| Gretna to Mendota Heights (Minnesota) | 1,048.01 mi (1,686.60 km) |
| Gretna to Menifee (California) | 1,609.83 mi (2,590.77 km) |
| Gretna to Menlo Park (California) | 1,908.42 mi (3,071.31 km) |
| Gretna to Menomonee Falls (Wisconsin) | 920.87 mi (1,482.00 km) |
| Gretna to Menomonie (Wisconsin) | 1,039.89 mi (1,673.54 km) |
| Gretna to Mentor (Ohio) | 947.94 mi (1,525.56 km) |
| Gretna to Mequon (Wisconsin) | 927.71 mi (1,493.01 km) |
| Gretna to Merced (California) | 1,815.00 mi (2,920.96 km) |
| Gretna to Mercedes (Texas) | 544.99 mi (877.07 km) |
| Gretna to Mercer Island (Washington) | 2,096.29 mi (3,373.65 km) |
| Gretna to Mercerville (New Jersey) | 1,121.08 mi (1,804.21 km) |
| Gretna to Meriden (Connecticut) | 1,253.67 mi (2,017.59 km) |
| Gretna to Meridian (Idaho) | 1,726.90 mi (2,779.18 km) |
| Gretna to Meridian (Mississippi) | 188.98 mi (304.14 km) |
| Gretna to Merriam (Kansas) | 682.36 mi (1,098.15 km) |
