| Boulder to Sabadell | 5,195.38 mi (8,361.15 km) |
| Boulder to Sabinanigo | 5,055.19 mi (8,135.54 km) |
| Boulder to Sagunto | 5,184.27 mi (8,343.28 km) |
| Boulder to Salamanca | 4,906.69 mi (7,896.56 km) |
| Boulder to Salobrena | 5,174.30 mi (8,327.24 km) |
| Boulder to Salou | 5,178.08 mi (8,333.31 km) |
| Boulder to Salt | 5,202.44 mi (8,372.51 km) |
| Boulder to Salvatierra de Mino | 4,742.67 mi (7,632.59 km) |
| Boulder to Sama | 4,809.54 mi (7,740.21 km) |
| Boulder to San Adrian de Besos | 5,205.04 mi (8,376.71 km) |
| Boulder to San Agustin de Guadalix | 5,003.71 mi (8,052.69 km) |
| Boulder to San Andres de la Barca | 5,194.81 mi (8,360.24 km) |
| Boulder to San Andres de Llevaneras | 5,208.89 mi (8,382.90 km) |
| Boulder to San Andres del Rabanedo | 4,840.98 mi (7,790.81 km) |
| Boulder to San Bartolome | 4,991.56 mi (8,033.14 km) |
