| Gretna to Camarillo (California) | 1,716.86 mi (2,763.02 km) |
| Gretna to Camas (Washington) | 2,053.55 mi (3,304.87 km) |
| Gretna to Cambridge (Maryland) | 994.84 mi (1,601.04 km) |
| Gretna to Cambridge (Massachusetts) | 1,357.48 mi (2,184.66 km) |
| Gretna to Camden (Arkansas) | 301.34 mi (484.96 km) |
| Gretna to Camden (New Jersey) | 1,091.22 mi (1,756.15 km) |
| Gretna to Cameron Park (California) | 1,856.34 mi (2,987.50 km) |
| Gretna to Camp Pendleton South (California) | 1,621.10 mi (2,608.91 km) |
| Gretna to Camp Springs (Maryland) | 967.08 mi (1,556.36 km) |
| Gretna to Camp Verde (Arizona) | 1,311.41 mi (2,110.51 km) |
| Gretna to Campbell (California) | 1,895.37 mi (3,050.30 km) |
| Gretna to Campbellsville (Kentucky) | 580.28 mi (933.88 km) |
| Gretna to Campton Hills (Illinois) | 836.83 mi (1,346.75 km) |
| Gretna to Canby (Oregon) | 2,057.24 mi (3,310.80 km) |
| Gretna to Candelaria (Puerto Rico) | 1,694.67 mi (2,727.31 km) |
