Chapman County Codes
| England | ENG | ||||
| BDF | Bedfordshire | BKM | Buckinghamshire | BRK | Berkshire |
| BST | Bristol | CAM | Cambridgeshire | CHS | Cheshire |
| CON | Cornwall | CUL | Cumberland | DBY | Derbyshire |
| DEV | Devon | DOR | Dorset | DUR | Durham |
| ERY | Yorkshire East Riding | ESS | Essex | GLS | Gloucestershire |
| HAM | Hampshire | HEF | Herefordshire | HRT | Hertfordshire |
| HUN | Huntingdonshire | IOM | Isle of Man | IOW | Isle of Wight |
| KEN | Kent | LAN | Lancashire | LEI | Leicestershire |
| LIN | Lincolnshire | LND | London | MDX | Middlesex |
| NBL | Northumberland | NFK | Norfolk | NRY | Yorkshire North Riding |
| NTH | Northamptonshire | NTT | Nottinghamshire | OXF | Oxfordshire |
| RUT | Rutland | SAL | Shropshire | SFK | Suffolk |
| SOM | Somerset | SRY | Surrey | SSX | Sussex |
| STS | Staffordshire | WAR | Warwickshire | WES | Westmoreland |
| WIL | Wiltshire | WOR | Worcestershire | WRY | Yorkshire West Riding |
| YKS | Yorkshire | ||||
| Wales | WLS | ||||
| AGY | Anglesey | BRE | Brecknock | CAE | Caernarvonshire |
| CGN | Cardiganshire | CMN | Carmarthenshire | DEN | Denbighshire |
| FLN | Flintshire | GLA | Glamorgan | MER | Merioneth |
| MGY | Montgomeryshire | MON | Monmouthshire | PEM | Pembrokeshire |
| RAD | Radnor | ||||
| Other | Countries | ||||
| AUS | Australia | CAN | Canada | IRL | Ireland |
| NRL | Northern Ireland | NZ | New Zealand | SCT | Scotland |
| USA | United States of America |
Time Period Codes
| a = pre -1599 | b = 1600 - 1699 | c = 1700 - 1799 | d = 1800 - 1899 | e = 1900 -present |