| Boulder to Santa Rosa (California) | 938.91 mi (1,511.03 km) |
| Boulder to Santaquin (Utah) | 346.20 mi (557.15 km) |
| Boulder to Santee (California) | 817.73 mi (1,316.02 km) |
| Boulder to Sapulpa (Oklahoma) | 569.81 mi (917.02 km) |
| Boulder to Saraland (Alabama) | 1,151.94 mi (1,853.87 km) |
| Boulder to Sarasota (Florida) | 1,565.18 mi (2,518.92 km) |
| Boulder to Sarasota Springs (Florida) | 1,569.74 mi (2,526.26 km) |
| Boulder to Saratoga (California) | 923.49 mi (1,486.22 km) |
| Boulder to Saratoga Springs (New York) | 1,631.41 mi (2,625.51 km) |
| Boulder to Saratoga Springs (Utah) | 352.32 mi (567.00 km) |
| Boulder to Sartell (Minnesota) | 678.68 mi (1,092.24 km) |
| Boulder to Satellite Beach (Florida) | 1,622.44 mi (2,611.06 km) |
| Boulder to Sauk Rapids (Minnesota) | 680.73 mi (1,095.53 km) |
| Boulder to Sault Ste. Marie (Michigan) | 1,137.13 mi (1,830.03 km) |
| Boulder to Savage (Minnesota) | 688.16 mi (1,107.48 km) |
