The following lists the counties of the United Kingdom and Ireland that are used in the calendar and index.
The counties used in this edition, for the British Isles and Ireland are the historic counties, in Britain those used are those before the local government re-organisation in 1974.
For the abbreviations see Hunnisett, Indexing for Editors, p. 24. The abbreviations are only used in the index when they follow a place-name in the calendar, but are never used in the main calendar when it is the county itself that is being referred to.
| County Name | Abbreviation |
|---|---|
| Bedfordshire | Beds |
| Berkshire | Berks |
| Buckinghamshire | Bucks |
| Cambridgeshire | Cambs |
| Cheshire | Chesh |
| Cornwall | Cornw |
| Cumberland | Cumb |
| Derbyshire | Derbs |
| Devon | - |
| Dorset | Dors |
| Durham | Durh |
| Essex | - |
| Gloucestershire | Glos |
| Hampshire | Hants |
| Herefordshire | Heref |
| Hertfordshire | Herts |
| Huntingdonshire | Hunts |
| Kent | - |
| Lancashire | Lancs |
| Leicestershire | Leics |
| Lincolnshire | Lincs |
| Middlesex | Midd |
| Norfolk | Norf |
| Northamptonshire | Northants |
| Northumberland | Northumb |
| Nottinghamshire | Notts |
| Oxfordshire | Oxon |
| Rutland | Rut |
| Shropshire | Salop |
| Somerset | Som |
| Staffordshire | Staffs |
| Suffolk | Suff |
| Surrey | - |
| Sussex | - |
| Warwickshire | Warw |
| Westmorland | Westmor |
| Wiltshire | Wilts |
| Worcestershire | Worcs |
| Yorkshire | Yorks |
See Richards, Melville, Welsh Administrative and Territorial Units, Medieval and Modern (Cardiff, 1969), pp. 231-2.
| Anglesey | Glamorgan |
| Brecknock | Merioneth |
| Caernarvon | Monmouthshire |
| Cardiganshire | Montgomeryshire |
| Carmarthenshire | Pembrokeshire |
| Denbighshire | Radnorshire |
| Flintshire |
| Aberdeenshire | Lanarkshire | |
| Angus (also known as Forfarshire) | Midlothian (Edinburghshire) | |
| Argyll (including Islay, Jura and Mull) | Moray | |
| Banffshire | Nairnshire | Orkney |
| Berwickshire (except Berwick) | Peeblesshire | |
| Bute (including Arran) | Perthshire | |
| Caithness | Renfrewshire | |
| Clackmannanshire | Ross & Cromarty | |
| Dunbartonshire | Roxburghshire | |
| Dumfriesshire | Selkirkshire | |
| East Lothian (Haddingtonshire) | Shetland | |
| Fife | Stirlingshire | |
| Inverness-shire (includes North & South Uist, & part of Lewis | ||
| Kincardineshire | Sutherland | |
| Kinross-shire | West Lothian (Linlithgowshire) | |
| Kirkcudbrightshire | Wigtownshire |
The counties are as set out in Gasaitéar na hÉireann /Gazetteer of Ireland; Ordnance Survey of Ireland (Dublin, 1989), p. xxxiv.
| Antrim | Limerick |
| Armagh | Londonderry |
| Carlow | Longford |
| Cavan | Louth |
| Clare | Mayo |
| Cork | Meath |
| Donegal | Monaghan |
| Down | Offaly |
| Dublin | Roscommon |
| Fermanagh | Sligo |
| Galway | Tipperary |
| Kerry | Tyrone |
| Kildare | Waterford |
| Kilkenny | Westmeath |
| Laois | Wexford |
| Leitrim | Wicklow |