| State Line, Franklin County, Pennsylvania | |
| Settlement Type: | Census-designated place |
| Image Blank Emblem: | State Line, PA Keystone Marker 1.jpg |
| Blank Emblem Type: | Keystone Marker |
| Blank Emblem Size: | 250px |
| Blank Emblem Link: | Keystone Markers |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Label: | State Line |
| 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: | Antrim |
| Population As Of: | 2020 |
| Population Total: | 2804 |
| Population Density Km2: | 382.0 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 676 |
| Coordinates: | 39.7417°N -77.725°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 17263 |
| Area Code: | 717 |
| Blank Name: | FIPS code |
| Blank Info: | 42-73848 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2634273 |
State Line is an unincorporated community and census-designated place (CDP) in Antrim Township, Franklin County, Pennsylvania, United States. It is next to the Maryland state line along Interstate 81 and U.S. Route 11 between Hagerstown, Maryland, and Greencastle. As of the 2020 census the population was 2,804.[1]
State Line was originally called Middleburg, and under the latter name laid out in 1812, and named for its location between Greencastle and Hagerstown, Maryland.[2] The present name comes from the fact that the community is located on the Maryland-Pennsylvania state line. A post office called State Line was established in 1830.[3]