| South Portland to Kennewick (Washington) | 2,360.38 mi (3,798.66 km) |
| South Portland to Kenosha (Wisconsin) | 888.42 mi (1,429.78 km) |
| South Portland to Kent (Ohio) | 589.91 mi (949.36 km) |
| South Portland to Kent (Washington) | 2,480.52 mi (3,992.02 km) |
| South Portland to Kentwood (Michigan) | 770.66 mi (1,240.26 km) |
| South Portland to Kerman (California) | 2,630.30 mi (4,233.07 km) |
| South Portland to Kernersville (North Carolina) | 733.90 mi (1,181.10 km) |
| South Portland to Kerrville (Texas) | 1,836.86 mi (2,956.14 km) |
| South Portland to Kettering (Maryland) | 470.15 mi (756.64 km) |
| South Portland to Kettering (Ohio) | 764.17 mi (1,229.82 km) |
| South Portland to Kewanee (Illinois) | 1,012.42 mi (1,629.34 km) |
| South Portland to Key Biscayne (Florida) | 1,358.28 mi (2,185.95 km) |
| South Portland to Key Largo (Florida) | 1,400.47 mi (2,253.83 km) |
| South Portland to Key West (Florida) | 1,468.86 mi (2,363.90 km) |
| South Portland to Keystone (Florida) | 1,270.33 mi (2,044.39 km) |
