| Round Lake Beach to Cordele (Georgia) | 757.98 mi (1,219.85 km) |
| Round Lake Beach to Corinth (Mississippi) | 514.01 mi (827.22 km) |
| Round Lake Beach to Corinth (Texas) | 804.08 mi (1,294.04 km) |
| Round Lake Beach to Cornelius (North Carolina) | 613.91 mi (987.99 km) |
| Round Lake Beach to Cornelius (Oregon) | 1,739.08 mi (2,798.78 km) |
| Round Lake Beach to Corning (New York) | 563.58 mi (906.99 km) |
| Round Lake Beach to Corona (California) | 1,696.89 mi (2,730.87 km) |
| Round Lake Beach to Coronado (California) | 1,718.26 mi (2,765.28 km) |
| Round Lake Beach to Corpus Christi (Texas) | 1,139.12 mi (1,833.24 km) |
| Round Lake Beach to Corsicana (Texas) | 846.89 mi (1,362.94 km) |
| Round Lake Beach to Cortland (New York) | 606.13 mi (975.47 km) |
| Round Lake Beach to Corvallis (Oregon) | 1,757.52 mi (2,828.45 km) |
| Round Lake Beach to Coshocton (Ohio) | 354.87 mi (571.11 km) |
| Round Lake Beach to Costa Mesa (California) | 1,720.93 mi (2,769.57 km) |
| Round Lake Beach to Coto de Caza (California) | 1,706.91 mi (2,747.01 km) |
