Census Year	Census Date	Available From	LDS Film No.	PRO No.
1841	June 6th	Cambridgeshire Family History Society 1841 Searchable Database & Microfiche Sales		H107/80
1851	March 30th	Cambridgeshire Family History Society 1851 Searchable Database & Microfiche Sales		H107/1765
1861	April 7th			RG9/1042
1871	April 2nd			RG 10/1608
1881	April 3rd	U.K. Searchable C.D.'s available from The Church of Jesus Christ of Latter-day Saints	FHL Film 1341403	RG11/1689
1891	April 5th	View Census Records Online at Ancestry.com!		RG12/1300
1901	March 31st	The 1901 U.K. Online Census Website		RG13/1548

In the 1841 returns ages of persons over 15 years were generally given only to the nearest five years; in 1851 exact ages were returned.
1841 Census - Buckinghamshire - HUNDRED: Witchford (North) (Isle of Ely)