| Gretna to Monticello (Minnesota) | 1,082.56 mi (1,742.21 km) |
| Gretna to Montrose (Colorado) | 1,173.99 mi (1,889.36 km) |
| Gretna to Moody (Alabama) | 329.45 mi (530.20 km) |
| Gretna to Moore (Oklahoma) | 571.38 mi (919.55 km) |
| Gretna to Moorestown-Lenola (New Jersey) | 1,098.62 mi (1,768.06 km) |
| Gretna to Mooresville (North Carolina) | 663.62 mi (1,068.00 km) |
| Gretna to Moorhead (Minnesota) | 1,225.28 mi (1,971.90 km) |
| Gretna to Moorpark (California) | 1,708.15 mi (2,749.01 km) |
| Gretna to Moraga (California) | 1,909.00 mi (3,072.24 km) |
| Gretna to Moreno Valley (California) | 1,611.56 mi (2,593.55 km) |
| Gretna to Morgan City (Louisiana) | 69.84 mi (112.40 km) |
| Gretna to Morgan Hill (California) | 1,877.22 mi (3,021.09 km) |
| Gretna to Morganton (North Carolina) | 629.95 mi (1,013.80 km) |
| Gretna to Morgantown (West Virginia) | 882.31 mi (1,419.95 km) |
| Gretna to Morris (Illinois) | 797.31 mi (1,283.15 km) |
