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Map of coverage of the 1870 census.
For more information: Map Guide to the U.S. Federal Censuses, 1790 - 1920 (GovPub Reference HA195 .T46 1987)
Multi-year census compilations (compare across years)
These tend to include statistics for large geographic areas (eg states) but can be very useful when comparing statistics over time. See: list of all census compilations
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. 1930 is the most recent population schedule available. Below are links to print and on-line versions of the population schedules. The library also has selected population schedules available on microfilm.