| San Marino to Smyrna (Delaware) | 2,359.52 mi (3,797.28 km) |
| San Marino to Smyrna (Georgia) | 1,915.86 mi (3,083.28 km) |
| San Marino to Smyrna (Tennessee) | 1,783.52 mi (2,870.30 km) |
| San Marino to Snellville (Georgia) | 1,944.92 mi (3,130.04 km) |
| San Marino to Snoqualmie (Washington) | 946.31 mi (1,522.94 km) |
| San Marino to Snyder (Texas) | 995.60 mi (1,602.27 km) |
| San Marino to Socastee (South Carolina) | 2,228.68 mi (3,586.72 km) |
| San Marino to Socorro (Texas) | 708.40 mi (1,140.06 km) |
| San Marino to Soddy-Daisy (Tennessee) | 1,864.39 mi (3,000.44 km) |
| San Marino to Solana Beach (California) | 92.21 mi (148.40 km) |
| San Marino to Soledad (California) | 242.64 mi (390.49 km) |
| San Marino to Solon (Ohio) | 2,048.89 mi (3,297.36 km) |
| San Marino to Somers Point (New Jersey) | 2,412.72 mi (3,882.90 km) |
| San Marino to Somerset (Kentucky) | 1,883.41 mi (3,031.06 km) |
| San Marino to Somerset (New Jersey) | 2,411.77 mi (3,881.37 km) |
