The Chapman Codes identify historical administrative divisions in the United Kingdom, Ireland, the Isle of Man and the Channel Islands. They were created by Dr Colin Chapman and are widely used in genealogy.
They have no postal relevance and are not recognised by the Royal Mail.
Chapman place codes (English counties are pre-1974)
ABD Aberdeenshire AGY Anglesey ALD Alderney ALL All Countries ANS Angus ANS Forfarshire ANT Antrim ARL Argyllshire ARM Armagh AYR Ayrshire BAN Banffshire BDF Bedfordshire BEW Berwickshire BKM Buckinghamshire BRE Brecknockshire BRK Berkshire BUT Buteshire CAE Caernarvonshire CAI Caithness-shire CAM Cambridgeshire CAR Carlow CAV Cavan CGN Cardiganshire CHI Channel Islands CHS Cheshire CLA Clare CLK Clackmannanshire CMN Carmarthenshire CON Cornwall COR Cork CUL Cumberland DBY Derbyshire DEN Denbighshire DEV Devon(shire) DFS Dumfriesshire DNB Dumbartonshire DON Donegal DOR Dorset DOW Down DUB Dublin DUR Durham ELN East Lothian ENG England ERY YKS East Riding ESS Essex FER Fermanagh FIF Fifeshire FLN Flintshire GAL Galway GLA Glamorgan GLS Gloucestershire GSY Guernsey HAM Hampshire HEF Herefordshire HRT Hertfordshire HUN Huntingdonshire INV Inverness-shire IOM Isle of Man IOW Isle of Wight IRL Ireland JSY Jersey KCD Kincardineshire KEN Kent KER Kerry KID Kildare KIK Kilkenny KKD Kirkcudbrightshire KRS Kinross-shire LAN Lancashire LDY Londonderry LEI Leicestershire LET Leitrim LEX Leix (Queens) LIM Limerick LIN Lincolnshire LKS Lanarkshire LND London (City only) LOG Longford LOU Louth MAY Mayo MDX Middlesex MEA Meath MER Merionethshire MGY Montgomeryshire MLN Midlothian MOG Monaghan MON Monmouthshire MOR Moray NAI Nairnshire NBL Northumberland NFK Norfolk NRY YKS North Riding NTH Northamptonshire NTT Nottinghamshire OFF Offaly (Kings) OKI Orkney Isles OXF Oxfordshire PEE Peeblesshire PEM Pembrokeshire PER Perthshire RAD Radnorshire RFW Renfrewshire ROC Ross & Cromarty ROS Roscommon ROX Roxburghshire RUT Rutland SAL Shropshire SCT Scotland SEL Selkirkshire SFK Suffolk SHI Shetland Isles SLI Sligo SOM Somerset SRK Sark SRY Surrey SSX Sussex STI Stirlingshire STS Staffordshire SUT Sutherland TIP Tipperary TYR Tyrone WAR Warwickshire WAT Waterford WEM Westmeath WES Westmorland WEX Wexford WIC Wicklow WIG Wigtownshire WIL Wiltshire WLN West Lothian WLS Wales WOR Worcestershire WRY YKS West Riding YKS Yorkshire