| Castlebar to Juprelle | 661.94 mi (1,065.29 km) |
| Castlebar to Jurbise | 604.56 mi (972.94 km) |
| Castlebar to Kalmthout | 601.12 mi (967.41 km) |
| Castlebar to Kampenhout | 616.45 mi (992.09 km) |
| Castlebar to Kapelle-op-den-Bos | 607.06 mi (976.96 km) |
| Castlebar to Kapellen | 601.52 mi (968.05 km) |
| Castlebar to Kasterlee | 623.92 mi (1,004.11 km) |
| Castlebar to Keerbergen | 617.93 mi (994.47 km) |
| Castlebar to Kinrooi | 658.33 mi (1,059.47 km) |
| Castlebar to Knokke-Heist | 555.22 mi (893.53 km) |
| Castlebar to Koekelare | 550.20 mi (885.46 km) |
| Castlebar to Koekelberg | 610.06 mi (981.79 km) |
| Castlebar to Koksijde | 536.96 mi (864.15 km) |
| Castlebar to Kontich | 607.11 mi (977.05 km) |
| Castlebar to Kortemark | 554.54 mi (892.45 km) |
