| Gretna to Mitchell (South Dakota) | 1,050.69 mi (1,690.92 km) |
| Gretna to Mitchellville (Maryland) | 976.94 mi (1,572.23 km) |
| Gretna to Moberly (Missouri) | 670.68 mi (1,079.36 km) |
| Gretna to Mobile (Alabama) | 127.07 mi (204.49 km) |
| Gretna to Modesto (California) | 1,846.51 mi (2,971.67 km) |
| Gretna to Mokena (Illinois) | 812.16 mi (1,307.05 km) |
| Gretna to Moline (Illinois) | 799.93 mi (1,287.36 km) |
| Gretna to Moncks Corner (South Carolina) | 632.43 mi (1,017.79 km) |
| Gretna to Monfort Heights (Ohio) | 711.26 mi (1,144.66 km) |
| Gretna to Monmouth (Oregon) | 2,072.86 mi (3,335.94 km) |
| Gretna to Monroe (Georgia) | 458.57 mi (737.99 km) |
| Gretna to Monroe (Louisiana) | 216.35 mi (348.18 km) |
| Gretna to Monroe (Michigan) | 908.77 mi (1,462.52 km) |
| Gretna to Monroe (North Carolina) | 655.41 mi (1,054.78 km) |
| Gretna to Monroe (Ohio) | 733.37 mi (1,180.25 km) |
