| Houston to Smyrna (Delaware) | 1,299.14 mi (2,090.76 km) |
| Houston to Smyrna (Georgia) | 697.13 mi (1,121.93 km) |
| Houston to Smyrna (Tennessee) | 667.98 mi (1,075.01 km) |
| Houston to Snellville (Georgia) | 724.57 mi (1,166.08 km) |
| Houston to Snoqualmie (Washington) | 1,864.90 mi (3,001.26 km) |
| Houston to Snyder (Texas) | 383.76 mi (617.60 km) |
| Houston to Socastee (South Carolina) | 998.28 mi (1,606.58 km) |
| Houston to Socorro (Texas) | 658.05 mi (1,059.04 km) |
| Houston to Soddy-Daisy (Tennessee) | 704.39 mi (1,133.60 km) |
| Houston to Solana Beach (California) | 1,306.29 mi (2,102.27 km) |
| Houston to Soledad (California) | 1,565.28 mi (2,519.07 km) |
| Houston to Solon (Ohio) | 1,118.19 mi (1,799.55 km) |
| Houston to Somers Point (New Jersey) | 1,348.86 mi (2,170.78 km) |
| Houston to Somerset (Kentucky) | 799.28 mi (1,286.31 km) |
| Houston to Somerset (New Jersey) | 1,387.84 mi (2,233.51 km) |
