Mercer County - Original Geography

The following describes the territory from which Mercer County was originally formed.
Chester County was one of the original counties of the province.
May 10, 1729 : Lancaster County formed from part of Chester County.
January 27, 1750: Cumberland County formed from part of Lancaster County.
March 9, 1771: Bedford County formed from part of Cumberland County.
February 26, 1773: Westmoreland County formed from part of Bedford County.
October 1784: The region covering about twenty counties in the northwestern part of Pennsylvania was purchased from the Six Nations by the Commonwealth, at the treaty of Fort Stanwix (now Rome, N.Y.) .
1785: A part of the purchase of 1784 was added.
September 24, 1788: Allegheny County formed from parts of Westmoreland and Washington Counties.
March 12, 1800: Beaver and Mercer Counties formed from part of Allegheny County.
April 5, 1849: Lawrence County created from parts of Beaver and Mercer Counties.

Source: Twentieth Century History of New Castle and Lawrence County, Pennsylvania

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