| Gretna to Candler-McAfee (Georgia) | 429.58 mi (691.35 km) |
| Gretna to Caño Martin Peña (Puerto Rico) | 1,702.92 mi (2,740.58 km) |
| Gretna to Cañon City (Colorado) | 1,046.28 mi (1,683.82 km) |
| Gretna to Canóvanas (Puerto Rico) | 1,713.50 mi (2,757.61 km) |
| Gretna to Canton (Georgia) | 442.34 mi (711.88 km) |
| Gretna to Canton (Illinois) | 736.06 mi (1,184.57 km) |
| Gretna to Canton (Mississippi) | 185.69 mi (298.83 km) |
| Gretna to Canton (Ohio) | 896.89 mi (1,443.41 km) |
| Gretna to Canyon (Texas) | 775.13 mi (1,247.45 km) |
| Gretna to Canyon Lake (California) | 1,614.26 mi (2,597.90 km) |
| Gretna to Canyon Lake (Texas) | 491.66 mi (791.26 km) |
| Gretna to Cape Coral (Florida) | 539.43 mi (868.12 km) |
| Gretna to Cape Girardeau (Missouri) | 512.13 mi (824.19 km) |
| Gretna to Carbondale (Illinois) | 541.84 mi (872.00 km) |
| Gretna to Carlisle (Pennsylvania) | 1,014.54 mi (1,632.74 km) |
