| Romeoville to Carrollwood (Florida) | 989.31 mi (1,592.14 km) |
| Romeoville to Carson (California) | 1,723.30 mi (2,773.39 km) |
| Romeoville to Carson City (Nevada) | 1,664.83 mi (2,679.29 km) |
| Romeoville to Carteret (New Jersey) | 724.95 mi (1,166.70 km) |
| Romeoville to Cartersville (Georgia) | 546.28 mi (879.15 km) |
| Romeoville to Carthage (Missouri) | 453.96 mi (730.57 km) |
| Romeoville to Cary (Illinois) | 40.88 mi (65.79 km) |
| Romeoville to Cary (North Carolina) | 642.56 mi (1,034.10 km) |
| Romeoville to Casa de Oro-Mount Helix (California) | 1,693.01 mi (2,724.64 km) |
| Romeoville to Casa Grande (Arizona) | 1,427.70 mi (2,297.66 km) |
| Romeoville to Casas Adobes (Arizona) | 1,411.96 mi (2,272.32 km) |
| Romeoville to Cascades (Virginia) | 591.29 mi (951.59 km) |
| Romeoville to Casper (Wyoming) | 934.00 mi (1,503.13 km) |
| Romeoville to Casselberry (Florida) | 973.66 mi (1,566.95 km) |
| Romeoville to Castaic (California) | 1,722.74 mi (2,772.48 km) |
