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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.
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Census Transcription for Mercer County, PA - 1870 complete - all townships and boroughs.
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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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Surname Index to the 1870 Census
Mercer County, Pennsylvania.
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United States » Pennsylvania » Counties » Mercer » Census
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See also: U.S. Census