| Prospect Heights to Kennewick (Washington) | 1,564.13 mi (2,517.22 km) |
| Prospect Heights to Kenosha (Wisconsin) | 33.44 mi (53.82 km) |
| Prospect Heights to Kent (Ohio) | 345.36 mi (555.81 km) |
| Prospect Heights to Kent (Washington) | 1,707.00 mi (2,747.15 km) |
| Prospect Heights to Kentwood (Michigan) | 130.58 mi (210.16 km) |
| Prospect Heights to Kerman (California) | 1,744.31 mi (2,807.20 km) |
| Prospect Heights to Kernersville (North Carolina) | 589.85 mi (949.27 km) |
| Prospect Heights to Kerrville (Texas) | 1,040.29 mi (1,674.19 km) |
| Prospect Heights to Kettering (Maryland) | 625.35 mi (1,006.41 km) |
| Prospect Heights to Kettering (Ohio) | 258.03 mi (415.25 km) |
| Prospect Heights to Kewanee (Illinois) | 119.22 mi (191.87 km) |
| Prospect Heights to Key Biscayne (Florida) | 1,216.91 mi (1,958.42 km) |
| Prospect Heights to Key Largo (Florida) | 1,249.14 mi (2,010.29 km) |
| Prospect Heights to Key West (Florida) | 1,261.88 mi (2,030.80 km) |
| Prospect Heights to Keystone (Florida) | 1,010.71 mi (1,626.57 km) |
