| Duncan to Kinston (North Carolina) | 1,150.90 mi (1,852.19 km) |
| Duncan to Kirkland (Washington) | 1,546.12 mi (2,488.23 km) |
| Duncan to Kirksville (Missouri) | 488.65 mi (786.41 km) |
| Duncan to Kirkwood (Missouri) | 500.87 mi (806.07 km) |
| Duncan to Kiryas Joel (New York) | 1,371.69 mi (2,207.52 km) |
| Duncan to Kissimmee (Florida) | 1,062.49 mi (1,709.90 km) |
| Duncan to Klamath Falls (Oregon) | 1,390.73 mi (2,238.17 km) |
| Duncan to Knightdale (North Carolina) | 1,098.77 mi (1,768.29 km) |
| Duncan to Knik-Fairview (Alaska) | 2,909.63 mi (4,682.60 km) |
| Duncan to Knoxville (Tennessee) | 793.76 mi (1,277.44 km) |
| Duncan to Kokomo (Indiana) | 764.08 mi (1,229.67 km) |
| Duncan to Kuna (Idaho) | 1,164.56 mi (1,874.18 km) |
| Duncan to Kyle (Texas) | 314.22 mi (505.68 km) |
| Duncan to La Cañada Flintridge (California) | 1,154.71 mi (1,858.33 km) |
| Duncan to La Crescenta-Montrose (California) | 1,156.52 mi (1,861.23 km) |
