| Difficult Run to Sumter (South Carolina) | 382.34 mi (615.32 km) |
| Difficult Run to Sun City (Arizona) | 1,967.91 mi (3,167.04 km) |
| Difficult Run to Sun City Center (Florida) | 824.90 mi (1,327.55 km) |
| Difficult Run to Sun City West (Arizona) | 1,970.66 mi (3,171.47 km) |
| Difficult Run to Sun Lakes (Arizona) | 1,955.71 mi (3,147.41 km) |
| Difficult Run to Sun Prairie (Wisconsin) | 685.69 mi (1,103.51 km) |
| Difficult Run to Sun Valley (Nevada) | 2,249.11 mi (3,619.60 km) |
| Difficult Run to Sun Village (California) | 2,250.00 mi (3,621.03 km) |
| Difficult Run to Sunland Park (New Mexico) | 1,710.80 mi (2,753.26 km) |
| Difficult Run to Sunny Isles Beach (Florida) | 910.06 mi (1,464.60 km) |
| Difficult Run to Sunnyside (Washington) | 2,200.74 mi (3,541.75 km) |
| Difficult Run to Sunnyvale (California) | 2,405.62 mi (3,871.47 km) |
| Difficult Run to Sunrise (Florida) | 897.21 mi (1,443.92 km) |
| Difficult Run to Sunrise Manor (Nevada) | 2,059.40 mi (3,314.29 km) |
| Difficult Run to Sunset (Florida) | 928.31 mi (1,493.97 km) |
