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• 1840 Census Mercer County

  Transcription for Mercer County, Pennsylvania - 1840 complete - all townships and boroughs including Mahoning, Neshannock and Slippery Rock Townships that later became part of Lawrence County, Pennsylvania.

• 1850 Census Mercer County

• 1870 Census - Mercer County

  Census Transcription for Mercer County, PA - 1870 complete - all townships and boroughs.

• Ancestry.com - U.S. Federal Census Collection

  Browse by census year, state, county, township. Census images available with fee-based subscription.

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  • 1890 Veterans Schedules

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• Census Online

• Surname Index to the 1870 Census

  Mercer County, Pennsylvania.