US Federal Census Dates

It is important to use the official census dates when incorporating census information into genealogy records. Each census year is assigned an official date by the census agency. Enumerators are instructed to ask that answers to their questions be “as of” that official date, notwithstanding the actual date a particular enumerator may have visited a particular household, and whether or not that date was recorded on the schedule. Because it is impossible to know if enumerators and attestors adhered to those “as of” instructions, assuming the official date was adhered to assures consistency in genealogy records when calculating event dates from census information.  This is especially important in later censuses, where the age of children may be given in both years and months.

Official Census Dates

1790: 2 Aug 1790
1800: 4 Aug 1800
1810: 6 Aug 1810
1820: 7 Aug 1820
1830: 1 Jun 1830
1840: 1 Jun 1840
1850: 1 Jun 1850
1860: 1 Jun 1860
1870: 1 Jun 1870
1880: 1 Jun 1880
1890: 2 Jun 1890
1900: 1 Jun 1900
1910: 15 Apr 1910
1920: 1 Jan 1920
1930: 1 Apr 1930
1940: 1 Apr 1940

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