| Gretna to Carlsbad (California) | 1,614.69 mi (2,598.59 km) |
| Gretna to Carlsbad (New Mexico) | 855.63 mi (1,377.01 km) |
| Gretna to Carmel (Indiana) | 728.88 mi (1,173.02 km) |
| Gretna to Carmichael (California) | 1,873.92 mi (3,015.78 km) |
| Gretna to Carney (Maryland) | 1,008.62 mi (1,623.22 km) |
| Gretna to Carnot-Moon (Pennsylvania) | 918.12 mi (1,477.58 km) |
| Gretna to Carol Stream (Illinois) | 836.54 mi (1,346.28 km) |
| Gretna to Carolina (Puerto Rico) | 1,707.82 mi (2,748.48 km) |
| Gretna to Carolina Forest (South Carolina) | 705.47 mi (1,135.34 km) |
| Gretna to Carpentersville (Illinois) | 849.48 mi (1,367.10 km) |
| Gretna to Carpinteria (California) | 1,744.63 mi (2,807.71 km) |
| Gretna to Carrboro (North Carolina) | 758.90 mi (1,221.33 km) |
| Gretna to Carroll (Iowa) | 881.79 mi (1,419.10 km) |
| Gretna to Carrollton (Georgia) | 386.62 mi (622.21 km) |
| Gretna to Carrollton (Texas) | 456.14 mi (734.09 km) |
