| Difficult Run to Kaneohe (Hawaii) | 4,805.01 mi (7,732.92 km) |
| Difficult Run to Kankakee (Illinois) | 576.62 mi (927.98 km) |
| Difficult Run to Kannapolis (North Carolina) | 298.07 mi (479.70 km) |
| Difficult Run to Kansas City (Kansas) | 932.68 mi (1,501.01 km) |
| Difficult Run to Kansas City (Missouri) | 922.52 mi (1,484.65 km) |
| Difficult Run to Kapaa (Hawaii) | 4,859.90 mi (7,821.26 km) |
| Difficult Run to Kapolei (Hawaii) | 4,822.25 mi (7,760.66 km) |
| Difficult Run to Katy (Texas) | 1,224.71 mi (1,970.99 km) |
| Difficult Run to Kaukauna (Wisconsin) | 674.55 mi (1,085.58 km) |
| Difficult Run to Kaysville (Utah) | 1,826.06 mi (2,938.76 km) |
| Difficult Run to Kearney (Missouri) | 911.04 mi (1,466.18 km) |
| Difficult Run to Kearney (Nebraska) | 1,157.50 mi (1,862.81 km) |
| Difficult Run to Kearns (Utah) | 1,832.67 mi (2,949.39 km) |
| Difficult Run to Kearny (New Jersey) | 213.70 mi (343.92 km) |
| Difficult Run to Keene (New Hampshire) | 384.10 mi (618.15 km) |
