It was created on March 12, 1800, from part of Allegheny County and named for General Hugh Mercer. It was attached to Crawford County until February 1804 when it was formally organized. Mercer, the county seat, was laid out in 1803 and incorporated as a borough on March 28, 1814.
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The county's rich history presents yet another opportunity, given the increased popularity of heritage-based tourism. The 1996 Mercer County Comprehensive Plan ...
In 1803, the Commonwealth of Pennsylvania designated Mercer as the county seat and established its location, size, and name. The land was a hazel-brush prairie ...
Original data: History of Mercer County, Pennsylvania : its past and present : including its aboriginal history, its early settlement and development, ...