| Difficult Run to Rancho Cordova (California) | 2,342.92 mi (3,770.57 km) |
| Difficult Run to Rancho Cucamonga (California) | 2,239.46 mi (3,604.06 km) |
| Difficult Run to Rancho Mirage (California) | 2,187.08 mi (3,519.76 km) |
| Difficult Run to Rancho Palos Verdes (California) | 2,291.19 mi (3,687.32 km) |
| Difficult Run to Rancho San Diego (California) | 2,238.96 mi (3,603.26 km) |
| Difficult Run to Rancho Santa Margarita (California) | 2,253.23 mi (3,626.23 km) |
| Difficult Run to Randallstown (Maryland) | 43.70 mi (70.33 km) |
| Difficult Run to Rantoul (Illinois) | 583.06 mi (938.35 km) |
| Difficult Run to Rapid City (South Dakota) | 1,379.64 mi (2,220.31 km) |
| Difficult Run to Ravenna (Ohio) | 258.48 mi (415.99 km) |
| Difficult Run to Raymondville (Texas) | 1,460.00 mi (2,349.64 km) |
| Difficult Run to Raymore (Missouri) | 919.38 mi (1,479.60 km) |
| Difficult Run to Raytown (Missouri) | 918.45 mi (1,478.10 km) |
| Difficult Run to Reading (Ohio) | 380.71 mi (612.70 km) |
| Difficult Run to Reading (Pennsylvania) | 124.86 mi (200.95 km) |
