| Mengen to Oestrich-Winkel | 147.61 mi (237.55 km) |
| Mengen to Offenburg | 70.41 mi (113.32 km) |
| Mengen to Oftersheim | 97.38 mi (156.73 km) |
| Mengen to Ohrdruf | 202.04 mi (325.15 km) |
| Mengen to Ohringen | 79.86 mi (128.52 km) |
| Mengen to Olbernhau | 255.18 mi (410.67 km) |
| Mengen to Olching | 92.21 mi (148.40 km) |
| Mengen to Oldenburg | 355.35 mi (571.88 km) |
| Mengen to Oldenburg in Holstein | 437.04 mi (703.34 km) |
| Mengen to Olfen | 267.75 mi (430.91 km) |
| Mengen to Olpe | 215.69 mi (347.13 km) |
| Mengen to Olsberg | 231.14 mi (371.99 km) |
| Mengen to Oranienburg | 367.66 mi (591.69 km) |
| Mengen to Ortenberg | 159.82 mi (257.20 km) |
| Mengen to Oschatz | 280.93 mi (452.11 km) |
