| McHenry to Octeville | 3,955.05 mi (6,365.05 km) |
| McHenry to Oignies | 4,104.78 mi (6,606.01 km) |
| McHenry to Oissel | 4,071.57 mi (6,552.56 km) |
| McHenry to Olivet | 4,155.80 mi (6,688.11 km) |
| McHenry to Ollioules | 4,495.55 mi (7,234.89 km) |
| McHenry to Olonne-sur-Mer | 4,054.93 mi (6,525.78 km) |
| McHenry to Oloron-Sainte-Marie | 4,223.99 mi (6,797.85 km) |
| McHenry to Onet Village | 4,313.80 mi (6,942.39 km) |
| McHenry to Onnaing | 4,130.48 mi (6,647.36 km) |
| McHenry to Orange | 4,413.41 mi (7,102.69 km) |
| McHenry to Orchies | 4,114.04 mi (6,620.91 km) |
| McHenry to Orleans | 4,154.73 mi (6,686.40 km) |
| McHenry to Orly | 4,143.36 mi (6,668.09 km) |
| McHenry to Ormesson-sur-Marne | 4,147.51 mi (6,674.76 km) |
| McHenry to Orsay | 4,137.01 mi (6,657.88 km) |
