| Oconomowoc to Octeville | 3,929.44 mi (6,323.82 km) |
| Oconomowoc to Oignies | 4,077.04 mi (6,561.37 km) |
| Oconomowoc to Oissel | 4,045.34 mi (6,510.34 km) |
| Oconomowoc to Olivet | 4,130.50 mi (6,647.40 km) |
| Oconomowoc to Ollioules | 4,472.48 mi (7,197.77 km) |
| Oconomowoc to Olonne-sur-Mer | 4,032.00 mi (6,488.87 km) |
| Oconomowoc to Oloron-Sainte-Marie | 4,203.43 mi (6,764.77 km) |
| Oconomowoc to Onet Village | 4,291.05 mi (6,905.78 km) |
| Oconomowoc to Onnaing | 4,102.62 mi (6,602.52 km) |
| Oconomowoc to Orange | 4,389.99 mi (7,065.01 km) |
| Oconomowoc to Orchies | 4,086.22 mi (6,576.13 km) |
| Oconomowoc to Orleans | 4,129.40 mi (6,645.63 km) |
| Oconomowoc to Orly | 4,117.19 mi (6,625.98 km) |
| Oconomowoc to Ormesson-sur-Marne | 4,121.25 mi (6,632.52 km) |
| Oconomowoc to Orsay | 4,110.95 mi (6,615.93 km) |
