| GUGosford USA | Everett | WA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| GSGraham Steel CORP | Kirkland | WA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| GCGranite Construction Company Omak | Okanogan | WA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| GCGrant County Airport | Moses Lake | WA | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◇ UNVERIFIED |
| GPGraphic Packaging International INC | Renton | WA | Paper Manufacturing322130 | — | ◇ UNVERIFIED |
| GHGrays Harbor Paper LP | Hoquiam | WA | Paper Manufacturing322000 | — | ◇ UNVERIFIED |
| GGreenberry | Vancouver | WA | Fabricated Metal Product Manufacturing332420 | — | ◇ UNVERIFIED |
| GRGreenbriar Rail Services | Kennewick | WA | Machinery Manufacturing333911 | — | ◇ UNVERIFIED |
| GCGreen Creek Wood Products | Port Angeles | WA | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
 Green Mountain Sawmill Site | Toutle | WA | Wood Product Manufacturing321912 | — | ◇ UNVERIFIED |
| GAGulassa and CO INC | Seattle | WA | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| HIHalosource INC | Raymond | WA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| HIHalosource INC | Bothell | WA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| HFHamilton Farm Equipment Center Okanogan | Okanogan | WA | Machinery Manufacturing333111 | — | ◇ UNVERIFIED |
| HLHampton Lumber Mills Arlington Di | Arlington | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| HLHampton Lumber Mills Packwood Site | Randle | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| HTHaney Truck Line INC | Tumwater | WA | Beverage and Tobacco Product Manufacturing312111 | — | ◇ UNVERIFIED |
| HIHarman International | Cheney | WA | Computer and Electronic Product Manufacturing334290 | — | ◇ UNVERIFIED |
| HTHeath Tecna INC | Bellingham | WA | Machinery Manufacturing333414 | — | ◇ UNVERIFIED |
| HBHeiser Body Company | Seattle | WA | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| HIHenrybuilt INC | Seattle | WA | Furniture and Related Product Manufacturing337121 | — | ◇ UNVERIFIED |
| HKHertco Kitchens LLC | Ferndale | WA | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| HSHewlett-packard Site | Lake Stevens | WA | Computer and Electronic Product Manufacturing334515 | — | ◇ UNVERIFIED |
| HCHexcel CORP Auburn | Auburn | WA | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| HVHidden Valley Transfer Station and Landfill | Puyallup | WA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| HBHobart Bakery Systems Orting | Orting | WA | Machinery Manufacturing333241 | — | ◇ UNVERIFIED |
| HCHolroyd CO Lakewood | Lakewood | WA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| HDHome Depot 8964 | Aberdeen | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| HGHoneybear Growers | Brewster | WA | Chemical Manufacturing325311 | — | ◇ UNVERIFIED |
| HIHoneywell INC | Renton | WA | Computer and Electronic Product Manufacturing334412 | — | ◇ UNVERIFIED |
| HIHuntwood Industries | Spokane | WA | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| HEHydro Extrusion Portland | Vancouver | WA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| HMHylebos Marina and Marine Scrap Yard | Tacoma | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| IEI90 Express Finishing INC | Spokane | WA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| I9I 90 Express Finishing Spokane Valley | Spokane Valley | WA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| IAIdd Aerospace Corporation | Redmond | WA | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| IFIndependent Food Processors CO | Sunnyside | WA | Food Manufacturing311421 | — | ◇ UNVERIFIED |
| IGIngenium Group LLC - Transfer Facility | Kent | WA | Machinery Manufacturing333995 | — | ◇ UNVERIFIED |
| INInland Northwest Dairies LLC | Spokane | WA | Food Manufacturing311511 | — | ◇ UNVERIFIED |
| INInland Nw Metallurgical Svs INC | Spokane | WA | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| IMIntegris Metals | Kent | WA | Machinery Manufacturing333131 | — | ◇ UNVERIFIED |
| IPInterfor Pacific INC | Marysville | WA | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| ITIntermec Technologies CORP | Everett | WA | Computer and Electronic Product Manufacturing334112 | — | ◇ UNVERIFIED |
| IAInternational Aero Interior LLC | Burlington | WA | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| IEInternational Electronics Site | Vancouver | WA | Computer and Electronic Product Manufacturing334000 | — | ◇ UNVERIFIED |
| IHInternational Hearth Melting LLC | Richland | WA | Primary Metal Manufacturing331419 | — | ◇ UNVERIFIED |
| ILInternational Lubricants INC | Seattle | WA | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| IPInternational Paper Bellevue | Bellevue | WA | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| IPInternational Paper Company | Moses Lake | WA | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| ICInterplastic Corporation | Kent | WA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
