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Historical U.S. census and vital records

1910 census

91.9 million persons

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

Publications: Data and Statistical Services (DSS): Decennial Censuses 1790-2000  and https://www.census.gov/prod/www/decennial.html

1920 census

105.7 million persons

Publications: Data and Statistical Services (DSS): Decennial Censuses 1790-2000 and https://www.census.gov/prod/www/decennial.html

1930 census

122.7 million persons

Publications: Data and Statistical Services (DSS): Decennial Censuses 1790-2000  and https://www.census.gov/prod/www/decennial.html

1940 census

131.7 million persons

http://1940census.archives.gov/

Publications: Data and Statistical Services (DSS): Decennial Censuses 1790-2000 and https://www.census.gov/prod/www/decennial.html