| Port Neches to Marrero (Louisiana) | 229.60 mi (369.51 km) |
| Port Neches to Marshall (Minnesota) | 1,005.00 mi (1,617.39 km) |
| Port Neches to Marshall (Missouri) | 632.80 mi (1,018.40 km) |
| Port Neches to Marshall (Texas) | 178.53 mi (287.31 km) |
| Port Neches to Marshalltown (Iowa) | 835.12 mi (1,343.99 km) |
| Port Neches to Marshfield (Wisconsin) | 1,035.37 mi (1,666.26 km) |
| Port Neches to Martha Lake (Washington) | 1,939.82 mi (3,121.84 km) |
| Port Neches to Martin (Tennessee) | 529.00 mi (851.35 km) |
| Port Neches to Martinez (California) | 1,698.53 mi (2,733.52 km) |
| Port Neches to Martinez (Georgia) | 737.36 mi (1,186.67 km) |
| Port Neches to Martinsburg (West Virginia) | 1,115.93 mi (1,795.91 km) |
| Port Neches to Martinsville (Indiana) | 778.72 mi (1,253.22 km) |
| Port Neches to Martinsville (New Jersey) | 1,311.53 mi (2,110.71 km) |
| Port Neches to Martinsville (Virginia) | 934.26 mi (1,503.55 km) |
| Port Neches to Maryland City (Maryland) | 1,158.48 mi (1,864.39 km) |
