| Ariano Irpino to Oerlinghausen | 806.29 mi (1,297.59 km) |
| Ariano Irpino to Oestrich-Winkel | 700.12 mi (1,126.73 km) |
| Ariano Irpino to Offenburg | 614.54 mi (989.00 km) |
| Ariano Irpino to Oftersheim | 649.38 mi (1,045.08 km) |
| Ariano Irpino to Ohrdruf | 700.12 mi (1,126.73 km) |
| Ariano Irpino to Ohringen | 618.64 mi (995.61 km) |
| Ariano Irpino to Olbernhau | 662.69 mi (1,066.50 km) |
| Ariano Irpino to Olching | 520.82 mi (838.19 km) |
| Ariano Irpino to Oldenburg | 888.26 mi (1,429.52 km) |
| Ariano Irpino to Oldenburg in Holstein | 928.75 mi (1,494.68 km) |
| Ariano Irpino to Olfen | 815.86 mi (1,313.00 km) |
| Ariano Irpino to Olpe | 764.22 mi (1,229.89 km) |
| Ariano Irpino to Olsberg | 771.25 mi (1,241.20 km) |
| Ariano Irpino to Oranienburg | 806.27 mi (1,297.56 km) |
| Ariano Irpino to Ortenberg | 698.67 mi (1,124.39 km) |
