The 2001 Census was undertaken on the night of Sunday 29 April 2001. The UK Census was carried out by the Office for National Statistics (ONS) in England & Wales, the General Register Office for Scotland (GROS) and the Northern Ireland Statistics and Research Agency (NISRA).
Census Questionnaires (PDFs):
England & Wales
2001 Census Individual questionnaire – England
2001 Census Individual questionnaire – Wales
2001 Census Household questionnaire – England
2001 Census Household questionnaire – Wales (Cymraeg)
2001 Census Communal Establishment questionnaire – England & Wales
Scotland
2001 Census Individual questionnaire – Scotland
2001 Census Household questionnaire – Scotland (Gaelic)
2001 Census Communal Establishment questionnaire – Scotland
Northern Ireland
2001 Census Individual questonnaire – Northern Ireland
2001 Census Household questionnaire – Northern Ireland
2001 Census Communal Establishment questionnaire – Northern Ireland
Definitions & Metadata (PDFs):
Index of Topics of 2001 Census topics (i.e. a table of keywords and the tables numbers that contain details relating to these)
Glossary of 2001 Census terms
Census Table Layouts (PDFs):
2001 Standard Tables
2001 Census Area Statistics Tables
2001 Univariate Statistics Tables
2001 Armed Forces Tables
2001 Special Workplace Statistics
2001 Special Workplace Statistics – Scotland only
2001 Special Migration Statistics
Information relating to the 2001 Census data licensing arrangements is available from here.