| Site | State | Type | Population |
|---|---|---|---|
| Marshalltown, IA | Iowa | City | 27591 |
| Marshfield, WI | Wisconsin | City | 18929 |
| Martin County, FL | Florida | County | 159923 |
| Martinez, CA | California | City | 36819 |
| Martins Ferry, OH | Ohio | City | 6128 |
| Martinsburg, WV | West Virginia | City | 18835 |
| Maryland City, MD | Maryland | City | 19153 |
| Maryland Heights, MO | Missouri | City | 27472 |
| Marysville, MI | Michigan | City | 9959 |
| Maryville, TN | Tennessee | City | 31907 |
| Mason City, IA | Iowa | City | 27338 |
| Mason, OH | Ohio | City | 35089 |
| Massillon, OH | Ohio | City | 32146 |
| Mastic, NY | New York | City | 15404 |
| Mathews County, VA | Virginia | County | 8533 |
| Matteson, IL | Illinois | City | 19073 |
| Maui County, HI | Hawaii | County | 164754 |
| Maui, HI | Hawaii | City | 164754 |
| Mauldin, SC | South Carolina | City | 25654 |
| Mayfield, OH | Ohio | City | 3388 |
| Mayville, NY | New York | City | 1477 |
| Mayville, WI | Wisconsin | City | 5154 |
| Maywood, IL | Illinois | City | 23512 |
| McAlisterville, PA | Pennsylvania | City | 1188 |
| McAllen, TX | Texas | City | 142557 |
| McCracken County, KY | Kentucky | County | 67875 |
| McDonough, GA | Georgia | City | 29051 |
| McDowell County, NC | North Carolina | County | 44578 |
| McDowell County, WV | West Virginia | County | 19111 |
| McFarland, WI | Wisconsin | City | 8991 |
| McHenry County, IL | Illinois | County | 310229 |
| McKean County, PA | Pennsylvania | County | 40432 |
| McKeesport, PA | Pennsylvania | City | 17727 |
| McLennan County, TX | Texas | County | 263115 |
| McNairy County, TN | Tennessee | County | 25866 |
| Mebane, NC | North Carolina | City | 17797 |
| Mecklenburg County, VA | Virginia | County | 30319 |
| Mecosta County, MI | Michigan | County | 39714 |
| Medford Township, NJ | New Jersey | City | 24497 |
| Medford, OR | Oregon | City | 85824 |
| Medina County, OH | Ohio | County | 182470 |
| Medina, OH | Ohio | City | 26094 |
| Medina, WA | Washington | City | 2886 |
| Medora, ND | North Dakota | City | 121 |
| Melbourne, FL | Florida | City | 84678 |
| Memphis, TN | Tennessee | City | 628127 |
| Menifee, CA | California | City | 106401 |
| Menlo Park, CA | California | City | 33780 |
| Menominee County, MI | Michigan | County | 22902 |
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