| Gretna to Marysville (California) | 1,893.55 mi (3,047.37 km) |
| Gretna to Marysville (Ohio) | 806.48 mi (1,297.90 km) |
| Gretna to Marysville (Washington) | 2,107.77 mi (3,392.13 km) |
| Gretna to Maryville (Missouri) | 770.21 mi (1,239.53 km) |
| Gretna to Maryville (Tennessee) | 535.41 mi (861.65 km) |
| Gretna to Mason (Ohio) | 729.56 mi (1,174.11 km) |
| Gretna to Mason City (Iowa) | 931.05 mi (1,498.39 km) |
| Gretna to Massapequa (New York) | 1,190.97 mi (1,916.68 km) |
| Gretna to Massapequa Park (New York) | 1,192.42 mi (1,919.02 km) |
| Gretna to Massillon (Ohio) | 890.76 mi (1,433.54 km) |
| Gretna to Mastic (New York) | 1,223.66 mi (1,969.28 km) |
| Gretna to Mastic Beach (New York) | 1,222.54 mi (1,967.48 km) |
| Gretna to Matteson (Illinois) | 811.71 mi (1,306.33 km) |
| Gretna to Matthews (North Carolina) | 652.02 mi (1,049.32 km) |
| Gretna to Mattoon (Illinois) | 667.93 mi (1,074.92 km) |
