| Lake Monticello to Octeville | 3,740.35 mi (6,019.51 km) |
| Lake Monticello to Oignies | 3,914.10 mi (6,299.14 km) |
| Lake Monticello to Oissel | 3,862.57 mi (6,216.21 km) |
| Lake Monticello to Olivet | 3,934.03 mi (6,331.21 km) |
| Lake Monticello to Ollioules | 4,242.57 mi (6,827.76 km) |
| Lake Monticello to Olonne-sur-Mer | 3,806.68 mi (6,126.26 km) |
| Lake Monticello to Oloron-Sainte-Marie | 3,946.28 mi (6,350.92 km) |
| Lake Monticello to Onet Village | 4,059.57 mi (6,533.25 km) |
| Lake Monticello to Onnaing | 3,940.94 mi (6,342.33 km) |
| Lake Monticello to Orange | 4,165.62 mi (6,703.91 km) |
| Lake Monticello to Orchies | 3,924.25 mi (6,315.47 km) |
| Lake Monticello to Orleans | 3,933.39 mi (6,330.19 km) |
| Lake Monticello to Orly | 3,932.44 mi (6,328.65 km) |
| Lake Monticello to Ormesson-sur-Marne | 3,937.52 mi (6,336.83 km) |
| Lake Monticello to Orsay | 3,924.91 mi (6,316.53 km) |
