Williamson, Pennsylvania

Williamson, Pennsylvania
Unincorporated community
Williamson Show map of Pennsylvania Williamson Williamson (the US) Show map of the US
Coordinates: 39°51′11″N 77°47′51″W / 39.85306°N 77.79750°W / 39.85306; -77.79750Coordinates: 39°51′11″N 77°47′51″W / 39.85306°N 77.79750°W / 39.85306; -77.79750
Country	United States
State	Pennsylvania
County	Franklin
Township	St. Thomas
Elevation	489 ft (149 m)
Time zone	Eastern (EST) (UTC-5)
• Summer (DST)	EDT (UTC-4)
ZIP code	17225
Area code(s)	717
GNIS feature ID	1191484

Williamson is an unincorporated community in St. Thomas Township in Franklin County, Pennsylvania, United States. Williamson is located along Pennsylvania Route 995 northwest of Greencastle and southwest of Chambersburg.

Williamson was platted about 1870. A post office has been in operation at Williamson since 1872.