These three-letter abbreviations identify English counties (pre-1974):
| BDF | Bedfordshire |
| Berkshire | BRK |
| BKM | Buckinghamshire |
| Cambridgeshire | CAM |
| CHS | Cheshire |
| Cornwall | CON |
| CUL | Cumberland |
| DBY | Derbyshire |
| Devon | DEV |
| DOR | Dorset |
| Durham | DUR |
| ESS | Essex |
| CLS | Gloucestershire |
| HAM | Hampshire |
| HEF | Herefordshire |
| HRT | Hertfordshire |
| Huntingdonshire | HUN |
| KEN | Kent |
| Lancashire | LAN |
| Leicestershire | LEI |
| LIN | Lincolnshire |
| London (city only) | LND |
| Middlesex | MDX |
| NFK | Norfolk |
| Northamptonshire | NTH |
| NBL | Northumberland |
| Nottinghamshire | NTT |
| Oxfordshire | OXF |
| RUT | Rutland |
| SAL | Shropshire (Salop) |
| SOM | Somerset |
| Staffordshire | STS |
| SFK | Suffolk |
| Surrey | SRY |
| SSX | Sussex |
| Warwickshire | WAR |
| WES | Westmorland |
| Wiltshire | WIL |
| WOR | Worcestershire |
| YKS | Yorkshire |
| ERY | Yorkshire-East Riding |
| Yorkshire-North Riding | NRY |
| Yorkshire-West Riding | WRY |
From the June 2000 issue of Family Tree Magazine
