| Halstead to Oberkirch | 404.31 mi (650.68 km) |
| Halstead to Obernburg am Main | 397.70 mi (640.03 km) |
| Halstead to Obernkirchen | 360.21 mi (579.70 km) |
| Halstead to Oberschleissheim | 546.65 mi (879.75 km) |
| Halstead to Oberstdorf | 532.10 mi (856.33 km) |
| Halstead to Obertraubling | 546.46 mi (879.44 km) |
| Halstead to Obertshausen | 378.82 mi (609.65 km) |
| Halstead to Oberursel | 364.70 mi (586.93 km) |
| Halstead to Ochsenfurt | 440.71 mi (709.26 km) |
| Halstead to Ochsenhausen | 491.77 mi (791.42 km) |
| Halstead to Ochtrup | 278.61 mi (448.38 km) |
| Halstead to Odenthal | 285.52 mi (459.50 km) |
| Halstead to Oelde | 320.16 mi (515.24 km) |
| Halstead to Oelsnitz | 509.66 mi (820.22 km) |
| Halstead to Oer-Erkenschwick | 283.13 mi (455.66 km) |
