Map of coverage of the 1840 census.
For more information: Map Guide to the U.S. Federal Censuses, 1790 - 1920 (GovPub Reference HA195 .T46 1987)
Census population schedules (or "name schedules" or "manuscript census") are copies of the original questionnaires collected during each decennial census. They list the individual names and family information of the people enumerated. Unlike the statistics published soon after the census, the population schedules remain confidential for 72 years. 1950 is the most recent population schedule available.