| Middlesex to Jacksonville (North Carolina) | 433.71 mi (697.99 km) |
| Middlesex to Jacksonville (Texas) | 1,296.01 mi (2,085.72 km) |
| Middlesex to Jacksonville Beach (Florida) | 809.98 mi (1,303.54 km) |
| Middlesex to James Island (South Carolina) | 619.54 mi (997.05 km) |
| Middlesex to Jamestown (New York) | 267.22 mi (430.05 km) |
| Middlesex to Jamestown (North Dakota) | 1,278.22 mi (2,057.10 km) |
| Middlesex to Janesville (Wisconsin) | 762.53 mi (1,227.17 km) |
| Middlesex to Jasmine Estates (Florida) | 967.33 mi (1,556.77 km) |
| Middlesex to Jasper (Alabama) | 840.99 mi (1,353.44 km) |
| Middlesex to Jasper (Indiana) | 679.60 mi (1,093.71 km) |
| Middlesex to Jefferson (Georgia) | 668.38 mi (1,075.65 km) |
| Middlesex to Jefferson (Louisiana) | 1,144.73 mi (1,842.26 km) |
| Middlesex to Jefferson City (Missouri) | 949.86 mi (1,528.65 km) |
| Middlesex to Jefferson Hills (Pennsylvania) | 286.28 mi (460.72 km) |
| Middlesex to Jefferson Valley-Yorktown (New York) | 63.05 mi (101.47 km) |
