United States Census Bureau  - Census.gov Population conducted every 10 years since 1790 there is also agricultural, economic and government censuses designates Congressional Districts provides valuable data for government spending collected data has changed dramatically   For Census Bureau publications in Tutt Garden Level,  use catalog to find.

1. Demographic

Decennial census records are confidential for 72 years to protect respondents' privacy.

• Decennial Census History, 1790-2010
  • Individual census records from 1790 to 1940 are maintained by the National Archives and Records Administration, not the U.S. Census Bureau.
  • Publications related to the census data collected from 1790 to 2010 are available at https://www.census.gov/prod/www/decennial.html.
  • 1940 Census Online
• Decennial Census - 1st onward, Tutt Garden Level @ C3.X:year

See also the Census Guide for publications at Tutt Library, some online publications and Colorado state information