| Castricum to Kinston (North Carolina) | 4,028.85 mi (6,483.81 km) |
| Castricum to Kirkland (Washington) | 4,838.38 mi (7,786.61 km) |
| Castricum to Kirksville (Missouri) | 4,353.48 mi (7,006.24 km) |
| Castricum to Kirkwood (Missouri) | 4,357.68 mi (7,013.01 km) |
| Castricum to Kiryas Joel (New York) | 3,607.18 mi (5,805.19 km) |
| Castricum to Kissimmee (Florida) | 4,533.03 mi (7,295.21 km) |
| Castricum to Klamath Falls (Oregon) | 5,152.65 mi (8,292.39 km) |
| Castricum to Knightdale (North Carolina) | 4,039.61 mi (6,501.13 km) |
| Castricum to Knik-Fairview (Alaska) | 4,430.75 mi (7,130.61 km) |
| Castricum to Knoxville (Tennessee) | 4,244.67 mi (6,831.14 km) |
| Castricum to Kokomo (Indiana) | 4,105.28 mi (6,606.82 km) |
| Castricum to Kuna (Idaho) | 4,934.18 mi (7,940.79 km) |
| Castricum to Kyle (Texas) | 5,084.99 mi (8,183.50 km) |
| Castricum to La Cañada Flintridge (California) | 5,528.30 mi (8,896.93 km) |
| Castricum to La Crescenta-Montrose (California) | 5,528.01 mi (8,896.47 km) |
