| Westlake to Oerlinghausen | 4,069.19 mi (6,548.74 km) |
| Westlake to Oestrich-Winkel | 4,110.25 mi (6,614.81 km) |
| Westlake to Offenburg | 4,160.47 mi (6,695.63 km) |
| Westlake to Oftersheim | 4,154.57 mi (6,686.14 km) |
| Westlake to Ohrdruf | 4,185.58 mi (6,736.05 km) |
| Westlake to Ohringen | 4,196.10 mi (6,752.97 km) |
| Westlake to Olbernhau | 4,288.31 mi (6,901.36 km) |
| Westlake to Olching | 4,302.84 mi (6,924.76 km) |
| Westlake to Oldenburg | 4,013.71 mi (6,459.44 km) |
| Westlake to Oldenburg in Holstein | 4,071.44 mi (6,552.34 km) |
| Westlake to Olfen | 4,029.36 mi (6,484.63 km) |
| Westlake to Olpe | 4,069.55 mi (6,549.31 km) |
| Westlake to Olsberg | 4,082.99 mi (6,570.94 km) |
| Westlake to Oranienburg | 4,208.69 mi (6,773.23 km) |
| Westlake to Ortenberg | 4,138.58 mi (6,660.40 km) |
