| Castricum to Silver Firs (Washington) | 4,827.19 mi (7,768.61 km) |
| Castricum to Silver Spring (Maryland) | 3,827.24 mi (6,159.34 km) |
| Castricum to Silver Springs Shores (Florida) | 4,515.58 mi (7,267.12 km) |
| Castricum to Silverdale (Washington) | 4,851.64 mi (7,807.95 km) |
| Castricum to Silverton (Oregon) | 5,012.33 mi (8,066.56 km) |
| Castricum to Simi Valley (California) | 5,541.15 mi (8,917.62 km) |
| Castricum to Simpsonville (South Carolina) | 4,240.54 mi (6,824.49 km) |
| Castricum to Sioux City (Iowa) | 4,369.20 mi (7,031.54 km) |
| Castricum to Sioux Falls (South Dakota) | 4,327.19 mi (6,963.93 km) |
| Castricum to Skokie (Illinois) | 4,087.67 mi (6,578.47 km) |
| Castricum to Sleepy Hollow (New York) | 3,606.85 mi (5,804.66 km) |
| Castricum to Slidell (Louisiana) | 4,761.93 mi (7,663.58 km) |
| Castricum to Smithfield (North Carolina) | 4,047.33 mi (6,513.54 km) |
| Castricum to Smithfield (Utah) | 4,897.92 mi (7,882.45 km) |
| Castricum to Smithville (Missouri) | 4,466.00 mi (7,187.33 km) |
