England & Wales 1851 Census
About the 1851 census for England, Wales and Scotland
The 1851 census was taken on 30 March and gave the total population as 20,997,889.
Data included in the 1841 census:
Names - the surname and first name, and sometimes the middle name or initial
Born (county) - name of county given
Born (country) - name of country given
Relationship to head of household
Condition of marriage
Disability - "blind, deaf-and-dumb, imbecile or lunatic"
Additionally, where the 1891 and 1901 census was taken in Wales, the census included a question on the language spoken