Pen Mar, Pennsylvania

Pen Mar is an unincorporated community and census-designated place (CDP) that is located in Washington Township, Franklin County, Pennsylvania, United States. It is situated on the Mason–Dixon line, bordered to the south by the community of Pen Mar Park in Maryland.

History
The community's name is a portmanteau of "Pennsylvania" and "Maryland".

Geography
Pen Mar is located in southeastern Franklin County, on the western slope of South Mountain. Pennsylvania Route 550 is the main road through the community, leading northwest down the mountain 2 mi to Rouzerville. Waynesboro is 4.5 mi northwest of Pen Mar, and the site of the former Fort Ritchie in Maryland is 1 mi to the southeast.

Demographics
As of the 2020 census, the population of Pen Mar was 947.