| Middelburg to Orbetello | 720.33 mi (1,159.26 km) |
| Middelburg to Oria | 1,011.52 mi (1,627.89 km) |
| Middelburg to Oristano | 835.78 mi (1,345.05 km) |
| Middelburg to Orta Nova | 906.20 mi (1,458.38 km) |
| Middelburg to Orte | 747.82 mi (1,203.50 km) |
| Middelburg to Ortona | 809.78 mi (1,303.22 km) |
| Middelburg to Orvieto | 725.35 mi (1,167.33 km) |
| Middelburg to Orzinuovi | 510.88 mi (822.19 km) |
| Middelburg to Osimo | 719.11 mi (1,157.30 km) |
| Middelburg to Ospitaletto | 505.53 mi (813.57 km) |
| Middelburg to Ostuni | 997.05 mi (1,604.60 km) |
| Middelburg to Ottaviano | 898.74 mi (1,446.39 km) |
| Middelburg to Ovada | 527.55 mi (849.02 km) |
| Middelburg to Ozieri | 796.63 mi (1,282.05 km) |
| Middelburg to Paceco | 1,029.89 mi (1,657.45 km) |
