| Upper Montclair to Octeville | 3,442.57 mi (5,540.27 km) |
| Upper Montclair to Oignies | 3,615.53 mi (5,818.63 km) |
| Upper Montclair to Oissel | 3,564.61 mi (5,736.68 km) |
| Upper Montclair to Olivet | 3,636.76 mi (5,852.80 km) |
| Upper Montclair to Ollioules | 3,947.98 mi (6,353.67 km) |
| Upper Montclair to Olonne-sur-Mer | 3,511.19 mi (5,650.72 km) |
| Upper Montclair to Oloron-Sainte-Marie | 3,654.02 mi (5,880.57 km) |
| Upper Montclair to Onet Village | 3,764.90 mi (6,059.03 km) |
| Upper Montclair to Onnaing | 3,642.35 mi (5,861.79 km) |
| Upper Montclair to Orange | 3,870.47 mi (6,228.92 km) |
| Upper Montclair to Orchies | 3,625.65 mi (5,834.93 km) |
| Upper Montclair to Orleans | 3,636.10 mi (5,851.74 km) |
| Upper Montclair to Orly | 3,634.60 mi (5,849.33 km) |
| Upper Montclair to Ormesson-sur-Marne | 3,639.65 mi (5,857.45 km) |
| Upper Montclair to Orsay | 3,627.12 mi (5,837.29 km) |
