| Port Neches to Mattoon (Illinois) | 728.61 mi (1,172.58 km) |
| Port Neches to Mauldin (South Carolina) | 755.46 mi (1,215.80 km) |
| Port Neches to Maumee (Ohio) | 985.21 mi (1,585.54 km) |
| Port Neches to Maumelle (Arkansas) | 348.72 mi (561.21 km) |
| Port Neches to Mayagüez (Puerto Rico) | 1,869.74 mi (3,009.06 km) |
| Port Neches to Mayfield Heights (Ohio) | 1,059.09 mi (1,704.45 km) |
| Port Neches to Mays Chapel (Maryland) | 1,176.54 mi (1,893.46 km) |
| Port Neches to Maywood (California) | 1,443.92 mi (2,323.77 km) |
| Port Neches to Maywood (Illinois) | 889.85 mi (1,432.07 km) |
| Port Neches to McAlester (Oklahoma) | 358.15 mi (576.39 km) |
| Port Neches to McAllen (Texas) | 368.56 mi (593.14 km) |
| Port Neches to McCalla (Alabama) | 467.06 mi (751.65 km) |
| Port Neches to McComb (Mississippi) | 224.38 mi (361.11 km) |
| Port Neches to McDonough (Georgia) | 623.16 mi (1,002.89 km) |
| Port Neches to McFarland (California) | 1,515.81 mi (2,439.45 km) |
