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U.S. Federal Census records
The library has printed and/or CD indexes for the PA federal census for 1790-1880, 1900-1930.   Microfilm of Chester County federal census for 1790-1930; also Delaware County 1850-1930; Lancaster County 1850-1870, 1930; Montgomery County 1850-1920 (part), 1930; Berks County 1850-1920 and Bucks County 1820-1920. We also have a large collection of census microfilm for Philadelphia – please ask us about these!

Pennsylvania Septennial Census
Paper copies of the State Septennial census for Chester County. This is a state census of taxable adults (usually males of legal age). It was taken every seven years beginning ca. 1800 (1800, 1807, 1814, 1821, 1828, etc.) for most townships. The Septennial census is an alphabetical list of names that sometimes includes occupations. The purpose of this census was to help the state calculate local representation at the state level.