Hi Listers I wrote the census bureau to find out the starting enumeration dates for the censuses. They are listed below Here are the dates for each census year. You can find more information on the federal censuses in our publication, "Measuring America: The Decennial Censuses From 1790-2000." From our homepage, Publications, General & Reference, Measuring America. 1790 First Monday in August 1790 1800 First Monday in August 1800 1810 First Monday in August 1810 1820 First Monday in August 1820 1830 June 1, 1830 1840 June 1, 1840 1850 June 1, 1850 1860 June 1, 1860 1870 June 1, 1870 1880 June 1, 1880 1890 June 1, 1890 1900 June 1, 1900 1910 April 15, 1910 1920 January 1, 1920 1930 April 1, 1930 1940 April 1, 1940 1950 April 1, 1950 1960 April 1, 1960 1970 April 1, 1970 1980 April 1, 1980 1990 April 1, 1990 2000 April 1, 2000 History Staff Allen