| Gaithersburg to Jacksonville (Texas) | 1,126.31 mi (1,812.62 km) |
| Gaithersburg to Jacksonville Beach (Florida) | 656.38 mi (1,056.35 km) |
| Gaithersburg to James Island (South Carolina) | 467.65 mi (752.61 km) |
| Gaithersburg to Jamestown (New York) | 230.58 mi (371.08 km) |
| Gaithersburg to Jamestown (North Dakota) | 1,205.31 mi (1,939.76 km) |
| Gaithersburg to Janesville (Wisconsin) | 662.49 mi (1,066.17 km) |
| Gaithersburg to Jasmine Estates (Florida) | 812.11 mi (1,306.96 km) |
| Gaithersburg to Jasper (Alabama) | 666.73 mi (1,073.00 km) |
| Gaithersburg to Jasper (Indiana) | 526.28 mi (846.97 km) |
| Gaithersburg to Jefferson (Georgia) | 494.41 mi (795.67 km) |
| Gaithersburg to Jefferson (Louisiana) | 969.89 mi (1,560.88 km) |
| Gaithersburg to Jefferson City (Missouri) | 805.16 mi (1,295.79 km) |
| Gaithersburg to Jefferson Hills (Pennsylvania) | 165.21 mi (265.88 km) |
| Gaithersburg to Jefferson Valley-Yorktown (New York) | 234.83 mi (377.92 km) |
| Gaithersburg to Jeffersontown (Kentucky) | 455.21 mi (732.58 km) |
