1851 Census of Great Britain, Tables of Population and Houses in the Divisions, Registration Counties, and Districts of England and Wales; in the Counties, Cities, and Burghs of Scotland; and in the Islands in the British Seas, Table 1 : " Great Britain. Population in 1851".

  Persons Males Females
POPULATION 21,104,072 10,360,325 10,743,747
Population enumerated on March 31st, 1851 20,936,468 10,192,721 10,743,747
The part of the Army, Navy, and Merchant Seamen belonging to Great Britain, but out of the Country when the Census was taken, (estimated from returns) 167,604 167,604 —