| Karlovo to Nottingham | 1,388.14 mi (2,234.00 km) |
| Karlovo to Nuneaton | 1,390.68 mi (2,238.09 km) |
| Karlovo to Oadby | 1,376.87 mi (2,215.86 km) |
| Karlovo to Oakengates | 1,433.57 mi (2,307.11 km) |
| Karlovo to Oakham | 1,365.04 mi (2,196.82 km) |
| Karlovo to Oldbury | 1,412.14 mi (2,272.62 km) |
| Karlovo to Oldham | 1,439.88 mi (2,317.27 km) |
| Karlovo to Ollerton | 1,389.15 mi (2,235.63 km) |
| Karlovo to Olton | 1,402.29 mi (2,256.77 km) |
| Karlovo to Omagh | 1,661.66 mi (2,674.18 km) |
| Karlovo to Ormesby | 1,431.32 mi (2,303.49 km) |
| Karlovo to Ormskirk | 1,470.09 mi (2,365.88 km) |
| Karlovo to Orpington | 1,302.33 mi (2,095.90 km) |
| Karlovo to Ossett | 1,422.72 mi (2,289.65 km) |
| Karlovo to Oswaldtwistle | 1,455.30 mi (2,342.08 km) |
