| Boulder to Shoreview (Minnesota) | 707.80 mi (1,139.10 km) |
| Boulder to Shorewood (Illinois) | 895.99 mi (1,441.95 km) |
| Boulder to Shorewood (Wisconsin) | 920.68 mi (1,481.69 km) |
| Boulder to Short Hills (New Jersey) | 1,619.90 mi (2,606.98 km) |
| Boulder to Short Pump (Virginia) | 1,490.05 mi (2,398.01 km) |
| Boulder to Show Low (Arizona) | 477.04 mi (767.71 km) |
| Boulder to Shreveport (Louisiana) | 823.63 mi (1,325.50 km) |
| Boulder to Sicklerville (New Jersey) | 1,596.59 mi (2,569.46 km) |
| Boulder to Sidney (Ohio) | 1,110.98 mi (1,787.95 km) |
| Boulder to Sierra Madre (California) | 811.93 mi (1,306.67 km) |
| Boulder to Sierra Vista (Arizona) | 649.57 mi (1,045.38 km) |
| Boulder to Sierra Vista Southeast (Arizona) | 654.15 mi (1,052.75 km) |
| Boulder to Signal Hill (California) | 831.72 mi (1,338.52 km) |
| Boulder to Sikeston (Missouri) | 873.59 mi (1,405.91 km) |
| Boulder to Siloam Springs (Arkansas) | 639.86 mi (1,029.75 km) |
