| Biddeford to Oerlinghausen | 3,539.23 mi (5,695.85 km) |
| Biddeford to Oestrich-Winkel | 3,569.04 mi (5,743.81 km) |
| Biddeford to Offenburg | 3,611.89 mi (5,812.78 km) |
| Biddeford to Oftersheim | 3,611.27 mi (5,811.78 km) |
| Biddeford to Ohrdruf | 3,653.14 mi (5,879.16 km) |
| Biddeford to Ohringen | 3,653.51 mi (5,879.76 km) |
| Biddeford to Olbernhau | 3,759.72 mi (6,050.69 km) |
| Biddeford to Olching | 3,758.75 mi (6,049.12 km) |
| Biddeford to Oldenburg | 3,489.55 mi (5,615.89 km) |
| Biddeford to Oldenburg in Holstein | 3,558.51 mi (5,726.86 km) |
| Biddeford to Olfen | 3,495.96 mi (5,626.21 km) |
| Biddeford to Olpe | 3,533.20 mi (5,686.13 km) |
| Biddeford to Olsberg | 3,549.44 mi (5,712.27 km) |
| Biddeford to Oranienburg | 3,691.05 mi (5,940.17 km) |
| Biddeford to Ortenberg | 3,600.88 mi (5,795.05 km) |
