| South Portland to Kingsville (Texas) | 1,893.55 mi (3,047.38 km) |
| South Portland to Kinston (North Carolina) | 695.92 mi (1,119.98 km) |
| South Portland to Kirkland (Washington) | 2,475.24 mi (3,983.52 km) |
| South Portland to Kirksville (Missouri) | 1,166.35 mi (1,877.06 km) |
| South Portland to Kirkwood (Missouri) | 1,101.37 mi (1,772.49 km) |
| South Portland to Kiryas Joel (New York) | 253.05 mi (407.24 km) |
| South Portland to Kissimmee (Florida) | 1,225.66 mi (1,972.51 km) |
| South Portland to Klamath Falls (Oregon) | 2,564.19 mi (4,126.67 km) |
| South Portland to Knightdale (North Carolina) | 694.74 mi (1,118.08 km) |
| South Portland to Knik-Fairview (Alaska) | 3,310.05 mi (5,327.02 km) |
| South Portland to Knoxville (Tennessee) | 895.88 mi (1,441.78 km) |
| South Portland to Kokomo (Indiana) | 840.10 mi (1,352.01 km) |
| South Portland to Kuna (Idaho) | 2,277.92 mi (3,665.95 km) |
| South Portland to Kyle (Texas) | 1,781.03 mi (2,866.30 km) |
| South Portland to La Cañada Flintridge (California) | 2,618.18 mi (4,213.55 km) |
