Historical U.S. census and vital records

91.9 million persons

Geography: Add Arizona, New Mexico, Oklahoma; Puerto Rico (first census 1899; then 1910 and decennially.)

Publications:  https://www.census.gov/prod/www/decennial.html

105.7 million persons

Publications:  https://www.census.gov/prod/www/decennial.html

122.7 million persons

Publications: https://www.census.gov/prod/www/decennial.html

131.7 million persons

http://1940census.archives.gov/

Publications: https://www.census.gov/prod/www/decennial.html