| Neckargemund to Oestrich-Winkel | 54.99 mi (88.50 km) |
| Neckargemund to Offenburg | 75.12 mi (120.89 km) |
| Neckargemund to Oftersheim | 9.71 mi (15.62 km) |
| Neckargemund to Ohrdruf | 131.04 mi (210.88 km) |
| Neckargemund to Ohringen | 34.37 mi (55.32 km) |
| Neckargemund to Olbernhau | 219.64 mi (353.48 km) |
| Neckargemund to Olching | 141.24 mi (227.30 km) |
| Neckargemund to Oldenburg | 260.32 mi (418.95 km) |
| Neckargemund to Oldenburg in Holstein | 350.43 mi (563.97 km) |
| Neckargemund to Olfen | 172.07 mi (276.92 km) |
| Neckargemund to Olpe | 119.96 mi (193.05 km) |
| Neckargemund to Olsberg | 135.86 mi (218.65 km) |
| Neckargemund to Oranienburg | 301.63 mi (485.43 km) |
| Neckargemund to Ortenberg | 67.44 mi (108.54 km) |
| Neckargemund to Oschatz | 231.15 mi (372.00 km) |
