| Round Lake Beach to Castle Pines (Colorado) | 897.79 mi (1,444.86 km) |
| Round Lake Beach to Castle Rock (Colorado) | 898.82 mi (1,446.52 km) |
| Round Lake Beach to Castro Valley (California) | 1,813.69 mi (2,918.86 km) |
| Round Lake Beach to Catalina Foothills (Arizona) | 1,426.42 mi (2,295.60 km) |
| Round Lake Beach to Cataño (Puerto Rico) | 2,094.91 mi (3,371.43 km) |
| Round Lake Beach to Cathedral City (California) | 1,642.61 mi (2,643.52 km) |
| Round Lake Beach to Catonsville (Maryland) | 630.09 mi (1,014.03 km) |
| Round Lake Beach to Cave Spring (Virginia) | 556.75 mi (896.00 km) |
| Round Lake Beach to Cayce (South Carolina) | 696.34 mi (1,120.64 km) |
| Round Lake Beach to Cayey (Puerto Rico) | 2,112.93 mi (3,400.42 km) |
| Round Lake Beach to Cedar City (Utah) | 1,357.17 mi (2,184.16 km) |
| Round Lake Beach to Cedar Falls (Iowa) | 223.11 mi (359.05 km) |
| Round Lake Beach to Cedar Hill (Texas) | 832.76 mi (1,340.20 km) |
| Round Lake Beach to Cedar Lake (Indiana) | 77.18 mi (124.21 km) |
| Round Lake Beach to Cedar Mill (Oregon) | 1,726.90 mi (2,779.18 km) |
