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