1930 United States census
The United States census of 1930, conducted by the Census Bureau one month from April 1, 1930, determined the resident population of the United States to be 122,775,046, an increase of 13.7 percent over the 106,021,537 persons enumerated during the 1920 census. Census questions. The 1930 census collected the following information: Full documentation for the 1930 census, including census forms and enumerator instructions, is available from the Integrated Public Use Microdata Series. Data availability. The original census enumeration sheets were microfilmed by the Census Bureau in 1949, after which the original sheets were destroyed. The microfilmed  census is located on 2,667 rolls of microfilm, and available from the National Archives and Records Administration. Several organizations also host images of the microfilmed census online, and digital indices. Microdata from the 1930 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.