| South Portland to Keene (New Hampshire) | 111.53 mi (179.49 km) |
| South Portland to Keizer (Oregon) | 2,561.81 mi (4,122.84 km) |
| South Portland to Keller (Texas) | 1,627.10 mi (2,618.57 km) |
| South Portland to Kelso (Washington) | 2,533.73 mi (4,077.64 km) |
| South Portland to Kemp Mill (Maryland) | 471.45 mi (758.72 km) |
| South Portland to Ken Caryl (Colorado) | 1,807.34 mi (2,908.64 km) |
| South Portland to Kendale Lakes (Florida) | 1,362.80 mi (2,193.22 km) |
| South Portland to Kendall (Florida) | 1,364.04 mi (2,195.21 km) |
| South Portland to Kendall Park (New Jersey) | 312.23 mi (502.48 km) |
| South Portland to Kendall West (Florida) | 1,363.63 mi (2,194.56 km) |
| South Portland to Kenmore (New York) | 433.80 mi (698.13 km) |
| South Portland to Kenmore (Washington) | 2,476.33 mi (3,985.27 km) |
| South Portland to Kenner (Louisiana) | 1,443.99 mi (2,323.88 km) |
| South Portland to Kennesaw (Georgia) | 1,014.83 mi (1,633.21 km) |
| South Portland to Kennett (Missouri) | 1,160.73 mi (1,868.01 km) |
