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