| Van Buren to Orbetello | 5,299.47 mi (8,528.68 km) |
| Van Buren to Oria | 5,643.36 mi (9,082.12 km) |
| Van Buren to Oristano | 5,291.19 mi (8,515.34 km) |
| Van Buren to Orta Nova | 5,529.47 mi (8,898.82 km) |
| Van Buren to Orte | 5,346.65 mi (8,604.61 km) |
| Van Buren to Ortona | 5,432.79 mi (8,743.23 km) |
| Van Buren to Orvieto | 5,324.74 mi (8,569.34 km) |
| Van Buren to Orzinuovi | 5,128.69 mi (8,253.82 km) |
| Van Buren to Osimo | 5,348.18 mi (8,607.06 km) |
| Van Buren to Ospitaletto | 5,128.11 mi (8,252.89 km) |
| Van Buren to Ostuni | 5,630.96 mi (9,062.15 km) |
| Van Buren to Ottaviano | 5,500.09 mi (8,851.54 km) |
| Van Buren to Ovada | 5,106.78 mi (8,218.57 km) |
| Van Buren to Ozieri | 5,281.76 mi (8,500.17 km) |
| Van Buren to Paceco | 5,541.15 mi (8,917.61 km) |
