| Westbrook to Oerlinghausen | 3,525.53 mi (5,673.80 km) |
| Westbrook to Oestrich-Winkel | 3,555.75 mi (5,722.43 km) |
| Westbrook to Offenburg | 3,598.92 mi (5,791.90 km) |
| Westbrook to Oftersheim | 3,598.07 mi (5,790.54 km) |
| Westbrook to Ohrdruf | 3,639.54 mi (5,857.28 km) |
| Westbrook to Ohringen | 3,640.29 mi (5,858.48 km) |
| Westbrook to Olbernhau | 3,746.00 mi (6,028.61 km) |
| Westbrook to Olching | 3,745.60 mi (6,027.96 km) |
| Westbrook to Oldenburg | 3,475.65 mi (5,593.52 km) |
| Westbrook to Oldenburg in Holstein | 3,544.28 mi (5,703.97 km) |
| Westbrook to Olfen | 3,482.37 mi (5,604.34 km) |
| Westbrook to Olpe | 3,519.72 mi (5,664.45 km) |
| Westbrook to Olsberg | 3,535.87 mi (5,690.43 km) |
| Westbrook to Oranienburg | 3,676.98 mi (5,917.52 km) |
| Westbrook to Ortenberg | 3,587.46 mi (5,773.46 km) |
