| Delaware to Joliet (Illinois) | 278.39 mi (448.03 km) |
| Delaware to Jonesboro (Arkansas) | 515.74 mi (830.00 km) |
| Delaware to Joplin (Missouri) | 654.46 mi (1,053.24 km) |
| Delaware to Joppatowne (Maryland) | 361.49 mi (581.76 km) |
| Delaware to Juana Díaz (Puerto Rico) | 1,825.58 mi (2,937.98 km) |
| Delaware to Junction City (Kansas) | 737.21 mi (1,186.42 km) |
| Delaware to Juneau (Alaska) | 2,536.49 mi (4,082.08 km) |
| Delaware to Jupiter (Florida) | 938.87 mi (1,510.96 km) |
| Delaware to Jupiter Farms (Florida) | 937.64 mi (1,508.99 km) |
| Delaware to Jurupa Valley (California) | 1,930.69 mi (3,107.14 km) |
| Delaware to Justice (Illinois) | 267.95 mi (431.23 km) |
| Delaware to Kahului (Hawaii) | 4,440.49 mi (7,146.29 km) |
| Delaware to Kailua (Hawaii) | 4,486.43 mi (7,220.21 km) |
| Delaware to Kalamazoo (Michigan) | 189.57 mi (305.08 km) |
| Delaware to Kalispell (Montana) | 1,627.53 mi (2,619.26 km) |
