| LILinde INC. | Baltimore | MD | Chemical Manufacturing325120 | — | ◐ LIKELY ACTIVE |
| LCLindstrom Corporation | Hyattsville | MD | Fabricated Metal Product Manufacturing332321 | 20-99 | ◐ LIKELY ACTIVE |
| LPLuke Paper CO | Luke | MD | Paper Manufacturing322110 | — | ◐ LIKELY ACTIVE |
| LBLyon Bakery | Hyatsville | MD | Food Manufacturing311812 | 100-499 | ◐ LIKELY ACTIVE |
| MBMa Bioservices | Rockville | MD | Chemical Manufacturing325414 | — | ◐ LIKELY ACTIVE |
| MCMachado Construction Company, INC. | Halethorpe | MD | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| MIMacroGenics, Inc._CorpHQ | Rockville | MD | Chemical Manufacturing325412 | 100-499 | ◐ LIKELY ACTIVE |
| MGMagBio Genomics, Inc. | Gaithersburg | MD | Miscellaneous Manufacturing339112 | — | ◐ LIKELY ACTIVE |
| MBMaiden Biosciences, INC | Gaithersburg | MD | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| MPManger Packing Corp. | Baltimore | MD | Food Manufacturing311611 | — | ◐ LIKELY ACTIVE |
| MAMaryland Air National Guard | Baltimore | MD | Transportation Equipment Manufacturing336411 | — | ◐ LIKELY ACTIVE |
| MMMaryland Meadworks, LLC | Hyattsville | MD | Beverage and Tobacco Product Manufacturing312130 | 1-19 | ◐ LIKELY ACTIVE |
| MPMaryland Portable Concrete Elkton | Elkton | MD | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| MPMaryland Precision Spring CO | Baltimore | MD | Fabricated Metal Product Manufacturing332116 | 20-99 | ◐ LIKELY ACTIVE |
| MSMd Sales Innovations, LLC | Fort Washington | MD | Miscellaneous Manufacturing339112 | 1-19 | ◐ LIKELY ACTIVE |
| MIMeade Inc | Millersville | MD | Printing and Related Support Activities323113 | 1-19 | ◐ LIKELY ACTIVE |
| MIMedcura Inc. | Riverdale Park | MD | Miscellaneous Manufacturing339112 | 20-99 | ◐ LIKELY ACTIVE |
| MLMedimmune LLC | Gaithersburg | MD | Chemical Manufacturing325414 | — | ◐ LIKELY ACTIVE |
| MMMeeker's Meadery | Frederick | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| MSMeso Scale Diagnostics, LLC | Rockville | MD | Chemical Manufacturing325413 | — | ◐ LIKELY ACTIVE |
| MRMiddle River Aerostructure Systems | Middle River | MD | Transportation Equipment Manufacturing336413 | — | ◐ LIKELY ACTIVE |
| MAMiller Asphalt - Legore | Keymar | MD | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| MCMillStone Cellars | Monkton | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
M Luis Products LLC | Silver Spring | MD | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
M. Luis Products, LLC | Rockville | MD | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| MVMount Vernon Printing | Laurel | MD | Printing and Related Support Activities323110 | 20-99 | ◐ LIKELY ACTIVE |
| NSNaval Support Activity Bethesda | Bethesda | MD | Miscellaneous Manufacturing339116 | — | ◐ LIKELY ACTIVE |
| NSNaval Support Facility, Indian Head | Indian Head | MD | Chemical Manufacturing325920 | — | ◐ LIKELY ACTIVE |
| NINegril, Inc. | Linthicum | MD | Food Manufacturing311612 | 1-19 | ◐ LIKELY ACTIVE |
| NGNorthrop Grumman Systems Corporation | Annapolis | MD | Computer and Electronic Product Manufacturing334290 | — | ◐ LIKELY ACTIVE |
| NGNorthrop Grumman Systems Corporation | Hanover | MD | Transportation Equipment Manufacturing336419 | — | ◐ LIKELY ACTIVE |
| NGNorthrop Grumman Systems Corporation | Sykesville | MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| OWOlney Winery | Beltsville | MD | Beverage and Tobacco Product Manufacturing312130 | 1-19 | ◐ LIKELY ACTIVE |
| OBOttenberg's Bakers | Eldersburg | MD | Food Manufacturing311812 | — | ◐ LIKELY ACTIVE |
| PPca | Timonium | MD | Printing and Related Support Activities323110 | 20-99 | ◐ LIKELY ACTIVE |
| PTPipe the Side Brewing Company, LLC | Hampstead | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| PIPooles Island Brewing Company, LLC | Middle River | MD | Beverage and Tobacco Product Manufacturing312130 | 1-19 | ◐ LIKELY ACTIVE |
| PCPowercon Corporation | Severn | MD | Nonmetallic Mineral Product Manufacturing327110 | 100-499 | ◐ LIKELY ACTIVE |
| PIPrecigen INC | Germantown | MD | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| PFPrime Foods INC | Hyattsville | MD | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| PSPVS Sackett-Waconia, Inc. BAL | Baltimore | MD | Machinery Manufacturing333922 | 20-99 | ◐ LIKELY ACTIVE |
| RERaff Embossing and Foilcraft, INC. | Hyattsville | MD | Paper Manufacturing322230 | 1-19 | ◐ LIKELY ACTIVE |
| RCReliable Contracting Company, INC. - Gambrills | Millersville | MD | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| RCReliable Contracting Company, INC. - Glen Burnie | Glen Burnie | MD | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| RTReliance Treated Wood Company INC | Federalsburg | MD | Wood Product Manufacturing321114 | — | ◐ LIKELY ACTIVE |
| RPRiverside Printing Services, INC | Hanover | MD | Printing and Related Support Activities323111 | 1-19 | ◐ LIKELY ACTIVE |
| RCR.l. Collinson, INC | Crofton | MD | Fabricated Metal Product Manufacturing332999 | 1-19 | ◐ LIKELY ACTIVE |
| RLRoy L. Hoffman & Sons, INC. | Hagerstown | MD | Food Manufacturing311612 | 20-99 | ◐ LIKELY ACTIVE |
| RHRunning Hare Vineyard | Prince Frederick | MD | Beverage and Tobacco Product Manufacturing312130 | 1-19 | ◐ LIKELY ACTIVE |
| RCRust-oleum Corporation - Hagerstown | Williamsport | MD | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |