| Middle River to Smyrna (Delaware) | 43.81 mi (70.50 km) |
| Middle River to Smyrna (Georgia) | 586.75 mi (944.29 km) |
| Middle River to Smyrna (Tennessee) | 599.27 mi (964.44 km) |
| Middle River to Snellville (Georgia) | 565.70 mi (910.40 km) |
| Middle River to Snoqualmie (Washington) | 2,312.53 mi (3,721.65 km) |
| Middle River to Snyder (Texas) | 1,437.55 mi (2,313.51 km) |
| Middle River to Socastee (South Carolina) | 416.27 mi (669.92 km) |
| Middle River to Socorro (Texas) | 1,751.54 mi (2,818.84 km) |
| Middle River to Soddy-Daisy (Tennessee) | 557.22 mi (896.76 km) |
| Middle River to Solana Beach (California) | 2,299.37 mi (3,700.47 km) |
| Middle River to Soledad (California) | 2,432.14 mi (3,914.14 km) |
| Middle River to Solon (Ohio) | 299.29 mi (481.66 km) |
| Middle River to Somers Point (New Jersey) | 97.21 mi (156.45 km) |
| Middle River to Somerset (Kentucky) | 470.80 mi (757.68 km) |
| Middle River to Somerset (New Jersey) | 129.89 mi (209.03 km) |
