| Gretna to Cibolo (Texas) | 490.04 mi (788.64 km) |
| Gretna to Cicero (Illinois) | 834.42 mi (1,342.87 km) |
| Gretna to Cimarron Hills (Colorado) | 1,036.99 mi (1,668.87 km) |
| Gretna to Cincinnati (Ohio) | 711.27 mi (1,144.68 km) |
| Gretna to Cinco Ranch (Texas) | 342.39 mi (551.02 km) |
| Gretna to Circleville (Ohio) | 781.70 mi (1,258.03 km) |
| Gretna to Citrus (California) | 1,651.29 mi (2,657.49 km) |
| Gretna to Citrus Heights (California) | 1,872.58 mi (3,013.63 km) |
| Gretna to Citrus Park (Florida) | 469.94 mi (756.29 km) |
| Gretna to Claiborne (Louisiana) | 221.46 mi (356.41 km) |
| Gretna to Claremont (California) | 1,641.38 mi (2,641.55 km) |
| Gretna to Claremont (New Hampshire) | 1,347.54 mi (2,168.65 km) |
| Gretna to Claremore (Oklahoma) | 546.81 mi (880.01 km) |
| Gretna to Clarksburg (Maryland) | 969.44 mi (1,560.17 km) |
| Gretna to Clarksburg (West Virginia) | 850.83 mi (1,369.28 km) |
