| MPManufacturing Plant MMDC | Byhalia | MS | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| MCMarathon Cheese Booneville | Booneville | MS | Food Manufacturing311513 | 100-499 | ◐ LIKELY ACTIVE |
| MWMarcella's Winery | Columbus | MS | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| MNMarelli NA | Canton | MS | Transportation Equipment Manufacturing336320 | 100-499 | ◐ LIKELY ACTIVE |
| MIMasonite International | Laurel | MS | Wood Product Manufacturing321219 | 100-499 | ◐ LIKELY ACTIVE |
| MWMatthew W Davis | Ocean Springs | MS | Computer and Electronic Product Manufacturing334310 | — | ◐ LIKELY ACTIVE |
| MMcComb | Mccomb | MS | Petroleum and Coal Products Manufacturing324121 | 20-99 | ◐ LIKELY ACTIVE |
| MLMcComb Lumber | Magnolia | MS | Wood Product Manufacturing321113 | 100-499 | ◐ LIKELY ACTIVE |
| MIMcGregor Industrial Steel Fabrication, Inc. | Oxford | MS | Fabricated Metal Product Manufacturing332313 | 1-19 | ◐ LIKELY ACTIVE |
| MSMckesson Specialty Distribution LLC | Olive Branch | MS | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| MGMEC - Greenville | Greenville | MS | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| MMeridian | Meridian | MS | Machinery Manufacturing333998 | 20-99 | ◐ LIKELY ACTIVE |
| MMMeridian Ms Bakery | Meridian | MS | Food Manufacturing311812 | 100-499 | ◐ LIKELY ACTIVE |
| MOMeridian One Store Solutions | NAS Meridian | MS | Printing and Related Support Activities323111 | 1-19 | ◐ LIKELY ACTIVE |
| MWMeridian Warehouse | NAS Meridian | MS | Printing and Related Support Activities323111 | 1-19 | ◐ LIKELY ACTIVE |
| MSMetal Solutions - Vicksburg | Vicksburg | MS | Fabricated Metal Product Manufacturing332311 | 20-99 | ◐ LIKELY ACTIVE |
| MMMid-south Metal Buildings LLC | Hernando | MS | Fabricated Metal Product Manufacturing332322 | — | ◐ LIKELY ACTIVE |
| MMMisa Metal Processing Forest, Mississippi | Forest | MS | Primary Metal Manufacturing331221 | 1-19 | ◐ LIKELY ACTIVE |
| MRMississippi Reman | Corinth | MS | Machinery Manufacturing333618 | 500+ | ◐ LIKELY ACTIVE |
| MSMississippi State University Meat Laboratory | Mississippi State | MS | Food Manufacturing311611 | — | ◐ LIKELY ACTIVE |
| MTMississippi Tank Company | Hattiesburg | MS | Machinery Manufacturing333992 | 100-499 | ◐ LIKELY ACTIVE |
Modine Manufacturing Company - Grenada OEM | Grenada | MS | Machinery Manufacturing333415 | 500+ | ◐ LIKELY ACTIVE |
Motion Systems Olive Branch | Olive Branch | MS | Transportation Equipment Manufacturing336350 | 100-499 | ◐ LIKELY ACTIVE |
| MVMount Vernon Mills Columbus | Columbus | MS | Textile Mills313210 | 20-99 | ◐ LIKELY ACTIVE |
| MHMS006 Hattiesburg | Hattiesburg | MS | Paper Manufacturing322291 | 100-499 | ◐ LIKELY ACTIVE |
| MBMs02-mem-olive Branch | Olive Branch | MS | Miscellaneous Manufacturing339112 | 20-99 | ◐ LIKELY ACTIVE |
| MMMS150 Monticello, MS Paper | Monticello | MS | Paper Manufacturing322130 | 500+ | ◐ LIKELY ACTIVE |
| MLMS163 Leaf River Cellulose | New Augusta | MS | Paper Manufacturing322110 | 100-499 | ◐ LIKELY ACTIVE |
| MTMS192 Taylorsville Studmill | Taylorsville | MS | Wood Product Manufacturing321113 | 500+ | ◐ LIKELY ACTIVE |
| MWMuddy Waters Distillery LLC | Biloxi | MS | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| MCMueller Copper Tube Company | Fulton | MS | Primary Metal Manufacturing331420 | 500+ | ◐ LIKELY ACTIVE |
| MSMueller Supply Company INC | Brookhaven | MS | Fabricated Metal Product Manufacturing332311 | 20-99 | ◐ LIKELY ACTIVE |
| MCMuller Copper Line Sets | Fulton | MS | Primary Metal Manufacturing331410 | 100-499 | ◐ LIKELY ACTIVE |
| NMNammo MAC, LLC | Bay Saint Louis | MS | Fabricated Metal Product Manufacturing332992 | 20-99 | ◐ LIKELY ACTIVE |
| NCN C Enterprises, INC | Hazlehurst | MS | Fabricated Metal Product Manufacturing332510 | — | ◐ LIKELY ACTIVE |
| NLNecessary LLC | Foxworth | MS | Beverage and Tobacco Product Manufacturing312112 | — | ◐ LIKELY ACTIVE |
| NPNefab Packaging South East LLC | Olive Branch, MS | MS | Wood Product Manufacturing321920 | 100-499 | ◐ LIKELY ACTIVE |
| NFNeshoba Feed Mill (MLO) | Union | MS | Food Manufacturing311119 | 20-99 | ◐ LIKELY ACTIVE |
| NANew Albany Dunn Utility Products LLC | New Albany | MS | Nonmetallic Mineral Product Manufacturing327332 | 20-99 | ◐ LIKELY ACTIVE |
| NWNew Way Trucks - Industrial | Booneville | MS | Transportation Equipment Manufacturing336211 | 20-99 | ◐ LIKELY ACTIVE |
| NNgas-r486 | Moss Point | MS | Transportation Equipment Manufacturing336411 | 100-499 | ◐ LIKELY ACTIVE |
| NPNGF Processing, LLC | Petal | MS | Food Manufacturing311611 | — | ◐ LIKELY ACTIVE |
| NNgms-r468 | Ocean Springs | MS | Computer and Electronic Product Manufacturing334511 | 20-99 | ◐ LIKELY ACTIVE |
| NBNiagara Bottling, LLC - Mississippi | Byhalia | MS | Beverage and Tobacco Product Manufacturing312112 | 20-99 | ◐ LIKELY ACTIVE |
| NBNothing Bundt Cakes - Gulfport | Gulfport | MS | Food Manufacturing311811 | 20-99 | ◐ LIKELY ACTIVE |
| NBNothing Bundt Cakes - Hattiesburg | Hattiesburg | MS | Food Manufacturing311811 | 1-19 | ◐ LIKELY ACTIVE |
| NBNothing Bundt Cakes - Jackson-Flowood | Flowood | MS | Food Manufacturing311811 | 20-99 | ◐ LIKELY ACTIVE |
| NBNothing Bundt Cakes - Madison | Madison | MS | Food Manufacturing311811 | 20-99 | ◐ LIKELY ACTIVE |
| NMNoTrax Moselle | Moselle | MS | Plastics and Rubber Products Manufacturing326299 | 100-499 | ◐ LIKELY ACTIVE |
| NRNucor Rebar Fabrication Southcentral LLC - Jackson Mississippi | Flowood | MS | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |