- U.S. Census Bureau official website
- National Historical Geographic Information System, a main source for freely downloading census data for the period 1790 through the present
- Integrated Public Use Microdata Series, the main source for census microdata for the period 1850 through the present
- CensusScope, from the Social Science Data Analysis Network
- Historical U.S. Census Browser, from the University of Virginia Library
- Census Findings – Questions Asked in Each Census Year, from CensusFinder.com.
- How the Census Works, from HowStuffWorks, Inc.
- Sources of U.S. Census Data, from MIT Libraries
- 1890 Census Supplement Book-Set
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