| Round Lake Beach to Conyers (Georgia) | 641.63 mi (1,032.60 km) |
| Round Lake Beach to Cookeville (Tennessee) | 451.87 mi (727.22 km) |
| Round Lake Beach to Coolidge (Arizona) | 1,432.19 mi (2,304.88 km) |
| Round Lake Beach to Coon Rapids (Minnesota) | 324.48 mi (522.20 km) |
| Round Lake Beach to Cooper City (Florida) | 1,211.83 mi (1,950.25 km) |
| Round Lake Beach to Coos Bay (Oregon) | 1,817.31 mi (2,924.67 km) |
| Round Lake Beach to Copiague (New York) | 767.94 mi (1,235.88 km) |
| Round Lake Beach to Coppell (Texas) | 811.74 mi (1,306.36 km) |
| Round Lake Beach to Copperas Cove (Texas) | 948.04 mi (1,525.72 km) |
| Round Lake Beach to Coral Gables (Florida) | 1,234.48 mi (1,986.70 km) |
| Round Lake Beach to Coral Springs (Florida) | 1,197.81 mi (1,927.70 km) |
| Round Lake Beach to Coral Terrace (Florida) | 1,231.01 mi (1,981.12 km) |
| Round Lake Beach to Coralville (Iowa) | 186.41 mi (299.99 km) |
| Round Lake Beach to Coram (New York) | 784.33 mi (1,262.25 km) |
| Round Lake Beach to Corcoran (California) | 1,729.21 mi (2,782.90 km) |
