| North Decatur to Orbetello | 4,942.79 mi (7,954.65 km) |
| North Decatur to Oria | 5,296.29 mi (8,523.55 km) |
| North Decatur to Oristano | 4,908.35 mi (7,899.23 km) |
| North Decatur to Orta Nova | 5,180.84 mi (8,337.75 km) |
| North Decatur to Orte | 4,994.08 mi (8,037.19 km) |
| North Decatur to Ortona | 5,086.44 mi (8,185.84 km) |
| North Decatur to Orvieto | 4,973.04 mi (8,003.33 km) |
| North Decatur to Orzinuovi | 4,789.25 mi (7,707.55 km) |
| North Decatur to Osimo | 5,006.58 mi (8,057.31 km) |
| North Decatur to Ospitaletto | 4,790.27 mi (7,709.20 km) |
| North Decatur to Ostuni | 5,285.25 mi (8,505.78 km) |
| North Decatur to Ottaviano | 5,143.74 mi (8,278.05 km) |
| North Decatur to Ovada | 4,757.65 mi (7,656.70 km) |
| North Decatur to Ozieri | 4,904.89 mi (7,893.67 km) |
| North Decatur to Paceco | 5,158.94 mi (8,302.50 km) |
