| Ballwin to Oerlinghausen | 4,527.68 mi (7,286.59 km) |
| Ballwin to Oestrich-Winkel | 4,575.57 mi (7,363.67 km) |
| Ballwin to Offenburg | 4,630.17 mi (7,451.54 km) |
| Ballwin to Oftersheim | 4,621.05 mi (7,436.86 km) |
| Ballwin to Ohrdruf | 4,645.19 mi (7,475.70 km) |
| Ballwin to Ohringen | 4,662.01 mi (7,502.77 km) |
| Ballwin to Olbernhau | 4,745.08 mi (7,636.47 km) |
| Ballwin to Olching | 4,769.37 mi (7,675.56 km) |
| Ballwin to Oldenburg | 4,468.78 mi (7,191.81 km) |
| Ballwin to Oldenburg in Holstein | 4,519.14 mi (7,272.86 km) |
| Ballwin to Olfen | 4,490.13 mi (7,226.17 km) |
| Ballwin to Olpe | 4,532.01 mi (7,293.56 km) |
| Ballwin to Olsberg | 4,543.66 mi (7,312.32 km) |
| Ballwin to Oranienburg | 4,658.78 mi (7,497.58 km) |
| Ballwin to Ortenberg | 4,601.64 mi (7,405.62 km) |
