| Romeoville to Cordele (Georgia) | 709.89 mi (1,142.45 km) |
| Romeoville to Corinth (Mississippi) | 462.39 mi (744.15 km) |
| Romeoville to Corinth (Texas) | 764.84 mi (1,230.89 km) |
| Romeoville to Cornelius (North Carolina) | 576.83 mi (928.33 km) |
| Romeoville to Cornelius (Oregon) | 1,755.81 mi (2,825.71 km) |
| Romeoville to Corning (New York) | 568.75 mi (915.31 km) |
| Romeoville to Corona (California) | 1,687.26 mi (2,715.38 km) |
| Romeoville to Coronado (California) | 1,706.08 mi (2,745.67 km) |
| Romeoville to Corpus Christi (Texas) | 1,094.32 mi (1,761.13 km) |
| Romeoville to Corsicana (Texas) | 804.87 mi (1,295.32 km) |
| Romeoville to Cortland (New York) | 614.13 mi (988.35 km) |
| Romeoville to Corvallis (Oregon) | 1,772.40 mi (2,852.40 km) |
| Romeoville to Coshocton (Ohio) | 339.62 mi (546.57 km) |
| Romeoville to Costa Mesa (California) | 1,711.23 mi (2,753.96 km) |
| Romeoville to Coto de Caza (California) | 1,696.80 mi (2,730.74 km) |
