| Potomac to Jeffersontown (Kentucky) | 455.49 mi (733.04 km) |
| Potomac to Jeffersonville (Indiana) | 461.15 mi (742.14 km) |
| Potomac to Jenison (Michigan) | 524.20 mi (843.61 km) |
| Potomac to Jenks (Oklahoma) | 1,048.19 mi (1,686.89 km) |
| Potomac to Jennings (Missouri) | 702.79 mi (1,131.03 km) |
| Potomac to Jensen Beach (Florida) | 832.01 mi (1,338.99 km) |
| Potomac to Jericho (New York) | 229.10 mi (368.69 km) |
| Potomac to Jerome (Idaho) | 1,950.76 mi (3,139.44 km) |
| Potomac to Jersey City (New Jersey) | 203.31 mi (327.19 km) |
| Potomac to Jessup (Maryland) | 24.23 mi (38.99 km) |
| Potomac to Johns Creek (Georgia) | 519.17 mi (835.53 km) |
| Potomac to Johnson City (New York) | 224.32 mi (361.00 km) |
| Potomac to Johnson City (Tennessee) | 338.37 mi (544.56 km) |
| Potomac to Johnston (Iowa) | 888.27 mi (1,429.54 km) |
| Potomac to Johnstown (Colorado) | 1,472.63 mi (2,369.96 km) |
