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).

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. Of these, 12 are listed as Missing. Latitude and longitude coordinates are given as provided by the PHMC's database.