| San Mateo to Smyrna (Delaware) | 2,502.65 mi (4,027.63 km) |
| San Mateo to Smyrna (Georgia) | 2,121.44 mi (3,414.12 km) |
| San Mateo to Smyrna (Tennessee) | 1,971.93 mi (3,173.52 km) |
| San Mateo to Snellville (Georgia) | 2,149.59 mi (3,459.43 km) |
| San Mateo to Snoqualmie (Washington) | 689.76 mi (1,110.07 km) |
| San Mateo to Snyder (Texas) | 1,251.50 mi (2,014.09 km) |
| San Mateo to Socastee (South Carolina) | 2,425.40 mi (3,903.30 km) |
| San Mateo to Socorro (Texas) | 998.47 mi (1,606.87 km) |
| San Mateo to Soddy-Daisy (Tennessee) | 2,057.92 mi (3,311.91 km) |
| San Mateo to Solana Beach (California) | 424.67 mi (683.45 km) |
| San Mateo to Soledad (California) | 93.45 mi (150.40 km) |
| San Mateo to Solon (Ohio) | 2,175.76 mi (3,501.54 km) |
| San Mateo to Somers Point (New Jersey) | 2,554.56 mi (4,111.16 km) |
| San Mateo to Somerset (Kentucky) | 2,057.79 mi (3,311.69 km) |
| San Mateo to Somerset (New Jersey) | 2,542.81 mi (4,092.26 km) |
