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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 Censuses
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1890 Veterans Schedules
Surname Index to the 1870 Census
Mercer County, Pennsylvania.
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