| Napa to Mattoon (Illinois) | 1,816.26 mi (2,922.99 km) |
| Napa to Mauldin (South Carolina) | 2,216.34 mi (3,566.85 km) |
| Napa to Maumee (Ohio) | 2,042.31 mi (3,286.79 km) |
| Napa to Maumelle (Arkansas) | 1,668.73 mi (2,685.56 km) |
| Napa to Mayagüez (Puerto Rico) | 3,573.66 mi (5,751.25 km) |
| Napa to Mayfield Heights (Ohio) | 2,156.15 mi (3,469.99 km) |
| Napa to Mays Chapel (Maryland) | 2,430.46 mi (3,911.44 km) |
| Napa to Maywood (California) | 375.81 mi (604.81 km) |
| Napa to Maywood (Illinois) | 1,825.70 mi (2,938.17 km) |
| Napa to McAlester (Oklahoma) | 1,484.34 mi (2,388.82 km) |
| Napa to McAllen (Texas) | 1,626.80 mi (2,618.08 km) |
| Napa to McCalla (Alabama) | 1,994.09 mi (3,209.18 km) |
| Napa to McComb (Mississippi) | 1,860.93 mi (2,994.88 km) |
| Napa to McDonough (Georgia) | 2,146.89 mi (3,455.08 km) |
| Napa to McFarland (California) | 247.49 mi (398.30 km) |
