| Walnut Creek to Mattoon (Illinois) | 1,808.93 mi (2,911.19 km) |
| Walnut Creek to Mauldin (South Carolina) | 2,205.32 mi (3,549.12 km) |
| Walnut Creek to Maumee (Ohio) | 2,037.81 mi (3,279.54 km) |
| Walnut Creek to Maumelle (Arkansas) | 1,655.22 mi (2,663.82 km) |
| Walnut Creek to Mayagüez (Puerto Rico) | 3,556.42 mi (5,723.50 km) |
| Walnut Creek to Mayfield Heights (Ohio) | 2,151.80 mi (3,462.99 km) |
| Walnut Creek to Mays Chapel (Maryland) | 2,424.73 mi (3,902.23 km) |
| Walnut Creek to Maywood (California) | 345.69 mi (556.34 km) |
| Walnut Creek to Maywood (Illinois) | 1,821.25 mi (2,931.02 km) |
| Walnut Creek to McAlester (Oklahoma) | 1,469.95 mi (2,365.65 km) |
| Walnut Creek to McAllen (Texas) | 1,602.89 mi (2,579.60 km) |
| Walnut Creek to McCalla (Alabama) | 1,980.48 mi (3,187.28 km) |
| Walnut Creek to McComb (Mississippi) | 1,844.33 mi (2,968.17 km) |
| Walnut Creek to McDonough (Georgia) | 2,134.20 mi (3,434.66 km) |
| Walnut Creek to McFarland (California) | 218.15 mi (351.07 km) |
