History and Genealogy of
Mercer County, Pennsylvania
Cities within the
The county seat is:
Welcome to Mercer County, Pennsylvania
Part of the Genealogy Trails History Group
Volunteers dedicated to putting Historical and Genealogical
information online for the FREE use of all researchers.
Mercer County is located in northwestern
Pennsylvania, along the Ohio border.
Mercer's adjacent counties are:
Crawford, Venango, Butler, Lawrence, Mahoning (Ohio), Trumbull (Ohio)