| NMNextech Materials LTD | Lewis Center | OH | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| NTNoble Tool LLC | Dayton | OH | Fabricated Metal Product Manufacturing332710 | 1-19 | ◐ LIKELY ACTIVE |
| NINordec Inc | Stow | OH | Printing and Related Support Activities323113 | 20-99 | ◐ LIKELY ACTIVE |
| NMNorlake Manufacturing CO | Elyria | OH | Computer and Electronic Product Manufacturing334416 | 20-99 | ◐ LIKELY ACTIVE |
| NCNorth Coast Container CORP | Cleveland | OH | Fabricated Metal Product Manufacturing332439 | — | ◐ LIKELY ACTIVE |
| NONorthwestern Ohio Foam Packaging | Wauseon | OH | Plastics and Rubber Products Manufacturing326140 | 20-99 | ◐ LIKELY ACTIVE |
| NTNorthwestern Tools Inc. | Dayton | OH | Machinery Manufacturing333514 | 20-99 | ◐ LIKELY ACTIVE |
| NINorthwood Industries, Inc. | Perrysburg | OH | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| NCNOSHOK Corporate HQ | Berea | OH | Computer and Electronic Product Manufacturing334513 | 20-99 | ◐ LIKELY ACTIVE |
| NANovelis Alr Recycling of Ohio LLC | Uhrichsville | OH | Primary Metal Manufacturing331314 | — | ◐ LIKELY ACTIVE |
| NANovelis Alr Rolled Products, INC. | Ashville | OH | Fabricated Metal Product Manufacturing332311 | — | ◐ LIKELY ACTIVE |
| NANpa Automotive Finishes & Films | Cleveland | OH | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
| NCNSI Crankshaft | Fostoria | OH | Transportation Equipment Manufacturing336310 | 20-99 | ◐ LIKELY ACTIVE |
| NSNucor Steel Marion, INC. (0351010017) | Marion | OH | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| ODOhio Drill and Tool Company | Homeworth | OH | Machinery Manufacturing333515 | 20-99 | ◐ LIKELY ACTIVE |
| OMOhio Moulding | Wickliffe | OH | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| OIOlymco INC | Canton | OH | Fabricated Metal Product Manufacturing332813 | — | ◐ LIKELY ACTIVE |
| OMOntario Mechanical LLC | Mansfield | OH | Fabricated Metal Product Manufacturing332322 | 20-99 | ◐ LIKELY ACTIVE |
Ordnance Technology Service, INC. | Concord Township | OH | Fabricated Metal Product Manufacturing332993 | 20-99 | ◐ LIKELY ACTIVE |
| OTOrganic Technologies | Coshocton | OH | Food Manufacturing311710 | — | ◐ LIKELY ACTIVE |
| OPOttawa Products | Curtice | OH | Fabricated Metal Product Manufacturing332618 | 20-99 | ◐ LIKELY ACTIVE |
| OBOwens Brockway Glass Containers - Plant No 12 | Zanesville | OH | Nonmetallic Mineral Product Manufacturing327212 | — | ◐ LIKELY ACTIVE |
| OCOwens Corning (0142010065) | Mount Vernon | OH | Nonmetallic Mineral Product Manufacturing327993 | — | ◐ LIKELY ACTIVE |
| OCOwens Corning Insulating Systems, LLC | Newark | OH | Nonmetallic Mineral Product Manufacturing327993 | — | ◐ LIKELY ACTIVE |
| PMPacific Manufacturing Ohio INC | Fairfield | OH | Transportation Equipment Manufacturing336211 | 500+ | ◐ LIKELY ACTIVE |
| PMPalmer Manufacturing & Supply, Inc. | Springfield | OH | Machinery Manufacturing333249 | 20-99 | ◐ LIKELY ACTIVE |
| PHParker Hannifin Hvd | Elyria | OH | Fabricated Metal Product Manufacturing332911 | — | ◐ LIKELY ACTIVE |
| PHParker Hannifin Lewisburg Plant | Lewisburg | OH | Fabricated Metal Product Manufacturing332919 | — | ◐ LIKELY ACTIVE |
| PWPengg Wmc LLC | Bedford Heights | OH | Primary Metal Manufacturing331222 | — | ◐ LIKELY ACTIVE |
| PFPentair Flow Technologies, LLC - Ashland Pump Plant (0303010175) | Ashland | OH | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| PHPerformance Health | Akron | OH | Chemical Manufacturing325212 | — | ◐ LIKELY ACTIVE |
| PPermco | Streetsboro | OH | Machinery Manufacturing333911 | 100-499 | ◐ LIKELY ACTIVE |
| PCPeter Cremer North America - South Terminal | Cincinnati | OH | Chemical Manufacturing325199 | 100-499 | ◐ LIKELY ACTIVE |
| PPPet Processors, L.l.c. (0243000165) | Painesville | OH | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| PMPhd Manufacturing INC | Columbiana, Ohio | OH | Fabricated Metal Product Manufacturing332999 | 100-499 | ◐ LIKELY ACTIVE |
| PNPilkington NA INC -rossford Facility | Rossford | OH | Nonmetallic Mineral Product Manufacturing327211 | — | ◐ LIKELY ACTIVE |
| PTPioneer Transformer CO | Pioneer | OH | Electrical Equipment, Appliance & Component Manufacturing335311 | 20-99 | ◐ LIKELY ACTIVE |
| PCPlas-tec CORP | Edon | OH | Plastics and Rubber Products Manufacturing326191 | 20-99 | ◐ LIKELY ACTIVE |
| PRPlastics R Unique INC | Wadsworth | OH | Plastics and Rubber Products Manufacturing326130 | 20-99 | ◐ LIKELY ACTIVE |
| PPPleasant Precision Inc | Kenton | OH | Machinery Manufacturing333514 | 20-99 | ◐ LIKELY ACTIVE |
| PVPleasant Valley Teardrop Trailers, LLC | Sugarcreek | OH | Transportation Equipment Manufacturing336214 | 100-499 | ◐ LIKELY ACTIVE |
| PCPolynt Composites Usa, INC (0322020129) | Sandusky | OH | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
| PAPowers and Sons | Montpelier | OH | Transportation Equipment Manufacturing336330 | 100-499 | ◐ LIKELY ACTIVE |
| PIPpg Industries | Circleville | OH | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| PIPpg Industries, Barberton | Barberton | OH | Chemical Manufacturing325131 | — | ◐ LIKELY ACTIVE |
| PCPrecision Castparts CORP - Airfoils LLC | Painesville | OH | Machinery Manufacturing333611 | — | ◐ LIKELY ACTIVE |
| PEPrecision Entry | Sugarcreek | OH | Fabricated Metal Product Manufacturing332321 | — | ◐ LIKELY ACTIVE |
| PRPrecision Reflex INC | New Bremen | OH | Fabricated Metal Product Manufacturing332994 | 1-19 | ◐ LIKELY ACTIVE |
| PWPrecision Wood Products Inc | Camden | OH | Furniture and Related Product Manufacturing337110 | 20-99 | ◐ LIKELY ACTIVE |
| POPremier Oem | Cuyahoga Falls | OH | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |