| Duncan to Joliet (Illinois) | 716.95 mi (1,153.83 km) |
| Duncan to Jonesboro (Arkansas) | 418.35 mi (673.26 km) |
| Duncan to Joplin (Missouri) | 259.56 mi (417.73 km) |
| Duncan to Joppatowne (Maryland) | 1,233.92 mi (1,985.81 km) |
| Duncan to Juana Díaz (Puerto Rico) | 2,240.57 mi (3,605.84 km) |
| Duncan to Junction City (Kansas) | 315.62 mi (507.94 km) |
| Duncan to Juneau (Alaska) | 2,337.14 mi (3,761.27 km) |
| Duncan to Jupiter (Florida) | 1,179.05 mi (1,897.50 km) |
| Duncan to Jupiter Farms (Florida) | 1,173.37 mi (1,888.35 km) |
| Duncan to Jurupa Valley (California) | 1,115.09 mi (1,794.57 km) |
| Duncan to Justice (Illinois) | 739.64 mi (1,190.34 km) |
| Duncan to Kahului (Hawaii) | 3,652.53 mi (5,878.18 km) |
| Duncan to Kailua (Hawaii) | 3,708.40 mi (5,968.09 km) |
| Duncan to Kalamazoo (Michigan) | 853.71 mi (1,373.92 km) |
| Duncan to Kalispell (Montana) | 1,265.90 mi (2,037.27 km) |
