| England | Pre April 1974 |
| County | Chapman Code |
| Bedfordshire | BDF |
| Berkshire | BRK |
| Buckinghamshire | BKM |
| Cambridgeshire | CAM |
| Cheshire | CHS |
| Cornwall | CON |
| Cumberland | CUL |
| Derbyshire | DBY |
| Devonshire | DEV |
| Dorset | DOR |
| Durham | DUR |
| Essex | ESS |
| Gloucestershire | GLS |
| Hampshire | HAM |
| Herefordshire | HEF |
| Hertfordshire | HRT |
| Huntingdonshire | HUN |
| Kent | KEN |
| Lancashire | LAN |
| Leicestershire | LEI |
| Lincolnshire | LIN |
| London | LND |
| Middlesex | MDX |
| Norfolk | NFK |
| Northamptonshire | NTH |
| Northumberland | NBL |
| Nottinghamshire | NTT |
| Oxfordshire | OXF |
| Rutland | RUT |
| Shropshire | SAL |
| Somerset | SOM |
| Staffordshire | STS |
| Suffolk | SFK |
| Surrey | SRY |
| Sussex | SSX |
| Warwickshire | WAR |
| Westmoreland | WES |
| Wiltshire | WIL |
| Worcestershire | WOR |
| Yorkshire East Riding | ERY |
| Yorkshire North Riding | NRY |
| Yorkshire West Riding | WRY |
| Wales | Pre 1974 |
| Anglesey | AGY |
| Breconshire | BRE |
| Caernarvonshire | CAE |
| Cardiganshire | CGN |
| Carmarthenshire | CMN |
| Denbighshire | DEN |
| Flintshire | FLN |
| Glamorgan | GLA |
| Merionethshire | MER |
| Monmouthshire | MON |
| Montgomeryshire | MGY |
| Pembrokeshire | PEM |
| Radnorshire | RAD |
| Scotland | Pre May 1975 |
| Aberdeenshire | ABD |
| Angus (Forfarshire) | ANS |
| Argyllshire | ARL |
| Ayrshire | AYR |
| Banffshire | BAN |
| Berwickshire | BEW |
| Bute | BUT |
| Caithness | CAI |
| Clackmannanshire | CLK |
| Dunbartonshire | DNB |
| Dumfries-shire | DFS |
| East Lothian | ELN |
| Fife | FIF |
| Inverness-shire | INV |
| Kincardineshire | KCD |
| Kinross-shire | KRS |
| Kirkcudbrightshire | KKD |
| Lanarkshire | LKS |
| Midlothian | MLN |
| Morayshire | MOR |
| Nairn | NAI |
| Orkney | OKI |
| Peebles-shire | PEE |
| Perth | PER |
| Renfrewshire | RFW |
| Ross and Cromarty | ROC |
| Roxburghshire | ROX |
| Selkirkshire | SEL |
| Shetland | SHI |
| Stirlingshire | STI |
| Sutherland | SUT |
| West Lothian | WLN |
| Wigtownshire | WIG |
| Islands | Pre 1974 |
| Isle of Man | IOM |
| Alderney | ALD |
| Guernsey | GSY |
| Jersey | JSY |
| Sark | SRK |