| Castricum to Smyrna (Delaware) | 3,758.04 mi (6,047.98 km) |
| Castricum to Smyrna (Georgia) | 4,372.55 mi (7,036.93 km) |
| Castricum to Smyrna (Tennessee) | 4,343.79 mi (6,990.65 km) |
| Castricum to Snellville (Georgia) | 4,352.85 mi (7,005.23 km) |
| Castricum to Snoqualmie (Washington) | 4,839.47 mi (7,788.38 km) |
| Castricum to Snyder (Texas) | 5,046.82 mi (8,122.07 km) |
| Castricum to Socastee (South Carolina) | 4,163.53 mi (6,700.56 km) |
| Castricum to Socorro (Texas) | 5,293.44 mi (8,518.97 km) |
| Castricum to Soddy-Daisy (Tennessee) | 4,327.70 mi (6,964.76 km) |
| Castricum to Solana Beach (California) | 5,571.72 mi (8,966.82 km) |
| Castricum to Soledad (California) | 5,485.80 mi (8,828.54 km) |
| Castricum to Solon (Ohio) | 3,885.21 mi (6,252.64 km) |
| Castricum to Somers Point (New Jersey) | 3,717.40 mi (5,982.57 km) |
| Castricum to Somerset (Kentucky) | 4,214.69 mi (6,782.89 km) |
| Castricum to Somerset (New Jersey) | 3,658.25 mi (5,887.38 km) |
