The census was to have been effective on these dates. Although some enumerators did not fully comply, I use these dates instead of the actual date the enumerator took that page unless I see an obvious error. 1st-4th Censuses, 1790-1820 First Monday in August 5th-12th Censuses, 1830-1900 June 1 13th Census, 1910 April 15 14th Census, 1920 January 1 15-22nd Censuses, 1930-2000 April 1 Cliff Bowlin Colorado Springs