| Gretna to Marshall (Minnesota) | 1,052.31 mi (1,693.53 km) |
| Gretna to Marshall (Missouri) | 660.64 mi (1,063.20 km) |
| Gretna to Marshall (Texas) | 312.19 mi (502.42 km) |
| Gretna to Marshalltown (Iowa) | 852.64 mi (1,372.18 km) |
| Gretna to Marshfield (Wisconsin) | 1,019.33 mi (1,640.45 km) |
| Gretna to Martha Lake (Washington) | 2,104.29 mi (3,386.52 km) |
| Gretna to Martin (Tennessee) | 449.54 mi (723.47 km) |
| Gretna to Martinez (California) | 1,909.99 mi (3,073.84 km) |
| Gretna to Martinez (Georgia) | 529.61 mi (852.33 km) |
| Gretna to Martinsburg (West Virginia) | 950.04 mi (1,528.93 km) |
| Gretna to Martinsville (Indiana) | 688.01 mi (1,107.25 km) |
| Gretna to Martinsville (New Jersey) | 1,140.69 mi (1,835.77 km) |
| Gretna to Martinsville (Virginia) | 750.95 mi (1,208.54 km) |
| Gretna to Maryland City (Maryland) | 984.07 mi (1,583.70 km) |
| Gretna to Maryland Heights (Missouri) | 609.11 mi (980.26 km) |
