| Clay Cross to Oerlinghausen | 430.95 mi (693.54 km) |
| Clay Cross to Oestrich-Winkel | 458.95 mi (738.62 km) |
| Clay Cross to Offenburg | 520.62 mi (837.86 km) |
| Clay Cross to Oftersheim | 504.79 mi (812.37 km) |
| Clay Cross to Ohrdruf | 540.54 mi (869.91 km) |
| Clay Cross to Ohringen | 545.42 mi (877.77 km) |
| Clay Cross to Olbernhau | 650.39 mi (1,046.70 km) |
| Clay Cross to Olching | 652.97 mi (1,050.85 km) |
| Clay Cross to Oldenburg | 398.57 mi (641.43 km) |
| Clay Cross to Oldenburg in Holstein | 508.00 mi (817.55 km) |
| Clay Cross to Olfen | 383.45 mi (617.11 km) |
| Clay Cross to Olpe | 419.24 mi (674.70 km) |
| Clay Cross to Olsberg | 436.49 mi (702.46 km) |
| Clay Cross to Oranienburg | 609.32 mi (980.61 km) |
| Clay Cross to Ortenberg | 487.32 mi (784.26 km) |
