| Horb am Neckar to Novi di Modena | 266.81 mi (429.39 km) |
| Horb am Neckar to Novi Ligure | 254.72 mi (409.94 km) |
| Horb am Neckar to Nuoro | 562.52 mi (905.29 km) |
| Horb am Neckar to Occhiobello | 279.31 mi (449.50 km) |
| Horb am Neckar to Oderzo | 256.55 mi (412.87 km) |
| Horb am Neckar to Oggiono | 186.52 mi (300.17 km) |
| Horb am Neckar to Olbia | 521.68 mi (839.57 km) |
| Horb am Neckar to Oleggio | 196.61 mi (316.41 km) |
| Horb am Neckar to Olgiate Comasco | 184.38 mi (296.73 km) |
| Horb am Neckar to Olgiate Olona | 194.50 mi (313.02 km) |
| Horb am Neckar to Omegna | 177.88 mi (286.27 km) |
| Horb am Neckar to Opera | 213.01 mi (342.81 km) |
| Horb am Neckar to Oppeano | 247.12 mi (397.70 km) |
| Horb am Neckar to Orbassano | 243.74 mi (392.27 km) |
| Horb am Neckar to Orbetello | 432.53 mi (696.09 km) |
