Twenty-second Census of the United States
U.S. Census Bureau Seal
General information
Date taken	April 1, 2000
Total U.S. population	281,421,906
Percent change	13.2%
Most populous state	California 33,871,648
Least populous state	Wyoming 493,782
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The Twenty-Second United States Census, known as Census 2000 was a count of the population of the United States. It was done by the Census Bureau. It found that the population of the United States on April 1, 2000 was 281,421,906. This was an increase of 13.2% over the 248,709,873 people counted during the 1990 Census. This was the twenty-second federal census. It was the largest single administrative effort in the history of the United States that was not done during wartime.