| Horb am Neckar to Oestrich-Winkel | 111.85 mi (180.01 km) |
| Horb am Neckar to Offenburg | 34.76 mi (55.93 km) |
| Horb am Neckar to Oftersheim | 64.11 mi (103.18 km) |
| Horb am Neckar to Ohrdruf | 188.27 mi (302.99 km) |
| Horb am Neckar to Ohringen | 63.82 mi (102.71 km) |
| Horb am Neckar to Olbernhau | 258.47 mi (415.97 km) |
| Horb am Neckar to Olching | 121.81 mi (196.03 km) |
| Horb am Neckar to Oldenburg | 325.31 mi (523.53 km) |
| Horb am Neckar to Oldenburg in Holstein | 415.37 mi (668.47 km) |
| Horb am Neckar to Olfen | 233.34 mi (375.52 km) |
| Horb am Neckar to Olpe | 181.75 mi (292.49 km) |
| Horb am Neckar to Olsberg | 200.91 mi (323.33 km) |
| Horb am Neckar to Oranienburg | 358.15 mi (576.39 km) |
| Horb am Neckar to Ortenberg | 133.01 mi (214.07 km) |
| Horb am Neckar to Oschatz | 278.44 mi (448.11 km) |
