| Round Lake Beach to Carrollwood (Florida) | 1,037.57 mi (1,669.80 km) |
| Round Lake Beach to Carson (California) | 1,732.41 mi (2,788.04 km) |
| Round Lake Beach to Carson City (Nevada) | 1,662.31 mi (2,675.24 km) |
| Round Lake Beach to Carteret (New Jersey) | 726.83 mi (1,169.72 km) |
| Round Lake Beach to Cartersville (Georgia) | 594.68 mi (957.05 km) |
| Round Lake Beach to Carthage (Missouri) | 490.02 mi (788.61 km) |
| Round Lake Beach to Cary (Illinois) | 14.35 mi (23.09 km) |
| Round Lake Beach to Cary (North Carolina) | 673.42 mi (1,083.77 km) |
| Round Lake Beach to Casa de Oro-Mount Helix (California) | 1,705.19 mi (2,744.23 km) |
| Round Lake Beach to Casa Grande (Arizona) | 1,444.74 mi (2,325.08 km) |
| Round Lake Beach to Casas Adobes (Arizona) | 1,430.96 mi (2,302.90 km) |
| Round Lake Beach to Cascades (Virginia) | 604.98 mi (973.63 km) |
| Round Lake Beach to Casper (Wyoming) | 926.24 mi (1,490.64 km) |
| Round Lake Beach to Casselberry (Florida) | 1,020.23 mi (1,641.91 km) |
| Round Lake Beach to Castaic (California) | 1,730.33 mi (2,784.70 km) |
