| Simi Valley to Sestu | 6,359.83 mi (10,235.15 km) |
| Simi Valley to Settimo Torinese | 6,011.91 mi (9,675.23 km) |
| Simi Valley to Seveso | 6,029.24 mi (9,703.12 km) |
| Simi Valley to Sezze | 6,375.21 mi (10,259.91 km) |
| Simi Valley to Siano | 6,465.00 mi (10,404.40 km) |
| Simi Valley to Siena | 6,221.81 mi (10,013.04 km) |
| Simi Valley to Signa | 6,189.61 mi (9,961.21 km) |
| Simi Valley to Silea | 6,126.04 mi (9,858.91 km) |
| Simi Valley to Silvi Paese | 6,350.74 mi (10,220.52 km) |
| Simi Valley to Sinalunga | 6,240.01 mi (10,042.32 km) |
| Simi Valley to Siniscola | 6,313.73 mi (10,160.97 km) |
| Simi Valley to Sinnai | 6,363.54 mi (10,241.13 km) |
| Simi Valley to Siracusa | 6,690.53 mi (10,767.37 km) |
| Simi Valley to Solaro | 6,029.03 mi (9,702.79 km) |
| Simi Valley to Soliera | 6,133.15 mi (9,870.35 km) |
