| Walnut Creek to McHenry (Illinois) | 1,797.03 mi (2,892.05 km) |
| Walnut Creek to McKeesport (Pennsylvania) | 2,246.66 mi (3,615.65 km) |
| Walnut Creek to McKinleyville (California) | 237.10 mi (381.58 km) |
| Walnut Creek to McKinney (Texas) | 1,457.93 mi (2,346.31 km) |
| Walnut Creek to McLean (Virginia) | 2,403.72 mi (3,868.42 km) |
| Walnut Creek to McMinnville (Oregon) | 508.46 mi (818.29 km) |
| Walnut Creek to McMinnville (Tennessee) | 1,999.40 mi (3,217.72 km) |
| Walnut Creek to McNair (Virginia) | 2,392.22 mi (3,849.91 km) |
| Walnut Creek to McPherson (Kansas) | 1,321.42 mi (2,126.62 km) |
| Walnut Creek to Mead Valley (California) | 387.08 mi (622.94 km) |
| Walnut Creek to Meadow Woods (Florida) | 2,424.00 mi (3,901.06 km) |
| Walnut Creek to Meadowbrook (Virginia) | 2,413.88 mi (3,884.77 km) |
| Walnut Creek to Meadville (Pennsylvania) | 2,217.67 mi (3,568.99 km) |
| Walnut Creek to Mebane (North Carolina) | 2,342.64 mi (3,770.12 km) |
| Walnut Creek to Mechanicsville (Virginia) | 2,416.70 mi (3,889.30 km) |
