| Horn-Bad Meinberg to Oestrich-Winkel | 136.76 mi (220.09 km) |
| Horn-Bad Meinberg to Offenburg | 240.45 mi (386.96 km) |
| Horn-Bad Meinberg to Oftersheim | 174.42 mi (280.69 km) |
| Horn-Bad Meinberg to Ohrdruf | 105.46 mi (169.72 km) |
| Horn-Bad Meinberg to Ohringen | 186.87 mi (300.74 km) |
| Horn-Bad Meinberg to Olbernhau | 206.57 mi (332.44 km) |
| Horn-Bad Meinberg to Olching | 274.99 mi (442.55 km) |
| Horn-Bad Meinberg to Oldenburg | 92.67 mi (149.14 km) |
| Horn-Bad Meinberg to Oldenburg in Holstein | 184.93 mi (297.62 km) |
| Horn-Bad Meinberg to Olfen | 68.63 mi (110.44 km) |
| Horn-Bad Meinberg to Olpe | 77.24 mi (124.31 km) |
| Horn-Bad Meinberg to Olsberg | 42.28 mi (68.05 km) |
| Horn-Bad Meinberg to Oranienburg | 190.09 mi (305.92 km) |
| Horn-Bad Meinberg to Ortenberg | 105.61 mi (169.96 km) |
| Horn-Bad Meinberg to Oschatz | 182.21 mi (293.24 km) |
