| Gretna to Conyers (Georgia) | 440.02 mi (708.14 km) |
| Gretna to Cookeville (Tennessee) | 504.76 mi (812.34 km) |
| Gretna to Coolidge (Arizona) | 1,280.94 mi (2,061.47 km) |
| Gretna to Coon Rapids (Minnesota) | 1,069.48 mi (1,721.17 km) |
| Gretna to Cooper City (Florida) | 652.59 mi (1,050.25 km) |
| Gretna to Coos Bay (Oregon) | 2,091.39 mi (3,365.76 km) |
| Gretna to Copiague (New York) | 1,194.52 mi (1,922.39 km) |
| Gretna to Coppell (Texas) | 460.11 mi (740.48 km) |
| Gretna to Copperas Cove (Texas) | 475.29 mi (764.91 km) |
| Gretna to Coral Gables (Florida) | 664.25 mi (1,069.01 km) |
| Gretna to Coral Springs (Florida) | 647.39 mi (1,041.87 km) |
| Gretna to Coral Terrace (Florida) | 661.03 mi (1,063.83 km) |
| Gretna to Coralville (Iowa) | 819.08 mi (1,318.18 km) |
| Gretna to Coram (New York) | 1,219.40 mi (1,962.43 km) |
| Gretna to Corcoran (California) | 1,755.08 mi (2,824.53 km) |
