| Marshall | 31,000 | Benton | Kentucky | Paducah, KY | View → |
| Marshall | 16,000 | Madill | Oklahoma | Sherman, TX | View → |
| Marshall | 4,500 | Britton | South Dakota | Sioux Falls-Rapid City, SD | View → |
| Marshall | 30,000 | Moundsville | West Virginia | Wheeling-Clarksburg-Parkersburg, WV | View → |
| Marshall | 9,600 | Marysville | Kansas | Wichita, KS | View → |
| Martin | 11,600 | Inez | Kentucky | Charleston-Bluefield, WV | View → |
| Martin | 5,800 | Stanton | Texas | El Paso-Odessa, TX | View → |
| Martin | 10,500 | Loogootee | Indiana | Indianapolis-Fort Wayne, IN | View → |
| Martin | 167,500 | Stuart | Florida | Miami-West Palm Beach, FL | View → |
| Martin | 19,000 | Fairmont | Minnesota | Minneapolis-St. Paul, MN | View → |
| Martin | 23,000 | Williamston | North Carolina | Raleigh-Greenville-Wilmington, NC | View → |
| Martinsville City | 13,000 | Martinsville | Virginia | Roanoke-Harrisonburg, VA | View → |
| Mason | 4,100 | Mason | Texas | Austin-Waco, TX | View → |
| Mason | 14,000 | Havana | Illinois | Champaign-Peoria, IL | View → |
| Mason | 27,000 | Point Pleasant | West Virginia | Charleston-Bluefield, WV | View → |
| Mason | 17,400 | Maysville | Kentucky | Cincinnati-Dayton, OH | View → |
| Mason | 67,000 | Shelton | Washington | Seattle, WA | View → |
| Mason | 29,000 | Ludington | Michigan | Traverse City, MI | View → |
| Massac | 13,000 | Metropolis | Illinois | Paducah, KY | View → |
| Matagorda | 36,200 | Bay City | Texas | Houston, TX | View → |
| Mathews | 8,700 | Mathews | Virginia | Norfolk, VA-Salisbury, MD | View → |
| Maui | 168,000 | Kahului | Hawaii | Honolulu, HI | View → |
| Maury | 102,000 | Columbia | Tennessee | Nashville, TN | View → |
| Maverick | 58,500 | Eagle Pass | Texas | San Antonio-Corpus Christi, TX | View → |
| Mayes | 42,000 | Pryor Creek | Oklahoma | Tulsa, OK-Fort Smith, AR | View → |
| McClain | 42,000 | Purcell | Oklahoma | Oklahoma City, OK | View → |
| McCone | 1,600 | Circle | Montana | Bismarck, ND | View → |
| McCook | 5,600 | Salem | South Dakota | Sioux Falls-Rapid City, SD | View → |
| McCormick | 9,900 | McCormick | South Carolina | Savannah-Augusta, GA | View → |
| McCracken | 65,000 | Paducah | Kentucky | Paducah, KY | View → |
| McCreary | 17,000 | Whitley City | Kentucky | Knoxville-Chattanooga, TN | View → |
| McCulloch | 7,800 | Brady | Texas | Austin-Waco, TX | View → |
| McCurtain | 33,000 | Idabel | Oklahoma | Shreveport, LA | View → |
| McDonald | 23,000 | Pineville | Missouri | Springfield, MO | View → |
| McDonough | 29,000 | Macomb | Illinois | Champaign-Peoria, IL | View → |
| McDowell | 18,000 | Welch | West Virginia | Charleston-Bluefield, WV | View → |
| McDowell | 45,000 | Marion | North Carolina | Greenville, SC-Asheville, NC | View → |
| McDuffie | 21,500 | Thomson | Georgia | Savannah-Augusta, GA | View → |
| McHenry | 5,800 | Towner | North Dakota | Bismarck, ND | View → |
| McHenry | 320,000 | Crystal Lake | Illinois | Chicago, IL | View → |
| Mcintosh | 20,000 | Eufaula | Oklahoma | Tulsa, OK-Fort Smith, AR | View → |
| McIntosh | 2,700 | Ashley | North Dakota | Bismarck, ND | View → |
| McIntosh | 15,000 | Darien | Georgia | Savannah-Augusta, GA | View → |
| McKean | 41,000 | Bradford | Pennsylvania | Buffalo-Rochester-Syracuse, NY | View → |
| McKenzie | 15,000 | Watford City | North Dakota | Bismarck, ND | View → |
| McKinley | 72,000 | Gallup | New Mexico | Albuquerque, NM | View → |
| McLean | 10,000 | Garrison | North Dakota | Bismarck, ND | View → |
| McLean | 170,000 | Bloomington | Illinois | Champaign-Peoria, IL | View → |
| McLean | 9,500 | Calhoun | Kentucky | Louisville, KY-Evansville, IN | View → |
| McLennan | 265,000 | Waco | Texas | Austin-Waco, TX | View → |
