List of Pennsylvania state historical markers in Mercer County

This is a list of the Pennsylvania state historical markers in Mercer County.
This is intended to be a complete list of the official state historical markers placed in Mercer County, Pennsylvania by the Pennsylvania Historical and Museum Commission (PHMC). The locations of the historical markers, as well as the latitude and longitude coordinates as provided by the PHMC's database, are included below when available. There are 19 historical markers located in Mercer County.