| Castricum to Ridgeland (Mississippi) | 4,664.25 mi (7,506.38 km) |
| Castricum to Ridgewood (New Jersey) | 3,621.36 mi (5,828.01 km) |
| Castricum to Rifle (Colorado) | 4,902.33 mi (7,889.54 km) |
| Castricum to Rincon (Georgia) | 4,322.19 mi (6,955.89 km) |
| Castricum to Ringwood (New Jersey) | 3,622.07 mi (5,829.15 km) |
| Castricum to Río Grande (Puerto Rico) | 4,402.07 mi (7,084.45 km) |
| Castricum to Rio Grande City (Texas) | 5,317.18 mi (8,557.17 km) |
| Castricum to Rio Linda (California) | 5,354.39 mi (8,617.06 km) |
| Castricum to Rio Rancho (New Mexico) | 5,104.05 mi (8,214.18 km) |
| Castricum to Rio Rico (Arizona) | 5,460.54 mi (8,787.89 km) |
| Castricum to Ripon (California) | 5,402.36 mi (8,694.25 km) |
| Castricum to River Edge (New Jersey) | 3,620.96 mi (5,827.38 km) |
| Castricum to River Falls (Wisconsin) | 4,121.35 mi (6,632.68 km) |
| Castricum to River Forest (Illinois) | 4,097.45 mi (6,594.20 km) |
| Castricum to River Grove (Illinois) | 4,096.69 mi (6,592.98 km) |
