| Prospect Heights to Cadillac (Michigan) | 194.84 mi (313.57 km) |
| Prospect Heights to Caguas (Puerto Rico) | 2,091.49 mi (3,365.93 km) |
| Prospect Heights to Cahokia (Illinois) | 271.75 mi (437.34 km) |
| Prospect Heights to Calabasas (California) | 1,748.32 mi (2,813.64 km) |
| Prospect Heights to Caldwell (Idaho) | 1,451.48 mi (2,335.93 km) |
| Prospect Heights to Caledonia (Wisconsin) | 48.07 mi (77.36 km) |
| Prospect Heights to Calera (Alabama) | 623.70 mi (1,003.74 km) |
| Prospect Heights to Calexico (California) | 1,637.92 mi (2,635.98 km) |
| Prospect Heights to Calhoun (Georgia) | 550.29 mi (885.60 km) |
| Prospect Heights to California (Maryland) | 657.44 mi (1,058.04 km) |
| Prospect Heights to California City (California) | 1,676.28 mi (2,697.70 km) |
| Prospect Heights to Callaway (Florida) | 837.39 mi (1,347.65 km) |
| Prospect Heights to Calumet City (Illinois) | 39.03 mi (62.81 km) |
| Prospect Heights to Calverton (Maryland) | 612.76 mi (986.14 km) |
| Prospect Heights to Camano (Washington) | 1,719.35 mi (2,767.02 km) |
