| Middletown to Johnstown (Pennsylvania) | 294.13 mi (473.35 km) |
| Middletown to Joliet (Illinois) | 242.66 mi (390.53 km) |
| Middletown to Jonesboro (Arkansas) | 428.72 mi (689.96 km) |
| Middletown to Joplin (Missouri) | 574.32 mi (924.28 km) |
| Middletown to Joppatowne (Maryland) | 427.42 mi (687.86 km) |
| Middletown to Juana Díaz (Puerto Rico) | 1,827.04 mi (2,940.33 km) |
| Middletown to Junction City (Kansas) | 668.13 mi (1,075.26 km) |
| Middletown to Juneau (Alaska) | 2,530.05 mi (4,071.71 km) |
| Middletown to Jupiter (Florida) | 903.20 mi (1,453.56 km) |
| Middletown to Jupiter Farms (Florida) | 901.42 mi (1,450.70 km) |
| Middletown to Jurupa Valley (California) | 1,860.71 mi (2,994.52 km) |
| Middletown to Justice (Illinois) | 239.07 mi (384.74 km) |
| Middletown to Kahului (Hawaii) | 4,378.16 mi (7,045.96 km) |
| Middletown to Kailua (Hawaii) | 4,425.42 mi (7,122.03 km) |
| Middletown to Kalamazoo (Michigan) | 201.85 mi (324.85 km) |
