| Ballwin to Octeville | 4,214.26 mi (6,782.20 km) |
| Ballwin to Oignies | 4,368.87 mi (7,031.02 km) |
| Ballwin to Oissel | 4,332.18 mi (6,971.96 km) |
| Ballwin to Olivet | 4,414.05 mi (7,103.72 km) |
| Ballwin to Ollioules | 4,747.75 mi (7,640.77 km) |
| Ballwin to Olonne-sur-Mer | 4,307.20 mi (6,931.77 km) |
| Ballwin to Oloron-Sainte-Marie | 4,469.51 mi (7,192.99 km) |
| Ballwin to Onet Village | 4,565.30 mi (7,347.14 km) |
| Ballwin to Onnaing | 4,394.82 mi (7,072.79 km) |
| Ballwin to Orange | 4,666.62 mi (7,510.20 km) |
| Ballwin to Orchies | 4,378.31 mi (7,046.20 km) |
| Ballwin to Orleans | 4,413.07 mi (7,102.15 km) |
| Ballwin to Orly | 4,403.75 mi (7,087.16 km) |
| Ballwin to Ormesson-sur-Marne | 4,408.09 mi (7,094.14 km) |
| Ballwin to Orsay | 4,397.16 mi (7,076.54 km) |
