| Gretna to Cordele (Georgia) | 398.17 mi (640.79 km) |
| Gretna to Corinth (Mississippi) | 359.39 mi (578.38 km) |
| Gretna to Corinth (Texas) | 469.60 mi (755.75 km) |
| Gretna to Cornelius (North Carolina) | 656.78 mi (1,056.99 km) |
| Gretna to Cornelius (Oregon) | 2,079.79 mi (3,347.10 km) |
| Gretna to Corning (New York) | 1,111.83 mi (1,789.31 km) |
| Gretna to Corona (California) | 1,632.04 mi (2,626.52 km) |
| Gretna to Coronado (California) | 1,607.54 mi (2,587.09 km) |
| Gretna to Corpus Christi (Texas) | 468.32 mi (753.68 km) |
| Gretna to Corsicana (Texas) | 408.42 mi (657.29 km) |
| Gretna to Cortland (New York) | 1,165.69 mi (1,876.00 km) |
| Gretna to Corvallis (Oregon) | 2,069.12 mi (3,329.92 km) |
| Gretna to Coshocton (Ohio) | 851.53 mi (1,370.41 km) |
| Gretna to Costa Mesa (California) | 1,651.65 mi (2,658.08 km) |
| Gretna to Coto de Caza (California) | 1,632.70 mi (2,627.58 km) |
