| Kastoria to Opwijk | 1,090.63 mi (1,755.20 km) |
| Kastoria to Ostend | 1,146.13 mi (1,844.51 km) |
| Kastoria to Oud-Heverlee | 1,068.10 mi (1,718.94 km) |
| Kastoria to Oud-Turnhout | 1,076.90 mi (1,733.10 km) |
| Kastoria to Oudenaarde | 1,107.17 mi (1,781.82 km) |
| Kastoria to Oudenburg | 1,141.60 mi (1,837.23 km) |
| Kastoria to Oupeye | 1,028.60 mi (1,655.37 km) |
| Kastoria to Overijse | 1,070.87 mi (1,723.39 km) |
| Kastoria to Overpelt | 1,057.86 mi (1,702.47 km) |
| Kastoria to Paal | 1,058.75 mi (1,703.89 km) |
| Kastoria to Peer | 1,053.03 mi (1,694.69 km) |
| Kastoria to Pepinster | 1,016.63 mi (1,636.11 km) |
| Kastoria to Peruwelz | 1,095.31 mi (1,762.73 km) |
| Kastoria to Perwez | 1,054.46 mi (1,696.99 km) |
| Kastoria to Philippeville | 1,047.64 mi (1,686.01 km) |
