MDplates.com
MDplates is a joint venture between Jordan Irazabal of Delaware, and Scott Zillmer of Maryland. The goal is to find and photograph every special organization plate that Maryland offers.
Letter: M
| Type | High | Full Name |
| MA | Moroccan American Society | |
| MAA | 0060 | Maryland Arborist Association |
| MAR | Ferrari Club of America, Mid-Atlantic Region | |
| MAS | Muslim American Society | |
| MB | 0420 | Mercedes Benz Club of America, Inc. |
| MC | 188 | Montgomery County Fire and Rescue Service |
| MC | 0947 | Montgomery County Police |
| MC | Marietta College Alumni Association | |
| MCA | 0057 | Morehouse Alumni Association |
| MCC | Maryland Chevelle Club | |
| MCD | McDonogh Alumni Association | |
| MCM | Mustang Club of Maryland | |
| MCP | 0322 | Montgomery County Police Association, Inc. |
| MD | Maryland Democratic Party | |
| MD | University of Maryland Medical System | |
| MDM | 0365 | Marking the Millennium |
| MDZ | 0237 | Maryland Zoo in Baltimore |
| ME | Marriage Encounter | |
| MEBA | 031 | Marine Engineers Beneficial Association |
| MES | 4149 | Maryland's Eastern Shore |
| MES | Mid-Shore Community Foundation | |
| MFA | Maryland Federation of Art | |
| MFB | Maryland Farm Bureau, Inc. | |
| MFC | 0008 | Community Fire Company of Millington |
| MFD | 0010 | Mechanicsville Volunteer Fire Department |
| MGN | 0081 | Maryland Gridiron Network |
| MGS | Maryland Geocaching Society | |
| MH | Maryland Horsemen League | |
| MH | Medal of Honor | |
| MH | Medal of Honor (motorcycle) | |
| MHB | 0119 | Maryland Horse Breeders Assoc. |
| MHS | Mercy High School | |
| MHU | National Postal Mail Handlers Union | |
| MI | Charles County Mobil Intensive Care Unit | |
| Military-Related Plates | ||
| MIL | 1014 | United States Air Force |
| MIL | United States Air Force (motorcycle) | |
| MIL | 2354 | United States Army - Female Veteran |
| MIL | United States Army (motorcycle) | |
| MIL | 4046 | United States Coast Guard |
| MIL | United States Coast Guard (motorcycle) | |
| MIL | 0108 | United States Marine Corps |
| MIL | United States Marine Corps (motorcycle) | |
| MIL | United States Navy | |
| MIL | United States Navy (motorcycle) | |
| MIL | 6348 | Veteran U.S. Air Force |
| MIL | Veteran U.S. Air Force (motorcycle) | |
| MIL | 9591 | Veteran U.S. Army |
| MIL | Veteran U.S. Army (motorcycle) | |
| MIL | 9140 | Veteran U.S. Coast Guard |
| MIL | Veteran U.S. Coast Guard (motorcycle) | |
| MIL | 5371 | Veteran U.S. Marine Corps |
| MIL | Veteran U.S. Marine Corps (motorcycle) | |
| MIL | 8492 | Veteran U.S. Navy |
| MIL | Veteran U.S. Navy (motorcycle) | |
| MIT | MIT Club of Washington | |
| ML | 0827 | Marine Corps League |
| MLA | Maryland Locksmith Association | |
| MLH | 0056 | Mace's Lane High School Alumni Association |
| MM | Mid Maryland Ford Club | |
| MM | The Glen L Martin Aviation Museum | |
| MMG | University of Maryland - Maryland Cooperative Extension | |
| MMG | 0169 | University of Maryland Master Gardeners |
| MML | Maryland Municipal League | |
| MMP | International Organization of Masters, Mates and Pilots | |
| MN | National Association of Retired Federal Employees | |
| MOC | Military Order of the Cootie and Auxiliary | |
| MOH | 0039 | Miami University Alumni Assoc. |
| MOS | Maryland Ornithological Society | |
| MPC | Maryland Press Club | |
| MPT | 0020 | Maryland Public Television |
| MR | 0028 | US Marine Corps Reserve |
| MRO | ABATE of Maryland, Inc. | |
| MRO | ABATE of Maryland, Inc. (motorcycle) | |
| MRS | Mechanicsville Volunteer Rescue Squad, Inc. | |
| MRU | Marshall University Alumni Association | |
| MS | Baltimore Area Alumni Association, Inc. of Alpha Phi Omega Fraternity | |
| MSA | 0206 | Maryland Society of Accountants, Inc. |
| MSB | Maple Springs Baptist Church | |
| MSC | 0039 | Maryland Science Center |
| MSF | Maryland State Fair | |
| MSI | 0061 | Maryland Swimming, Inc. |
| MSJ | 0377 | Mount St. Joseph Alumni |
| MSL | 2365 | ??? |
| MSM | 0026 | Mount St. Mary's University |
| MSP | 1355 | Maryland State Police Alumni Association |
| MSS | Maryland Society of Surveyors, Inc | |
| MST | 0079 | Michigan State University |
| MSU | 0099 | Morgan State University (old style) |
| MSU | 0497 | Morgan State University National Alumni Association, Inc. |
| MT | Middletown Volunteer Fire Company | |
| MTA | Maryland Troopers Association | |
| MTN | The Greater Cumberland Committee | |
| MU | 0004 | St. Mary's County ALS Unit |
| MUO | Miami University Alumni Association | |
| MV | 0044 | Mardela Springs Volunteer Fire Company |
| MVD | Marion Fire Department | |
| MW | 0073 | Maryland State Wrestling Association |
| MWA | 0223 | Maryland Watermen's Association, Inc. |
| MWPH | 001 | Mount Washington Pediatric Hospital |
| MWR | 0066 | Maryland Westie Rescue, Inc. |
| MX | Mid - Atlantic Motor X | |
| MY | Myersville Volunteer Fire Department | |
| MYC | 0138 | Miles River Yacht Club |
