| Round Lake Beach to Cadillac (Michigan) | 186.11 mi (299.51 km) |
| Round Lake Beach to Caguas (Puerto Rico) | 2,110.58 mi (3,396.65 km) |
| Round Lake Beach to Cahokia (Illinois) | 285.65 mi (459.71 km) |
| Round Lake Beach to Calabasas (California) | 1,743.32 mi (2,805.60 km) |
| Round Lake Beach to Caldwell (Idaho) | 1,439.33 mi (2,316.38 km) |
| Round Lake Beach to Caledonia (Wisconsin) | 30.80 mi (49.57 km) |
| Round Lake Beach to Calera (Alabama) | 643.50 mi (1,035.61 km) |
| Round Lake Beach to Calexico (California) | 1,635.12 mi (2,631.47 km) |
| Round Lake Beach to Calhoun (Georgia) | 570.82 mi (918.64 km) |
| Round Lake Beach to California (Maryland) | 671.46 mi (1,080.61 km) |
| Round Lake Beach to California City (California) | 1,670.77 mi (2,688.84 km) |
| Round Lake Beach to Callaway (Florida) | 857.49 mi (1,379.99 km) |
| Round Lake Beach to Calumet City (Illinois) | 59.51 mi (95.77 km) |
| Round Lake Beach to Calverton (Maryland) | 625.90 mi (1,007.29 km) |
| Round Lake Beach to Camano (Washington) | 1,703.97 mi (2,742.27 km) |
