| Boulder to Salisbury (New York) | 1,659.55 mi (2,670.79 km) |
| Boulder to Salisbury (North Carolina) | 1,379.39 mi (2,219.92 km) |
| Boulder to Salmon Creek (Washington) | 962.61 mi (1,549.17 km) |
| Boulder to Salt Lake City (Utah) | 355.15 mi (571.55 km) |
| Boulder to Sammamish (Washington) | 984.12 mi (1,583.80 km) |
| Boulder to San Angelo (Texas) | 651.00 mi (1,047.69 km) |
| Boulder to San Anselmo (California) | 938.94 mi (1,511.08 km) |
| Boulder to San Antonio (Texas) | 823.03 mi (1,324.54 km) |
| Boulder to San Benito (Texas) | 1,055.22 mi (1,698.21 km) |
| Boulder to San Bernardino (California) | 777.27 mi (1,250.90 km) |
| Boulder to San Bruno (California) | 937.90 mi (1,509.41 km) |
| Boulder to San Buenaventura (California) | 864.93 mi (1,391.98 km) |
| Boulder to San Carlos (California) | 931.67 mi (1,499.38 km) |
| Boulder to San Carlos Park (Florida) | 1,637.73 mi (2,635.67 km) |
| Boulder to San Clemente (California) | 820.09 mi (1,319.81 km) |
