| Colonia to Orbetello | 4,223.85 mi (6,797.63 km) |
| Colonia to Oria | 4,576.55 mi (7,365.24 km) |
| Colonia to Oristano | 4,194.07 mi (6,749.70 km) |
| Colonia to Orta Nova | 4,461.17 mi (7,179.57 km) |
| Colonia to Orte | 4,274.70 mi (6,879.46 km) |
| Colonia to Ortona | 4,366.51 mi (7,027.22 km) |
| Colonia to Orvieto | 4,253.55 mi (6,845.42 km) |
| Colonia to Orzinuovi | 4,068.66 mi (6,547.88 km) |
| Colonia to Osimo | 4,286.23 mi (6,898.01 km) |
| Colonia to Ospitaletto | 4,069.60 mi (6,549.40 km) |
| Colonia to Ostuni | 4,565.37 mi (7,347.26 km) |
| Colonia to Ottaviano | 4,424.92 mi (7,121.22 km) |
| Colonia to Ovada | 4,037.76 mi (6,498.15 km) |
| Colonia to Ozieri | 4,189.28 mi (6,741.99 km) |
| Colonia to Paceco | 4,444.80 mi (7,153.21 km) |
