| Wilmette to Octeville | 3,944.35 mi (6,347.82 km) |
| Wilmette to Oignies | 4,095.55 mi (6,591.15 km) |
| Wilmette to Oissel | 4,061.28 mi (6,536.00 km) |
| Wilmette to Olivet | 4,144.85 mi (6,670.49 km) |
| Wilmette to Ollioules | 4,483.08 mi (7,214.82 km) |
| Wilmette to Olonne-sur-Mer | 4,042.42 mi (6,505.65 km) |
| Wilmette to Oloron-Sainte-Marie | 4,209.93 mi (6,775.23 km) |
| Wilmette to Onet Village | 4,301.13 mi (6,922.01 km) |
| Wilmette to Onnaing | 4,121.33 mi (6,632.64 km) |
| Wilmette to Orange | 4,401.18 mi (7,083.01 km) |
| Wilmette to Orchies | 4,104.87 mi (6,606.14 km) |
| Wilmette to Orleans | 4,143.81 mi (6,668.82 km) |
| Wilmette to Orly | 4,133.02 mi (6,651.45 km) |
| Wilmette to Ormesson-sur-Marne | 4,137.22 mi (6,658.21 km) |
| Wilmette to Orsay | 4,126.60 mi (6,641.12 km) |
