| South Portland to Kidricevo | 3,989.32 mi (6,420.20 km) |
| South Portland to Kobarid | 3,904.03 mi (6,282.93 km) |
| South Portland to Kobilje | 4,003.53 mi (6,443.05 km) |
| South Portland to Kocevje | 3,978.26 mi (6,402.39 km) |
| South Portland to Komen | 3,926.27 mi (6,318.72 km) |
| South Portland to Komenda | 3,944.95 mi (6,348.78 km) |
| South Portland to Koper | 3,934.94 mi (6,332.68 km) |
| South Portland to Kostanjevica na Krki | 3,994.22 mi (6,428.08 km) |
| South Portland to Kostel | 3,985.18 mi (6,413.52 km) |
| South Portland to Kozje | 3,991.51 mi (6,423.71 km) |
| South Portland to Kranj | 3,936.95 mi (6,335.91 km) |
| South Portland to Kranjska Gora | 3,904.30 mi (6,283.36 km) |
| South Portland to Krizevci | 3,997.54 mi (6,433.42 km) |
| South Portland to Krsko | 3,992.88 mi (6,425.92 km) |
| South Portland to Kuzma | 3,985.54 mi (6,414.10 km) |
