| South Portland to Krosno Odrzanskie | 3,770.09 mi (6,067.38 km) |
| South Portland to Krotoszyn | 3,869.14 mi (6,226.78 km) |
| South Portland to Kruszwica | 3,868.72 mi (6,226.11 km) |
| South Portland to Krynica | 4,082.36 mi (6,569.92 km) |
| South Portland to Krzeszowice | 4,005.94 mi (6,446.93 km) |
| South Portland to Kudowa-Zdroj | 3,866.00 mi (6,221.73 km) |
| South Portland to Kutno | 3,921.86 mi (6,311.62 km) |
| South Portland to Kwidzyn | 3,854.94 mi (6,203.93 km) |
| South Portland to Lancut | 4,105.97 mi (6,607.91 km) |
| South Portland to Lapy | 4,021.82 mi (6,472.50 km) |
| South Portland to Lask | 3,935.60 mi (6,333.74 km) |
| South Portland to Laziska Gorne | 3,975.66 mi (6,398.21 km) |
| South Portland to Lebork | 3,786.18 mi (6,093.27 km) |
| South Portland to Leczna | 4,083.80 mi (6,572.24 km) |
| South Portland to Leczyca | 3,922.09 mi (6,311.99 km) |
