Mercer County, Pennsylvania Genealogy

United States &gt; Pennsylvania &gt; Mercer County

Parent County
12 March 1800: Mercer County was created 12 March 1800 from Allegheny County.

Boundary Changes
20 March 1849: Lawrence County set off. Mahoning, Neshannock and Slippery Rock Townships, along with a small portion of Shenango and Lackawannock Townships became part of Lawrence County. This area included the town of New Castle.

Neighboring Counties
Butler | Crawford | Lawrence | Venango | Ohio counties: Mahoning | Trumbull

Maps
1873--Landowner Maps from the Combination Atlas of Mercer County and the State of Pennsylvania, 1873, Mercer County PAGenWeb site.

Web Sites

 * USGenWeb project. May have maps, name indexes, history or other information for this county. Select the state, then the county.
 * Family History Library Catalog