| Kastamonu to Nasaud | 616.49 mi (992.14 km) |
| Kastamonu to Navodari | 331.25 mi (533.09 km) |
| Kastamonu to Negresti-Oas | 677.49 mi (1,090.32 km) |
| Kastamonu to Nehoiu | 464.80 mi (748.02 km) |
| Kastamonu to Ocna Mures | 602.48 mi (969.60 km) |
| Kastamonu to Odobesti | 452.29 mi (727.89 km) |
| Kastamonu to Odorheiu Secuiesc | 542.36 mi (872.84 km) |
| Kastamonu to Oltenita | 407.68 mi (656.10 km) |
| Kastamonu to Onesti | 485.26 mi (780.95 km) |
| Kastamonu to Oradea | 705.51 mi (1,135.41 km) |
| Kastamonu to Orastie | 612.01 mi (984.93 km) |
| Kastamonu to Oravita | 658.59 mi (1,059.91 km) |
| Kastamonu to Orsova | 618.75 mi (995.77 km) |
| Kastamonu to Otelu Rosu | 639.71 mi (1,029.52 km) |
| Kastamonu to Otopeni | 446.84 mi (719.11 km) |
