| Ottawa to Smyrna (Delaware) | 709.94 mi (1,142.53 km) |
| Ottawa to Smyrna (Georgia) | 568.66 mi (915.17 km) |
| Ottawa to Smyrna (Tennessee) | 392.28 mi (631.32 km) |
| Ottawa to Snellville (Georgia) | 581.26 mi (935.45 km) |
| Ottawa to Snoqualmie (Washington) | 1,669.73 mi (2,687.18 km) |
| Ottawa to Snyder (Texas) | 893.31 mi (1,437.64 km) |
| Ottawa to Socastee (South Carolina) | 754.13 mi (1,213.65 km) |
| Ottawa to Socorro (Texas) | 1,174.71 mi (1,890.51 km) |
| Ottawa to Soddy-Daisy (Tennessee) | 465.45 mi (749.07 km) |
| Ottawa to Solana Beach (California) | 1,659.28 mi (2,670.36 km) |
| Ottawa to Soledad (California) | 1,770.30 mi (2,849.02 km) |
| Ottawa to Solon (Ohio) | 382.87 mi (616.16 km) |
| Ottawa to Somers Point (New Jersey) | 761.12 mi (1,224.90 km) |
| Ottawa to Somerset (Kentucky) | 371.43 mi (597.75 km) |
| Ottawa to Somerset (New Jersey) | 749.19 mi (1,205.70 km) |
