| Gretna to Manor (Texas) | 447.43 mi (720.07 km) |
| Gretna to Manorville (New York) | 1,227.92 mi (1,976.14 km) |
| Gretna to Mansfield (Ohio) | 860.79 mi (1,385.31 km) |
| Gretna to Mansfield (Texas) | 456.13 mi (734.07 km) |
| Gretna to Manteca (California) | 1,860.04 mi (2,993.45 km) |
| Gretna to Manville (New Jersey) | 1,137.65 mi (1,830.86 km) |
| Gretna to Maple Grove (Minnesota) | 1,066.38 mi (1,716.17 km) |
| Gretna to Maple Heights (Ohio) | 925.36 mi (1,489.22 km) |
| Gretna to Maple Valley (Washington) | 2,082.34 mi (3,351.21 km) |
| Gretna to Mapleton (Utah) | 1,401.91 mi (2,256.15 km) |
| Gretna to Maplewood (Minnesota) | 1,054.01 mi (1,696.26 km) |
| Gretna to Marana (Arizona) | 1,257.66 mi (2,024.01 km) |
| Gretna to Marco Island (Florida) | 578.98 mi (931.78 km) |
| Gretna to Margate (Florida) | 650.73 mi (1,047.25 km) |
| Gretna to Maricopa (Arizona) | 1,308.90 mi (2,106.48 km) |
