| Wilmette to Oberkirch | 4,359.99 mi (7,016.73 km) |
| Wilmette to Obernburg am Main | 4,348.89 mi (6,998.86 km) |
| Wilmette to Obernkirchen | 4,255.20 mi (6,848.08 km) |
| Wilmette to Oberschleissheim | 4,501.94 mi (7,245.17 km) |
| Wilmette to Oberstdorf | 4,487.72 mi (7,222.28 km) |
| Wilmette to Obertraubling | 4,494.84 mi (7,233.75 km) |
| Wilmette to Obertshausen | 4,328.77 mi (6,966.49 km) |
| Wilmette to Oberursel | 4,314.09 mi (6,942.85 km) |
| Wilmette to Ochsenfurt | 4,390.38 mi (7,065.63 km) |
| Wilmette to Ochsenhausen | 4,448.58 mi (7,159.30 km) |
| Wilmette to Ochtrup | 4,188.68 mi (6,741.02 km) |
| Wilmette to Odenthal | 4,229.16 mi (6,806.17 km) |
| Wilmette to Oelde | 4,236.91 mi (6,818.65 km) |
| Wilmette to Oelsnitz | 4,435.95 mi (7,138.97 km) |
| Wilmette to Oer-Erkenschwick | 4,211.54 mi (6,777.82 km) |
