| Difficult Run to Joliet (Illinois) | 597.52 mi (961.62 km) |
| Difficult Run to Jonesboro (Arkansas) | 761.64 mi (1,225.74 km) |
| Difficult Run to Joplin (Missouri) | 941.21 mi (1,514.73 km) |
| Difficult Run to Joppatowne (Maryland) | 64.17 mi (103.27 km) |
| Difficult Run to Juana Díaz (Puerto Rico) | 1,580.91 mi (2,544.23 km) |
| Difficult Run to Junction City (Kansas) | 1,045.81 mi (1,683.07 km) |
| Difficult Run to Juneau (Alaska) | 2,813.13 mi (4,527.29 km) |
| Difficult Run to Jupiter (Florida) | 843.12 mi (1,356.87 km) |
| Difficult Run to Jupiter Farms (Florida) | 844.16 mi (1,358.54 km) |
| Difficult Run to Jurupa Valley (California) | 2,237.29 mi (3,600.57 km) |
| Difficult Run to Justice (Illinois) | 585.95 mi (943.00 km) |
| Difficult Run to Kahului (Hawaii) | 4,755.96 mi (7,653.98 km) |
| Difficult Run to Kailua (Hawaii) | 4,802.90 mi (7,729.52 km) |
| Difficult Run to Kalamazoo (Michigan) | 490.91 mi (790.04 km) |
| Difficult Run to Kalispell (Montana) | 1,938.34 mi (3,119.46 km) |
