Definition
GEO1_UK1861 identifies the household's division within the United Kingdom in 1861. Each census division is made up of either complete Registration Counties or parts of Registration Counties. Divisions are the primary level of geography for the United Kingdom. Other geography variables from 1861 United Kingdom include, COUNTYUK, DISTUK, SUBDISTUK, and PARISHUK_1861.
The relationship among different historical UK geographic units is described in separate files for England and Wales and Scotland.