| Middlesex to Jeffersontown (Kentucky) | 612.84 mi (986.28 km) |
| Middlesex to Jeffersonville (Indiana) | 616.75 mi (992.57 km) |
| Middlesex to Jenison (Michigan) | 605.19 mi (973.96 km) |
| Middlesex to Jenks (Oklahoma) | 1,203.28 mi (1,936.49 km) |
| Middlesex to Jennings (Missouri) | 847.12 mi (1,363.31 km) |
| Middlesex to Jensen Beach (Florida) | 977.52 mi (1,573.17 km) |
| Middlesex to Jericho (New York) | 52.39 mi (84.31 km) |
| Middlesex to Jerome (Idaho) | 2,051.94 mi (3,302.27 km) |
| Middlesex to Jersey City (New Jersey) | 24.76 mi (39.85 km) |
| Middlesex to Jessup (Maryland) | 155.79 mi (250.72 km) |
| Middlesex to Johns Creek (Georgia) | 698.18 mi (1,123.61 km) |
| Middlesex to Johnson City (New York) | 131.12 mi (211.02 km) |
| Middlesex to Johnson City (Tennessee) | 516.69 mi (831.53 km) |
| Middlesex to Johnston (Iowa) | 1,001.22 mi (1,611.30 km) |
| Middlesex to Johnstown (Colorado) | 1,592.58 mi (2,563.02 km) |
