| Round Lake Beach to Cibolo (Texas) | 1,049.39 mi (1,688.82 km) |
| Round Lake Beach to Cicero (Illinois) | 40.45 mi (65.10 km) |
| Round Lake Beach to Cimarron Hills (Colorado) | 903.17 mi (1,453.51 km) |
| Round Lake Beach to Cincinnati (Ohio) | 291.58 mi (469.25 km) |
| Round Lake Beach to Cinco Ranch (Texas) | 971.92 mi (1,564.16 km) |
| Round Lake Beach to Circleville (Ohio) | 329.71 mi (530.61 km) |
| Round Lake Beach to Citrus (California) | 1,704.74 mi (2,743.51 km) |
| Round Lake Beach to Citrus Heights (California) | 1,750.84 mi (2,817.71 km) |
| Round Lake Beach to Citrus Park (Florida) | 1,035.74 mi (1,666.87 km) |
| Round Lake Beach to Claiborne (Louisiana) | 716.22 mi (1,152.65 km) |
| Round Lake Beach to Claremont (California) | 1,695.67 mi (2,728.92 km) |
| Round Lake Beach to Claremont (New Hampshire) | 798.94 mi (1,285.77 km) |
| Round Lake Beach to Claremore (Oklahoma) | 580.37 mi (934.02 km) |
| Round Lake Beach to Clarksburg (Maryland) | 605.64 mi (974.69 km) |
| Round Lake Beach to Clarksburg (West Virginia) | 458.16 mi (737.34 km) |
