| GAG. A. Wintzer & Son Company | Wapakoneta | OH | Food Manufacturing311613 | 100-499 | ◐ LIKELY ACTIVE |
| GEGeneral Extrusions INC | Youngstown | OH | Primary Metal Manufacturing331316 | 100-499 | ◐ LIKELY ACTIVE |
| GPGerbers Poultry INC | Apple Creek | OH | Food Manufacturing311615 | — | ◐ LIKELY ACTIVE |
| GMGerken Materials INC | Napoleon | OH | Petroleum and Coal Products Manufacturing324121 | 20-99 | ◐ LIKELY ACTIVE |
Gfs Chemicals INC | Columbus | OH | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| GSGkn Sinter Metals | Gallipolis | OH | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| GCGlass Coatings and Concepts * | Monroe | OH | Chemical Manufacturing325510 | 20-99 | ◐ LIKELY ACTIVE |
Global Gauge Corporation | Moraine | OH | Computer and Electronic Product Manufacturing334519 | — | ◐ LIKELY ACTIVE |
| GEGoldsmith & Eggleton, INC | Wadsworth | OH | Plastics and Rubber Products Manufacturing326299 | 20-99 | ◐ LIKELY ACTIVE |
| GRGrand River Rubber & Plastics Company | Ashtabula | OH | Plastics and Rubber Products Manufacturing326291 | 100-499 | ◐ LIKELY ACTIVE |
| GCGraphel Corporation | West Chester | OH | Machinery Manufacturing333999 | 20-99 | ◐ LIKELY ACTIVE |
| GMGreen Meadows Paper Company | Massillon | OH | Paper Manufacturing322130 | 20-99 | ◐ LIKELY ACTIVE |
| GSG & S Metal Products, INC. | Cleveland | OH | Fabricated Metal Product Manufacturing332000 | 100-499 | ◐ LIKELY ACTIVE |
| GLGtl Lumber | Ironton | OH | Wood Product Manufacturing321113 | 20-99 | ◐ LIKELY ACTIVE |
| GFGuaranteed Finishing Unlimited INC | Cleveland | OH | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| HPHale Performance Coatings | Toledo | OH | Fabricated Metal Product Manufacturing332812 | 20-99 | ◐ LIKELY ACTIVE |
| HCHampshire CO. | Piqua | OH | Furniture and Related Product Manufacturing337110 | 20-99 | ◐ LIKELY ACTIVE |
| HCHarbor Castings, INC. | Cuyahoga Falls | OH | Primary Metal Manufacturing331512 | 100-499 | ◐ LIKELY ACTIVE |
Hartzell Propeller, LLC (0855100373) | Piqua | OH | Transportation Equipment Manufacturing336413 | 100-499 | ◐ LIKELY ACTIVE |
| HDHass Door CO | Wauseon | OH | Wood Product Manufacturing321911 | 100-499 | ◐ LIKELY ACTIVE |
| HPHaviland Plastic Products INC. | Haviland | OH | Plastics and Rubber Products Manufacturing326122 | 20-99 | ◐ LIKELY ACTIVE |
| HLHelical Line Products Company (0247030987) | Avon Lake | OH | Fabricated Metal Product Manufacturing332618 | 1-19 | ◐ LIKELY ACTIVE |
| HEHeraeus Epurio LLC | Vandalia | OH | Chemical Manufacturing325199 | 20-99 | ◐ LIKELY ACTIVE |
| HEHerbert E. Orr Company | Paulding | OH | Fabricated Metal Product Manufacturing332111 | 20-99 | ◐ LIKELY ACTIVE |
| HUHerbert USA INC | Akron | OH | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| HAHexa Americas, INC. | Sidney | OH | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| HBHexpol Barberton | Barberton | OH | Chemical Manufacturing325991 | — | ◐ LIKELY ACTIVE |
| HLHfi LLC | Canal Winchester | OH | Transportation Equipment Manufacturing336322 | 100-499 | ◐ LIKELY ACTIVE |
| HMHildreth Mfg LLC | Marion | OH | Primary Metal Manufacturing331522 | 20-99 | ◐ LIKELY ACTIVE |
| HAHitachi Astemo Americas INC. | Findlay | OH | Transportation Equipment Manufacturing336322 | 100-499 | ◐ LIKELY ACTIVE |
| HTHi Tech Extrusion | Chardon | OH | Plastics and Rubber Products Manufacturing326121 | 20-99 | ◐ LIKELY ACTIVE |
| HMHi-tek Manufacturing INC | Mason | OH | Fabricated Metal Product Manufacturing332710 | 100-499 | ◐ LIKELY ACTIVE |
| HFHubbard Feeds INC | Botkins | OH | Food Manufacturing311119 | 20-99 | ◐ LIKELY ACTIVE |
| HPHubbell Power Systems / Ohio Brass | Wadsworth | OH | Computer and Electronic Product Manufacturing334413 | 20-99 | ◐ LIKELY ACTIVE |
| HIHuhtamaki, INC. | Franklin | OH | Paper Manufacturing322212 | 100-499 | ◐ LIKELY ACTIVE |
| IIIdeal Image INC | Englewood | OH | Wood Product Manufacturing321918 | 100-499 | ◐ LIKELY ACTIVE |
| IBImagine Baking, INC. | Sandusky | OH | Food Manufacturing311812 | 20-99 | ◐ LIKELY ACTIVE |
| IMInternational Metal Hose Company | Bellevue | OH | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| IDIpl Dayton INC. | Urbana | OH | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| IIIten Industries, INC. - Plant 1 (0204010112) | Ashtabula | OH | Plastics and Rubber Products Manufacturing326130 | 20-99 | ◐ LIKELY ACTIVE |
| JTJackson Tube Services INC | Piqua | OH | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| JIJefferson Industries | West Jefferson | OH | Transportation Equipment Manufacturing336111 | 500+ | ◐ LIKELY ACTIVE |
| JCJones-hamilton CO | Walbridge | OH | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| JPJtm Provisions CO INC | Harrison | OH | Food Manufacturing311612 | 500+ | ◐ LIKELY ACTIVE |
| KCKahle Company | Ottawa | OH | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| KAKaiser Aluminum | Heath | OH | Primary Metal Manufacturing331312 | 100-499 | ◐ LIKELY ACTIVE |
| KMKalida Manufacturing INC | Kalida | OH | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| KFKalmbach Feeds INC | Upper Sandusky | OH | Food Manufacturing311119 | 100-499 | ◐ LIKELY ACTIVE |
| KEKaufman Engineered Systems Addition 2025 | Waterville | OH | Machinery Manufacturing333249 | 100-499 | ◐ LIKELY ACTIVE |
| KUKern-liebers USA INC | Holland | OH | Fabricated Metal Product Manufacturing332611 | 20-99 | ◐ LIKELY ACTIVE |