| Prospect Heights to Keene (New Hampshire) | 796.70 mi (1,282.16 km) |
| Prospect Heights to Keizer (Oregon) | 1,754.98 mi (2,824.36 km) |
| Prospect Heights to Keller (Texas) | 812.04 mi (1,306.85 km) |
| Prospect Heights to Kelso (Washington) | 1,742.09 mi (2,803.63 km) |
| Prospect Heights to Kemp Mill (Maryland) | 609.65 mi (981.13 km) |
| Prospect Heights to Ken Caryl (Colorado) | 913.58 mi (1,470.26 km) |
| Prospect Heights to Kendale Lakes (Florida) | 1,210.84 mi (1,948.67 km) |
| Prospect Heights to Kendall (Florida) | 1,214.41 mi (1,954.40 km) |
| Prospect Heights to Kendall Park (New Jersey) | 703.11 mi (1,131.54 km) |
| Prospect Heights to Kendall West (Florida) | 1,210.33 mi (1,947.84 km) |
| Prospect Heights to Kenmore (New York) | 464.62 mi (747.74 km) |
| Prospect Heights to Kenmore (Washington) | 1,708.68 mi (2,749.86 km) |
| Prospect Heights to Kenner (Louisiana) | 845.51 mi (1,360.71 km) |
| Prospect Heights to Kennesaw (Georgia) | 586.30 mi (943.57 km) |
| Prospect Heights to Kennett (Missouri) | 420.73 mi (677.10 km) |
