| Castleton to Oerlinghausen | 466.25 mi (750.35 km) |
| Castleton to Oestrich-Winkel | 499.89 mi (804.49 km) |
| Castleton to Offenburg | 563.22 mi (906.41 km) |
| Castleton to Oftersheim | 546.25 mi (879.10 km) |
| Castleton to Ohrdruf | 577.84 mi (929.95 km) |
| Castleton to Ohringen | 586.56 mi (943.98 km) |
| Castleton to Olbernhau | 686.46 mi (1,104.76 km) |
| Castleton to Olching | 694.26 mi (1,117.30 km) |
| Castleton to Oldenburg | 428.97 mi (690.37 km) |
| Castleton to Oldenburg in Holstein | 532.45 mi (856.90 km) |
| Castleton to Olfen | 420.60 mi (676.88 km) |
| Castleton to Olpe | 458.16 mi (737.34 km) |
| Castleton to Olsberg | 473.97 mi (762.78 km) |
| Castleton to Oranienburg | 639.57 mi (1,029.30 km) |
| Castleton to Ortenberg | 526.86 mi (847.89 km) |
