| Simmerath to Oerlinghausen | 139.20 mi (224.02 km) |
| Simmerath to Oestrich-Winkel | 85.73 mi (137.97 km) |
| Simmerath to Offenburg | 164.59 mi (264.88 km) |
| Simmerath to Oftersheim | 132.35 mi (213.00 km) |
| Simmerath to Ohrdruf | 194.55 mi (313.11 km) |
| Simmerath to Ohringen | 172.15 mi (277.04 km) |
| Simmerath to Olbernhau | 308.16 mi (495.94 km) |
| Simmerath to Olching | 279.87 mi (450.41 km) |
| Simmerath to Oldenburg | 193.79 mi (311.88 km) |
| Simmerath to Oldenburg in Holstein | 320.18 mi (515.28 km) |
| Simmerath to Olfen | 90.32 mi (145.35 km) |
| Simmerath to Olpe | 72.88 mi (117.30 km) |
| Simmerath to Olsberg | 108.21 mi (174.14 km) |
| Simmerath to Oranienburg | 332.22 mi (534.66 km) |
| Simmerath to Ortenberg | 122.32 mi (196.86 km) |
