, Blackmore End, Colney Heath, London Colney, Jersey Farm, Marshalswick, Oaklands, Sandridge, Smallford, Tyttenhanger, Wheathampstead |
St Albans, Hertsmere, North Hertfordshire |
| AL5 |
HARPENDEN |
Harpenden, Kinsbourne Green |
St Albans |
| AL6 |
WELWYN |
Welwyn, Ayot St Peter, Ayot St Lawrence, Digswell, Rabley Heath, Tewin |
Welwyn Hatfield, East Hertfordshire, North Hertfordshire |
| AL7 |
WELWYN GARDEN CITY |
Welwyn Garden City (east) |
Welwyn Hatfield |
| AL8 |
WELWYN GARDEN CITY |
Welwyn Garden City (west), Lemsford |
Welwyn Hatfield |
| AL9 |
HATFIELD |
Hatfield (Old Hatfield), Brookmans Park, Essendon, North Mymms, Welham Green |
Welwyn Hatfield |
| AL10 |
HATFIELD |
Hatfield (new town) |
Welwyn Hatfield |