| State Name | County Name | City |
|---|---|---|
| California | Los Angeles | Marina del Rey |
| Michigan | St. Clair | Marine City |
| Alabama | Perry | Marion |
| Arkansas | Crittenden | Marion |
| Iowa | Linn | Marion |
| Illinois | Williamson | Marion |
| Indiana | Grant | Marion |
| Kentucky | Crittenden | Marion |
| Massachusetts | Plymouth | Marion |
| North Carolina | McDowell | Marion |
| New York | Wayne | Marion |
| Ohio | Marion | Marion |
| South Carolina | Marion | Marion |
| Virginia | Smyth | Marion |
| Mississippi | Quitman | Marks |
| Louisiana | Avoyelles | Marksville |
| New Jersey | Monmouth | Marlboro |
| New York | Ulster | Marlboro |
| Maryland | Prince George's | Marlboro Meadows |
| Maryland | Prince George's | Marlboro Village |
| Connecticut | Hartford | Marlborough |
| Massachusetts | Middlesex | Marlborough |
| New York | Ulster | Marlborough |
| Pennsylvania | Montgomery | Marlborough |
| Texas | Falls | Marlin |
| Oklahoma | Stephens | Marlow |
| Maryland | Prince George's | Marlow Heights |
| Maryland | Prince George's | Marlton |
| North Carolina | Wayne | Mar-Mac |
| Pennsylvania | Delaware | Marple |
| Michigan | Marquette | Marquette |
| Louisiana | Jefferson | Marrero |
| Illinois | LaSalle | Marseilles |
| Illinois | Clark | Marshall |
| Michigan | Calhoun | Marshall |
| Minnesota | Lyon | Marshall |
| Missouri | Saline | Marshall |
| Pennsylvania | Allegheny | Marshall |
| Texas | Harrison | Marshall |
| Wisconsin | Dane | Marshall |
| Iowa | Marshall | Marshalltown |
| Massachusetts | Plymouth | Marshfield |
| Missouri | Webster | Marshfield |
| Wisconsin | Wood | Marshfield |
| North Carolina | Union | Marshville |
| Washington | Snohomish | Martha Lake |
| Pennsylvania | Lancaster | Martic |
| Tennessee | Weakley | Martin |
| California | Contra Costa | Martinez |
| Georgia | Columbia | Martinez |
| Ohio | Belmont | Martins Ferry |
| West Virginia | Berkeley | Martinsburg |
| Indiana | Morgan | Martinsville |
| New Jersey | Somerset | Martinsville |
| Virginia | Martinsville | Martinsville |
| Florida | Okaloosa | Mary Esther |
| Maryland | Anne Arundel | Maryland City |
| Missouri | St. Louis | Maryland Heights |
| California | Yuba | Marysville |
| Kansas | Marshall | Marysville |
| Michigan | St. Clair | Marysville |
| Ohio | Union | Marysville |
| Washington | Snohomish | Marysville |
| Illinois | Madison | Maryville |
| Missouri | Nodaway | Maryville |
| Tennessee | Blount | Maryville |
| Florida | Lake | Mascotte |
| Illinois | St. Clair | Mascoutah |
| Massachusetts | Barnstable | Mashpee |
| Michigan | Ingham | Mason |
| Ohio | Warren | Mason |
| Iowa | Cerro Gordo | Mason City |
| Pennsylvania | Fayette | Masontown |
| Kentucky | McCracken | Massac |
| Virginia | Rockingham | Massanetta Springs |
| New York | Nassau | Massapequa |
| New York | Nassau | Massapequa Park |
| New York | St. Lawrence | Massena |
| Ohio | Stark | Massillon |
| New York | Suffolk | Mastic |
| New York | Suffolk | Mastic Beach |
| New Jersey | Monmouth | Matawan |
| California | Sacramento | Mather |
| Texas | San Patricio | Mathis |
| Massachusetts | Plymouth | Mattapoisett |
| Massachusetts | Plymouth | Mattapoisett Center |
| Washington | Grant | Mattawa |
| Illinois | Cook | Matteson |
| North Carolina | Mecklenburg | Matthews |
| New York | Suffolk | Mattituck |
| Illinois | Coles | Mattoon |
| New York | Onondaga | Mattydale |
| South Carolina | Greenville | Mauldin |
| Ohio | Lucas | Maumee |
| Arkansas | Pulaski | Maumelle |
| New Jersey | Cumberland | Maurice River |
| Wisconsin | Marinette | Marinette |
| Illinois | Cook | Markham |
| New Jersey | Burlington | Marlton |
| North Carolina | Union | Marvin |
