The U.S. Census Bureau collects detailed population data for the entire United States every 10 years. These data are combined with birth, death, migration, and net international immigration data to estimate populations for the years between (intercensal) or after (postcensal) censuses.
You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Census: Intercensal and Postcensal Data (PDF)(2 pp, 89 K)