| Romeoville to Cernavoda | 5,304.38 mi (8,536.57 km) |
| Romeoville to Chitila | 5,225.39 mi (8,409.45 km) |
| Romeoville to Cisnadie | 5,103.38 mi (8,213.10 km) |
| Romeoville to Cluj-Napoca | 5,033.50 mi (8,100.63 km) |
| Romeoville to Codlea | 5,148.80 mi (8,286.19 km) |
| Romeoville to Comanesti | 5,147.22 mi (8,283.65 km) |
| Romeoville to Comarnic | 5,177.08 mi (8,331.71 km) |
| Romeoville to Constanta | 5,333.37 mi (8,583.24 km) |
| Romeoville to Corabia | 5,209.24 mi (8,383.46 km) |
| Romeoville to Costesti | 5,179.11 mi (8,334.97 km) |
| Romeoville to Covasna | 5,166.69 mi (8,314.99 km) |
| Romeoville to Craiova | 5,157.83 mi (8,300.72 km) |
| Romeoville to Cristuru Secuiesc | 5,106.01 mi (8,217.32 km) |
| Romeoville to Cugir | 5,069.71 mi (8,158.92 km) |
| Romeoville to Cumpana | 5,333.46 mi (8,583.37 km) |
