| Gretna to Cadillac (Michigan) | 1,022.70 mi (1,645.87 km) |
| Gretna to Caguas (Puerto Rico) | 1,710.96 mi (2,753.52 km) |
| Gretna to Cahokia (Illinois) | 598.04 mi (962.45 km) |
| Gretna to Calabasas (California) | 1,695.91 mi (2,729.30 km) |
| Gretna to Caldwell (Idaho) | 1,739.79 mi (2,799.92 km) |
| Gretna to Caledonia (Wisconsin) | 898.61 mi (1,446.17 km) |
| Gretna to Calera (Alabama) | 295.40 mi (475.40 km) |
| Gretna to Calexico (California) | 1,510.65 mi (2,431.15 km) |
| Gretna to Calhoun (Georgia) | 435.22 mi (700.42 km) |
| Gretna to California (Maryland) | 966.38 mi (1,555.23 km) |
| Gretna to California City (California) | 1,654.83 mi (2,663.20 km) |
| Gretna to Callaway (Florida) | 269.32 mi (433.42 km) |
| Gretna to Calumet City (Illinois) | 820.58 mi (1,320.60 km) |
| Gretna to Calverton (Maryland) | 976.06 mi (1,570.82 km) |
| Gretna to Camano (Washington) | 2,124.00 mi (3,418.25 km) |
