| Pen Mar, Pennsylvania | |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Label: | Pen Mar |
| Pushpin Label Position: | top |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Pennsylvania |
| Subdivision Type2: | County |
| Subdivision Name2: | Franklin |
| Subdivision Type3: | Township |
| Subdivision Name3: | Washington |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.93 |
| Area Land Km2: | 1.91 |
| Area Water Km2: | 0.02 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 947 |
| Population Density Km2: | 495.04 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 899 |
| Coordinates: | 39.7228°N -77.5097°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 17268 |
| Blank Name: | FIPS code |
| Blank Info: | 42-58776 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2634268 |
| Area Total Sq Mi: | 0.75 |
| Area Land Sq Mi: | 0.74 |
| Area Water Sq Mi: | 0.01 |
| Population Density Sq Mi: | 1281.46 |
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.
The community's name is a portmanteau of "Pennsylvania" and "Maryland".[3]
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 2miles to Rouzerville. Waynesboro is northwest of Pen Mar, and the site of the former Fort Ritchie in Maryland is to the southeast.
As of the 2020 census, the population of Pen Mar was 947.[4]