List of Pennsylvania state historical markers in Philadelphia County
This is intended to be a complete list of the Pennsylvania state historical markers in Philadelphia County, as placed by the Pennsylvania Historical and Museum Commission (PHMC) in the U.S. state of Pennsylvania. As of 2021, there were 321 combined Roadside (larger) and City (narrower) markers affixed on posts and Plaque markers affixed to buildings or structures in Philadelphia County, Pennsylvania, which is coterminous with the city of Philadelphia.