| Gretna to Medford (New York) | 1,218.05 mi (1,960.26 km) |
| Gretna to Medford (Oregon) | 2,005.50 mi (3,227.54 km) |
| Gretna to Medina (Ohio) | 900.80 mi (1,449.70 km) |
| Gretna to Medulla (Florida) | 505.87 mi (814.12 km) |
| Gretna to Mehlville (Missouri) | 593.82 mi (955.66 km) |
| Gretna to Melbourne (Florida) | 580.62 mi (934.42 km) |
| Gretna to Melissa (Texas) | 448.28 mi (721.43 km) |
| Gretna to Melrose (Massachusetts) | 1,363.04 mi (2,193.60 km) |
| Gretna to Melrose Park (Illinois) | 837.54 mi (1,347.89 km) |
| Gretna to Melville (New York) | 1,198.05 mi (1,928.07 km) |
| Gretna to Melvindale (Michigan) | 936.06 mi (1,506.44 km) |
| Gretna to Memphis (Florida) | 482.29 mi (776.16 km) |
| Gretna to Memphis (Tennessee) | 359.22 mi (578.11 km) |
| Gretna to Menasha (Wisconsin) | 992.19 mi (1,596.78 km) |
| Gretna to Mendota (California) | 1,805.00 mi (2,904.87 km) |
