| Difficult Run to Jacksonville (Texas) | 1,113.99 mi (1,792.79 km) |
| Difficult Run to Jacksonville Beach (Florida) | 638.76 mi (1,027.98 km) |
| Difficult Run to James Island (South Carolina) | 450.07 mi (724.31 km) |
| Difficult Run to Jamestown (New York) | 242.10 mi (389.61 km) |
| Difficult Run to Jamestown (North Dakota) | 1,208.29 mi (1,944.55 km) |
| Difficult Run to Janesville (Wisconsin) | 663.15 mi (1,067.23 km) |
| Difficult Run to Jasmine Estates (Florida) | 794.47 mi (1,278.58 km) |
| Difficult Run to Jasper (Alabama) | 652.51 mi (1,050.12 km) |
| Difficult Run to Jasper (Indiana) | 518.61 mi (834.63 km) |
| Difficult Run to Jefferson (Georgia) | 478.30 mi (769.74 km) |
| Difficult Run to Jefferson (Louisiana) | 954.50 mi (1,536.12 km) |
| Difficult Run to Jefferson City (Missouri) | 798.67 mi (1,285.34 km) |
| Difficult Run to Jefferson Hills (Pennsylvania) | 167.88 mi (270.18 km) |
| Difficult Run to Jefferson Valley-Yorktown (New York) | 250.94 mi (403.85 km) |
| Difficult Run to Jeffersontown (Kentucky) | 446.76 mi (718.99 km) |
