A registration county was, in the United Kingdom, a statistical unit used for the output of census information. Registration counties were formed by grouping together the registration districts wholly or partly within a county. As registration districts crossed county boundaries, the registration counties did not coincide precisely with any other types of county.
The registration counties were used in census results from 1851 to 1911. They were in part a predecessor of the administrative counties.

Scotland
33 registration counties are still used in Scotland for land registration purposes (see Registers of Scotland):

Aberdeen
Angus
Argyll
Ayr
Banff
Berwick
Bute
Caithness
Clackmannan
Dumfries
Dumbarton
East Lothian
Fife
Glasgow
Inverness
Kincardine
Kinross
Kirkcudbright
Lanark
Midlothian
Moray
Nairn
Orkney and Zetland
Peebles
Perth
Renfrew
Ross and Cromarty
Roxburgh
Selkirk
Stirling
Sutherland
West Lothian
Wigtown