| United States|
| April 1, 1970|
The Nineteenth United States Census, conducted by the Census Bureau, determined the resident population of the United States to be 203,392,031, an increase of 13.4 percent over the 179,323,175 persons enumerated during the 1960 Census.
1970 United States Census Wikipedia
Microdata from the 1970 census are freely available through the Integrated Public Use Microdata Series. Aggregate data for small areas, together with electronic boundary files, can be downloaded from the National Historical Geographic Information System. These data were originally created and disseminated by DUALabs. Personally identifiable information will be available in 2042.
California took over as the most populous state, New York had previously been ranked number one. While the entire country increased to more than 204 million persons, four states lost population with West Virginia leading the list, down 8 and a half percent from 1960.