| Karlovo to Novi di Modena | 710.09 mi (1,142.78 km) |
| Karlovo to Novi Ligure | 812.14 mi (1,307.01 km) |
| Karlovo to Nuoro | 815.73 mi (1,312.79 km) |
| Karlovo to Occhiobello | 677.43 mi (1,090.22 km) |
| Karlovo to Oderzo | 646.41 mi (1,040.30 km) |
| Karlovo to Oggiono | 794.18 mi (1,278.11 km) |
| Karlovo to Olbia | 796.52 mi (1,281.87 km) |
| Karlovo to Oleggio | 826.23 mi (1,329.69 km) |
| Karlovo to Olgiate Comasco | 812.36 mi (1,307.37 km) |
| Karlovo to Olgiate Olona | 814.64 mi (1,311.03 km) |
| Karlovo to Omegna | 840.03 mi (1,351.90 km) |
| Karlovo to Opera | 796.09 mi (1,281.18 km) |
| Karlovo to Oppeano | 700.91 mi (1,128.00 km) |
| Karlovo to Orbassano | 874.47 mi (1,407.32 km) |
| Karlovo to Orbetello | 691.47 mi (1,112.81 km) |
