| Gretna to Merrick (New York) | 1,186.73 mi (1,909.86 km) |
| Gretna to Merrifield (Virginia) | 955.79 mi (1,538.19 km) |
| Gretna to Merrillville (Indiana) | 813.35 mi (1,308.97 km) |
| Gretna to Merritt Island (Florida) | 576.72 mi (928.14 km) |
| Gretna to Mesa (Arizona) | 1,294.41 mi (2,083.15 km) |
| Gretna to Mesquite (Nevada) | 1,464.32 mi (2,356.59 km) |
| Gretna to Mesquite (Texas) | 432.91 mi (696.70 km) |
| Gretna to Metairie (Louisiana) | 9.69 mi (15.60 km) |
| Gretna to Methuen Town (Massachusetts) | 1,368.23 mi (2,201.96 km) |
| Gretna to Metuchen (New Jersey) | 1,147.38 mi (1,846.53 km) |
| Gretna to Mexico (Missouri) | 647.57 mi (1,042.16 km) |
| Gretna to Miami (Florida) | 665.04 mi (1,070.27 km) |
| Gretna to Miami (Oklahoma) | 556.32 mi (895.30 km) |
| Gretna to Miami Beach (Florida) | 667.87 mi (1,074.84 km) |
| Gretna to Miami Gardens (Florida) | 658.20 mi (1,059.28 km) |
