| Centennial to Oerlinghausen | 4,960.57 mi (7,983.26 km) |
| Centennial to Oestrich-Winkel | 5,029.88 mi (8,094.81 km) |
| Centennial to Offenburg | 5,098.73 mi (8,205.61 km) |
| Centennial to Oftersheim | 5,078.47 mi (8,173.00 km) |
| Centennial to Ohrdruf | 5,079.36 mi (8,174.45 km) |
| Centennial to Ohringen | 5,116.74 mi (8,234.60 km) |
| Centennial to Olbernhau | 5,168.37 mi (8,317.69 km) |
| Centennial to Olching | 5,224.35 mi (8,407.79 km) |
| Centennial to Oldenburg | 4,892.30 mi (7,873.39 km) |
| Centennial to Oldenburg in Holstein | 4,919.73 mi (7,917.54 km) |
| Centennial to Olfen | 4,931.04 mi (7,935.74 km) |
| Centennial to Olpe | 4,977.59 mi (8,010.65 km) |
| Centennial to Olsberg | 4,983.22 mi (8,019.71 km) |
| Centennial to Oranienburg | 5,063.40 mi (8,148.76 km) |
| Centennial to Ortenberg | 5,047.89 mi (8,123.79 km) |
