The information requested falls within the responsibility of the UK Statistics Authority. I have asked the authority to reply
Letter from Karen Dunnell, National Statistician, to Lord Taylor, dated June 2009.
As National Statistician, I have been asked to reply to your Question asking whether Her Majesty's Government supply the United States Census Bureau with United Kingdom population statistics; and, if so, in what form and how frequently. (HL4053)
Population statistics are published on the ONS website where they are available publicly for all users at www.statistics.gov.uk/statbase/Product.asp?vlnk= 601&More=N.
No other Census or other population statistics are supplied to the United States Census Bureau.