| Langen to Oestrich-Winkel | 29.64 mi (47.70 km) |
| Langen to Offenburg | 109.89 mi (176.85 km) |
| Langen to Oftersheim | 42.49 mi (68.38 km) |
| Langen to Ohrdruf | 108.09 mi (173.96 km) |
| Langen to Ohringen | 65.74 mi (105.80 km) |
| Langen to Olbernhau | 211.16 mi (339.82 km) |
| Langen to Olching | 171.90 mi (276.65 km) |
| Langen to Oldenburg | 219.24 mi (352.83 km) |
| Langen to Oldenburg in Holstein | 312.67 mi (503.20 km) |
| Langen to Olfen | 132.20 mi (212.76 km) |
| Langen to Olpe | 80.25 mi (129.14 km) |
| Langen to Olsberg | 94.77 mi (152.52 km) |
| Langen to Oranienburg | 274.71 mi (442.10 km) |
| Langen to Ortenberg | 30.95 mi (49.82 km) |
| Langen to Oschatz | 214.75 mi (345.60 km) |
