| Manufacturing Engineering Construction And Automotive | Academic & Science |
| Modified Early College Academy | Academic & Science |
| Mechanical Electrical Civil Architectural | Academic & Science |
| Mobile Electronics Competition Association | Academic & Science |
| Mechanical Electrical Civil Architecture | Academic & Science |
| Manufacturers Of Emission Controls Association | Business |
| Multi Employer Collective Agreement | Business |
| The Manufacturers Of Emissions Controls Association | Business |
| Manyu Elements And Cultural Association | Business |
| Mortgage Extension Consolidation Agreement | Business |
| Massachusetts Electrical Contractors Association | Business |
| Muslim Educational and Cultural Association | Community |
| MN Erosion Control Association | Community |
| Muslims Establishing Communities in America | Community |
| Most Entrepreneurial Community in America | Community |
| Michigan Electric Cooperative Association | Community |
| Middle East Center for the Arts | Community |
| Maritime Electronic Commerce Association | Computing |
| Malaysia E-Commerce Association | Computing |
| Major E-Commerce Association | Computing |
| Macedonian E-Commerce Association | Computing |
| Multipath E Cube Algorithm | General |
| May Everyone Connect Always | General |
| Middle East Central Asia | General |
| Microscopy Electrochemistry and Conductivity Analyzer | General |
| Milwaukee Emergency Center For Animals | General |
| Mission Executive Crew Assistant | General |
| MODUM Experimental Control Algorithms | General |
| Materials Education Center for Automobile | General |
| Mongolian Eco Cars Association | General |
| The Middle East Childrens Alliance | Governmental |
| Main Engine Controller Assembly | Governmental |
| Metropolitan Entertainment Convention Authority | Governmental |
| Monitor Evaluate Control and Act | Governmental |
| Medical Electronic Customer Assistance | Medical |
