| Upper Montclair to Olivares | 3,561.12 mi (5,731.07 km) |
| Upper Montclair to Olivenza | 3,476.45 mi (5,594.81 km) |
| Upper Montclair to Olot | 3,826.01 mi (6,157.37 km) |
| Upper Montclair to Onate | 3,575.25 mi (5,753.81 km) |
| Upper Montclair to Onda | 3,766.62 mi (6,061.80 km) |
| Upper Montclair to Onteniente | 3,786.15 mi (6,093.23 km) |
| Upper Montclair to Orihuela | 3,793.38 mi (6,104.86 km) |
| Upper Montclair to Osuna | 3,618.38 mi (5,823.22 km) |
| Upper Montclair to Ourense | 3,339.00 mi (5,373.61 km) |
| Upper Montclair to Oviedo | 3,407.39 mi (5,483.67 km) |
| Upper Montclair to Paiporta | 3,776.03 mi (6,076.93 km) |
| Upper Montclair to Pajara | 3,456.54 mi (5,562.77 km) |
| Upper Montclair to Palafolls | 3,853.97 mi (6,202.37 km) |
| Upper Montclair to Palafrugell | 3,865.13 mi (6,220.32 km) |
| Upper Montclair to Palamos | 3,865.81 mi (6,221.42 km) |
