| Boise to Kinston (North Carolina) | 2,119.58 mi (3,411.13 km) |
| Boise to Kirkland (Washington) | 403.99 mi (650.16 km) |
| Boise to Kirksville (Missouri) | 1,234.63 mi (1,986.94 km) |
| Boise to Kirkwood (Missouri) | 1,381.95 mi (2,224.04 km) |
| Boise to Kiryas Joel (New York) | 2,126.50 mi (3,422.26 km) |
| Boise to Kissimmee (Florida) | 2,192.96 mi (3,529.22 km) |
| Boise to Klamath Falls (Oregon) | 296.30 mi (476.84 km) |
| Boise to Knightdale (North Carolina) | 2,058.12 mi (3,312.22 km) |
| Boise to Knik-Fairview (Alaska) | 1,834.65 mi (2,952.58 km) |
| Boise to Knoxville (Tennessee) | 1,780.46 mi (2,865.37 km) |
| Boise to Kokomo (Indiana) | 1,551.37 mi (2,496.69 km) |
| Boise to Kuna (Idaho) | 11.25 mi (18.11 km) |
| Boise to Kyle (Texas) | 1,377.67 mi (2,217.15 km) |
| Boise to La Cañada Flintridge (California) | 657.37 mi (1,057.93 km) |
| Boise to La Crescenta-Montrose (California) | 656.14 mi (1,055.95 km) |
