| Neckargemund to Oria | 750.09 mi (1,207.15 km) |
| Neckargemund to Oristano | 655.64 mi (1,055.15 km) |
| Neckargemund to Orta Nova | 649.77 mi (1,045.70 km) |
| Neckargemund to Orte | 509.01 mi (819.17 km) |
| Neckargemund to Ortona | 555.96 mi (894.73 km) |
| Neckargemund to Orvieto | 487.70 mi (784.87 km) |
| Neckargemund to Orzinuovi | 281.01 mi (452.24 km) |
| Neckargemund to Osimo | 465.13 mi (748.56 km) |
| Neckargemund to Ospitaletto | 271.82 mi (437.45 km) |
| Neckargemund to Ostuni | 735.07 mi (1,182.97 km) |
| Neckargemund to Ottaviano | 651.58 mi (1,048.62 km) |
| Neckargemund to Ovada | 328.59 mi (528.82 km) |
| Neckargemund to Ozieri | 608.73 mi (979.65 km) |
| Neckargemund to Paceco | 810.11 mi (1,303.74 km) |
| Neckargemund to Pachino | 931.08 mi (1,498.43 km) |
