Series: T9   Rolls: 1 - 1454 1880 Facts 1. Tenth U.S. decennial population census. 2. U.S. population: 50.2 million 3. Census conducted by the Superintendent of the Census     (Census Office, U.S. Department of the Interior). 4. Census day: 1 June 1880. 5. Mandated copies: Two sets, one an abbreviated version to     the county court, full version to the Superintendent of the     Census.