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Pennsylvania Counties

Mercer County

Mercer County was named for General Hugh Mercer and created on March 12, 1800, from part of Allegheny County. It was formally organized in February 1804 when it was detached from Crawford County. The county seat is Mercer, laid out in 1803, and incorporated as a borough on March 28, 1814.

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History of Mercer County

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Township Map of Mercer County, Pa.

Map of Mercer County, Pennsylvania, United States with township and municipal boundaries is taken from US Census website and modified by Ruhrfisch in April 2006.

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