Technical documents for the decennial census conducted in the 50 states, Washington D.C., and Puerto Rico.

Technical documents for the censuses conducted in American Samoa, Guam, Commonwealth of Northern Mariana Islands, and U.S. Virgin Islands.

Learn how the Decennial Census questionnaires have changed through the decades and download questionnaires from each Census decade.

Download and view the available technical documentation for the Special Tabulations.

Executive summary of the methodology used for calculating the December 5, 2016 release of the Section 203 Determinations.