| Siverek to Oerlinghausen | 1,773.51 mi (2,854.19 km) |
| Siverek to Oestrich-Winkel | 1,756.37 mi (2,826.61 km) |
| Siverek to Offenburg | 1,731.53 mi (2,786.64 km) |
| Siverek to Oftersheim | 1,718.97 mi (2,766.42 km) |
| Siverek to Ohrdruf | 1,661.70 mi (2,674.25 km) |
| Siverek to Ohringen | 1,676.07 mi (2,697.38 km) |
| Siverek to Olbernhau | 1,552.95 mi (2,499.23 km) |
| Siverek to Olching | 1,576.74 mi (2,537.52 km) |
| Siverek to Oldenburg | 1,821.99 mi (2,932.21 km) |
| Siverek to Oldenburg in Holstein | 1,758.86 mi (2,830.61 km) |
| Siverek to Olfen | 1,818.81 mi (2,927.10 km) |
| Siverek to Olpe | 1,784.70 mi (2,872.20 km) |
| Siverek to Olsberg | 1,765.76 mi (2,841.71 km) |
| Siverek to Oranienburg | 1,622.49 mi (2,611.15 km) |
| Siverek to Ortenberg | 1,719.40 mi (2,767.11 km) |
