| Halstead to Oerlinghausen | 341.56 mi (549.69 km) |
| Halstead to Oestrich-Winkel | 347.03 mi (558.49 km) |
| Halstead to Offenburg | 401.87 mi (646.74 km) |
| Halstead to Oftersheim | 390.49 mi (628.43 km) |
| Halstead to Ohrdruf | 441.55 mi (710.61 km) |
| Halstead to Ohringen | 432.15 mi (695.48 km) |
| Halstead to Olbernhau | 554.56 mi (892.49 km) |
| Halstead to Olching | 538.77 mi (867.07 km) |
| Halstead to Oldenburg | 328.63 mi (528.88 km) |
| Halstead to Oldenburg in Holstein | 454.26 mi (731.07 km) |
| Halstead to Olfen | 288.21 mi (463.83 km) |
| Halstead to Olpe | 315.91 mi (508.42 km) |
| Halstead to Olsberg | 338.55 mi (544.84 km) |
| Halstead to Oranienburg | 533.84 mi (859.14 km) |
| Halstead to Ortenberg | 380.60 mi (612.51 km) |
