| Castricum to Orangevale (California) | 5,348.35 mi (8,607.34 km) |
| Castricum to Orchards (Washington) | 4,965.33 mi (7,990.92 km) |
| Castricum to Orcutt (California) | 5,553.86 mi (8,938.08 km) |
| Castricum to Oregon (Ohio) | 3,947.48 mi (6,352.86 km) |
| Castricum to Oregon (Wisconsin) | 4,103.52 mi (6,603.97 km) |
| Castricum to Oregon City (Oregon) | 4,987.50 mi (8,026.60 km) |
| Castricum to Orem (Utah) | 4,981.05 mi (8,016.23 km) |
| Castricum to Orinda (California) | 5,422.65 mi (8,726.92 km) |
| Castricum to Orland Park (Illinois) | 4,113.07 mi (6,619.34 km) |
| Castricum to Orlando (Florida) | 4,520.87 mi (7,275.64 km) |
| Castricum to Ormond Beach (Florida) | 4,469.16 mi (7,192.42 km) |
| Castricum to Oro Valley (Arizona) | 5,407.16 mi (8,701.98 km) |
| Castricum to Oroville (California) | 5,309.18 mi (8,544.29 km) |
| Castricum to Oshkosh (Wisconsin) | 4,020.66 mi (6,470.62 km) |
| Castricum to Oskaloosa (Iowa) | 4,300.34 mi (6,920.73 km) |
