| Gretna to Cloverleaf (Texas) | 306.97 mi (494.02 km) |
| Gretna to Cloverly (Maryland) | 975.88 mi (1,570.52 km) |
| Gretna to Clovis (California) | 1,767.41 mi (2,844.36 km) |
| Gretna to Clovis (New Mexico) | 828.89 mi (1,333.97 km) |
| Gretna to Clute (Texas) | 327.31 mi (526.75 km) |
| Gretna to Coachella (California) | 1,549.97 mi (2,494.44 km) |
| Gretna to Coalinga (California) | 1,797.85 mi (2,893.36 km) |
| Gretna to Coamo (Puerto Rico) | 1,698.88 mi (2,734.08 km) |
| Gretna to Coatesville (Pennsylvania) | 1,062.52 mi (1,709.95 km) |
| Gretna to Cockeysville (Maryland) | 1,007.20 mi (1,620.93 km) |
| Gretna to Cocoa (Florida) | 569.93 mi (917.21 km) |
| Gretna to Cocoa Beach (Florida) | 578.99 mi (931.80 km) |
| Gretna to Coconut Creek (Florida) | 651.30 mi (1,048.17 km) |
| Gretna to Coeur d'Alene (Idaho) | 1,876.28 mi (3,019.57 km) |
| Gretna to Cohoes (New York) | 1,267.33 mi (2,039.58 km) |
