| Gary to McKeesport (Pennsylvania) | 400.72 mi (644.89 km) |
| Gary to McKinleyville (California) | 1,893.84 mi (3,047.84 km) |
| Gary to McKinney (Texas) | 772.11 mi (1,242.60 km) |
| Gary to McLean (Virginia) | 565.24 mi (909.66 km) |
| Gary to McMinnville (Oregon) | 1,801.65 mi (2,899.48 km) |
| Gary to McMinnville (Tennessee) | 416.58 mi (670.41 km) |
| Gary to McNair (Virginia) | 554.23 mi (891.95 km) |
| Gary to McPherson (Kansas) | 589.09 mi (948.05 km) |
| Gary to Mead Valley (California) | 1,711.86 mi (2,754.97 km) |
| Gary to Meadow Woods (Florida) | 973.91 mi (1,567.36 km) |
| Gary to Meadowbrook (Virginia) | 599.15 mi (964.24 km) |
| Gary to Meadville (Pennsylvania) | 371.84 mi (598.41 km) |
| Gary to Mebane (North Carolina) | 577.01 mi (928.61 km) |
| Gary to Mechanicsville (Virginia) | 597.69 mi (961.90 km) |
| Gary to Medford (Massachusetts) | 834.41 mi (1,342.85 km) |
