| Covasna to Oberkirch | 867.73 mi (1,396.47 km) |
| Covasna to Obernburg am Main | 834.85 mi (1,343.56 km) |
| Covasna to Obernkirchen | 887.76 mi (1,428.71 km) |
| Covasna to Oberschleissheim | 706.73 mi (1,137.37 km) |
| Covasna to Oberstdorf | 760.99 mi (1,224.70 km) |
| Covasna to Obertraubling | 688.78 mi (1,108.49 km) |
| Covasna to Obertshausen | 851.73 mi (1,370.72 km) |
| Covasna to Oberursel | 864.97 mi (1,392.03 km) |
| Covasna to Ochsenfurt | 791.64 mi (1,274.03 km) |
| Covasna to Ochsenhausen | 779.38 mi (1,254.29 km) |
| Covasna to Ochtrup | 962.18 mi (1,548.48 km) |
| Covasna to Odenthal | 941.14 mi (1,514.62 km) |
| Covasna to Oelde | 915.09 mi (1,472.70 km) |
| Covasna to Oelsnitz | 717.83 mi (1,155.23 km) |
| Covasna to Oer-Erkenschwick | 947.34 mi (1,524.59 km) |
