| Cloppenburg to Oria | 964.77 mi (1,552.64 km) |
| Cloppenburg to Oristano | 894.72 mi (1,439.92 km) |
| Cloppenburg to Orta Nova | 872.52 mi (1,404.18 km) |
| Cloppenburg to Orte | 745.33 mi (1,199.50 km) |
| Cloppenburg to Ortona | 782.73 mi (1,259.68 km) |
| Cloppenburg to Orvieto | 724.67 mi (1,166.24 km) |
| Cloppenburg to Orzinuovi | 521.69 mi (839.58 km) |
| Cloppenburg to Osimo | 693.43 mi (1,115.96 km) |
| Cloppenburg to Ospitaletto | 512.17 mi (824.26 km) |
| Cloppenburg to Ostuni | 949.03 mi (1,527.32 km) |
| Cloppenburg to Ottaviano | 882.12 mi (1,419.64 km) |
| Cloppenburg to Ovada | 567.96 mi (914.04 km) |
| Cloppenburg to Ozieri | 848.62 mi (1,365.72 km) |
| Cloppenburg to Paceco | 1,049.59 mi (1,689.15 km) |
| Cloppenburg to Pachino | 1,165.71 mi (1,876.03 km) |
