| Horn Lake to Oerlinghausen | 4,697.96 mi (7,560.63 km) |
| Horn Lake to Oestrich-Winkel | 4,738.98 mi (7,626.65 km) |
| Horn Lake to Offenburg | 4,788.65 mi (7,706.59 km) |
| Horn Lake to Oftersheim | 4,783.20 mi (7,697.81 km) |
| Horn Lake to Ohrdruf | 4,814.41 mi (7,748.04 km) |
| Horn Lake to Ohringen | 4,824.77 mi (7,764.72 km) |
| Horn Lake to Olbernhau | 4,916.97 mi (7,913.11 km) |
| Horn Lake to Olching | 4,931.45 mi (7,936.40 km) |
| Horn Lake to Oldenburg | 4,642.18 mi (7,470.87 km) |
| Horn Lake to Oldenburg in Holstein | 4,698.76 mi (7,561.93 km) |
| Horn Lake to Olfen | 4,658.21 mi (7,496.66 km) |
| Horn Lake to Olpe | 4,698.40 mi (7,561.35 km) |
| Horn Lake to Olsberg | 4,711.84 mi (7,582.98 km) |
| Horn Lake to Oranienburg | 4,836.50 mi (7,783.60 km) |
| Horn Lake to Ortenberg | 4,767.42 mi (7,672.42 km) |
