| Round Lake Beach to Cullman (Alabama) | 570.64 mi (918.35 km) |
| Round Lake Beach to Culpeper (Virginia) | 594.51 mi (956.76 km) |
| Round Lake Beach to Culver City (California) | 1,733.92 mi (2,790.48 km) |
| Round Lake Beach to Cumberland (Maryland) | 520.93 mi (838.35 km) |
| Round Lake Beach to Cupertino (California) | 1,822.75 mi (2,933.44 km) |
| Round Lake Beach to Cutler Bay (Florida) | 1,241.49 mi (1,997.99 km) |
| Round Lake Beach to Cutlerville (Michigan) | 126.51 mi (203.60 km) |
| Round Lake Beach to Cuyahoga Falls (Ohio) | 348.23 mi (560.42 km) |
| Round Lake Beach to Cypress (California) | 1,722.16 mi (2,771.55 km) |
| Round Lake Beach to Cypress Gardens (Florida) | 1,056.03 mi (1,699.51 km) |
| Round Lake Beach to Cypress Lake (Florida) | 1,148.84 mi (1,848.88 km) |
| Round Lake Beach to D'Iberville (Mississippi) | 824.03 mi (1,326.14 km) |
| Round Lake Beach to Dakota Ridge (Colorado) | 907.82 mi (1,460.99 km) |
| Round Lake Beach to Dale City (Virginia) | 619.45 mi (996.91 km) |
| Round Lake Beach to Dallas (Georgia) | 610.58 mi (982.64 km) |
