| Gretna to Carrollwood (Florida) | 473.04 mi (761.29 km) |
| Gretna to Carson (California) | 1,671.62 mi (2,690.21 km) |
| Gretna to Carson City (Nevada) | 1,796.92 mi (2,891.87 km) |
| Gretna to Carteret (New Jersey) | 1,154.85 mi (1,858.55 km) |
| Gretna to Cartersville (Georgia) | 425.28 mi (684.43 km) |
| Gretna to Carthage (Missouri) | 557.28 mi (896.86 km) |
| Gretna to Cary (Illinois) | 855.92 mi (1,377.47 km) |
| Gretna to Cary (North Carolina) | 767.10 mi (1,234.53 km) |
| Gretna to Casa de Oro-Mount Helix (California) | 1,596.37 mi (2,569.10 km) |
| Gretna to Casa Grande (Arizona) | 1,294.53 mi (2,083.35 km) |
| Gretna to Casas Adobes (Arizona) | 1,248.99 mi (2,010.05 km) |
| Gretna to Cascades (Virginia) | 956.77 mi (1,539.78 km) |
| Gretna to Casper (Wyoming) | 1,267.43 mi (2,039.73 km) |
| Gretna to Casselberry (Florida) | 532.95 mi (857.71 km) |
| Gretna to Castaic (California) | 1,694.76 mi (2,727.46 km) |
