| MSMill St. Distillery, LLC | Utica, OH | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| MSMill Street Distillery | Utica, OH | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| MIMillwood, Inc. Columbus | Columbus, OH | Wood Product Manufacturing321920 | 100–499 | ◐ LIKELY ACTIVE |
| MFMirabelle Farm and Vineyard | Ashville, OH | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| MFMoser's Farm Market and Barn | Powell, OH | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| MOM & O Spirits | Ashville, OH | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| MDMotherwell Distilling CO. | Logan, OH | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
Motion Systems Marysville | Marysville, OH | Machinery Manufacturing333996 | 100–499 | ◐ LIKELY ACTIVE |
| MIMPW Industrial Water Services, Inc. - Water Newark | Newark, OH | Miscellaneous Manufacturing339999 | 20–99 | ◐ LIKELY ACTIVE |
| MMMTNA - Marysville | Marysville, OH | Plastics and Rubber Products Manufacturing326199 | 100–499 | ◐ LIKELY ACTIVE |
| MPMuller Pipe Organ CO | Croton, OH | Miscellaneous Manufacturing339992 | — | ◐ LIKELY ACTIVE |
| NMNA Mfg Dearborn | Columbus, OH | Machinery Manufacturing333415 | 20–99 | ◐ LIKELY ACTIVE |
| NMNA Mfg Delaware | Delaware, OH | Electrical Equipment, Appliance & Component Manufacturing335999 | 100–499 | ◐ LIKELY ACTIVE |
| NRNational Road Winery | Thornville, OH | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| NBNavidea Biopharmaceuticals, INC. | Columbus, OH | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| NCNcs Corporation | Columbus, OH | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| NLNecotech LLC | Delaware, OH | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| NNewark | Hebron, OH | Printing and Related Support Activities323111 | 100–499 | ◐ LIKELY ACTIVE |
| NONewark, Oh | Newark, OH | Paper Manufacturing322211 | 100–499 | ◐ LIKELY ACTIVE |
| NTNewark Trucking | Newark, OH | Transportation Equipment Manufacturing336999 | 1–19 | ◐ LIKELY ACTIVE |
| NDNew Day Farms, LLC | Raymond, OH | Food Manufacturing311999 | — | ◐ LIKELY ACTIVE |
| NDNew Day Farms, LLC | Croton, OH | Food Manufacturing311999 | — | ◐ LIKELY ACTIVE |
| NDNew Day Farms, LLC - Farm 3 | West Mansfield, OH | Food Manufacturing311999 | — | ◐ LIKELY ACTIVE |
| NHNew Horizons Bakery Charter Street | Columbus, OH | Food Manufacturing311812 | 20–99 | ◐ LIKELY ACTIVE |
| NHNew Horizons Food Solutions, LLC. | Columbus, OH | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| NSNext Step Prosthetics of Ohio LLC | Columbus, OH | Miscellaneous Manufacturing339113 | — | ◐ LIKELY ACTIVE |
| NANifco America Corporation | Canal Winchester, OH | Plastics and Rubber Products Manufacturing326199 | 100–499 | ◐ LIKELY ACTIVE |
| NANifco America Corporation Oh Warehouse | Canal Winchester, OH | Plastics and Rubber Products Manufacturing326199 | 100–499 | ◐ LIKELY ACTIVE |
| NCNoble Cut Distillery | Gahanna, OH | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| NANorth America Pataskala | Pataskala, OH | Wood Product Manufacturing321911 | 100–499 | ◐ LIKELY ACTIVE |
| NHNorth High Brewing | Columbus, OH | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| NMNorth Market Bakery | Upper Arlington, OH | Food Manufacturing311811 | 20–99 | ◐ LIKELY ACTIVE |
| NANovelis Ashville OH | Ashville, OH | Fabricated Metal Product Manufacturing332812 | 100–499 | ◐ LIKELY ACTIVE |
| OBOak & Brazen | Powell, OH | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| OCOEM Columbus | Grove City, OH | Nonmetallic Mineral Product Manufacturing327993 | 20–99 | ◐ LIKELY ACTIVE |
| OOh | Dublin, OH | Computer and Electronic Product Manufacturing334511 | 1–19 | ◐ LIKELY ACTIVE |
| OCOH067 Circleville Container | Circleville, OH | Paper Manufacturing322211 | 100–499 | ◐ LIKELY ACTIVE |
| OAOh08 Ametek Solidstate Controls | Columbus, OH | Electrical Equipment, Appliance & Component Manufacturing335999 | 100–499 | ◐ LIKELY ACTIVE |
| OTOhashi Technica USA Manufacturing Inc | Sunbury, OH | Transportation Equipment Manufacturing336390 | 20–99 | ◐ LIKELY ACTIVE |
| OCOH - Columbus - 950 Stelzer Rd - The American Bottling Company | Columbus, OH | Beverage and Tobacco Product Manufacturing312111 | 100–499 | ◐ LIKELY ACTIVE |
| OOOhio Office | Columbus, OH | Transportation Equipment Manufacturing336320 | 20–99 | ◐ LIKELY ACTIVE |
| OSOhio Steel Industries Inc - OSI Plastics Delaware | Delaware, OH | Plastics and Rubber Products Manufacturing326122 | 20–99 | ◐ LIKELY ACTIVE |
| OOlan | Canal Winchester, OH | Machinery Manufacturing333249 | 1–19 | ◐ LIKELY ACTIVE |
| OCOMF Columbus, Inc | Columbus, OH | Furniture and Related Product Manufacturing337910 | 20–99 | ◐ LIKELY ACTIVE |
| OCOnevision CORP | Westerville, OH | Computer and Electronic Product Manufacturing334513 | — | ◐ LIKELY ACTIVE |
| ONOssur North America Inc. Dublin | Dublin, OH | Miscellaneous Manufacturing339113 | 1–19 | ◐ LIKELY ACTIVE |
| OBOuterbelt Brewing LLC | Carroll, OH | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| OCOwens Corning | Newark, OH | Nonmetallic Mineral Product Manufacturing327993 | 500+ | ◐ LIKELY ACTIVE |
| PPPanacea Products - Joyce Avenue | Columbus, OH | Miscellaneous Manufacturing339999 | 20–99 | ◐ LIKELY ACTIVE |
| PLPantronix LLC | Columbus, OH | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |