| CACadence Aerospace Giddens Operations | Everett | WA | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| CICadman INC Gold Bar | Gold Bar | WA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CMCadman Materials, INC (cadman) | Arlington | WA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| COCadman Orchards Facility | Vancouver | WA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CRCadman Redmond | Redmond | WA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| CSCadman Seattle INC | Seattle | WA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CCCalgon CORP | Kalama | WA | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| CCCalvert CO INC Washougal | Washougal | WA | Wood Product Manufacturing321213 | — | ◇ UNVERIFIED |
| CICalvert Industries | Snohomish | WA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| CLCapital Lumber | Tacoma | WA | Wood Product Manufacturing321212 | — | ◇ UNVERIFIED |
| CACargill Animal Nutrition | Burlington | WA | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| CTCarlile Transportation Systems | Tacoma | WA | Nonmetallic Mineral Product Manufacturing327993 | — | ◇ UNVERIFIED |
| CFCarlson Formetec INC | Tacoma | WA | Fabricated Metal Product Manufacturing332112 | — | ◇ UNVERIFIED |
| CPCarlson Paving Products INC 50th Ave E | Tacoma | WA | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| CMCascade Metallurgical INC | Kent | WA | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| CICaterpillar INC | Spokane | WA | Textile Product Mills314910 | — | ◇ UNVERIFIED |
| CFCb Finishing | Seattle | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CSCbi Services | Everett | WA | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| CCCcp Composites US LLC Centralia | Centralia | WA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| CMCdc Mead | Mead | WA | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| CPCemco Products Site | Everett | WA | Fabricated Metal Product Manufacturing332996 | — | ◇ UNVERIFIED |
| CMCentennial Mills Div Adm Milling | Spokane | WA | Food Manufacturing311211 | — | ◇ UNVERIFIED |
| CPCentral Pre-mix Concrete Company Yakima | Yakima | WA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| CWCentral Washington Concrete Ephrata | Ephrata | WA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| CTCertain Teed Gypsum INC | Kent | WA | Nonmetallic Mineral Product Manufacturing327420 | — | ◇ UNVERIFIED |
| CPChemical Proof Corporation Site | Woodinville | WA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CCChemi Con Materials | Moses Lake | WA | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| CPChemtrade Performance Chemicals US LLC | Kalama | WA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| CSChemtrade Solutions LLC Vancouver | Vancouver | WA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| COChief Orchards W Chestnut Plant | Yakima | WA | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| CSChristensen Shipyards LTD | Vancouver | WA | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| CAChs Agronomy Terminal | Clarkston | WA | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
 Circuit Services Worldwide Site | Bellevue | WA | Computer and Electronic Product Manufacturing334412 | — | ◇ UNVERIFIED |
| CWCjc West LLC | Chehalis | WA | Chemical Manufacturing325194 | — | ◇ UNVERIFIED |
| CCClark County Public Works 149th St | Brush Prairie | WA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CWCliffstar Walla Walla | Walla Walla | WA | Food Manufacturing311411 | — | ◇ UNVERIFIED |
| CPClover Park Technical College Bldg 25 | Lakewood | WA | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| CICmc Icos Biologics INC | Bothell | WA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| CMCoastal Manufacturing | Everett | WA | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| CPCoastcraft Property | Tacoma | WA | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| CECoast Engine and Equipment CORP | Tacoma | WA | Machinery Manufacturing333913 | — | ◇ UNVERIFIED |
| COCoca-cola of Yakima | Yakima | WA | Transportation Equipment Manufacturing336213 | — | ◇ UNVERIFIED |
| CIColmac Industries Site | Colville | WA | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| CIColorgraphics INC Kent | Kent | WA | Apparel Manufacturing315299 | — | ◇ UNVERIFIED |
| CTColor Technology | Vancouver | WA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CBColumbia Business Center Bldg 33 | Vancouver | WA | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| CCColumbia Chrome | Spokane | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CCColumbia Crest Winery and Estates | Paterson | WA | Beverage and Tobacco Product Manufacturing312130 | — | ◇ UNVERIFIED |
| CGColumbia Gorge Aluminum Site | Goldendale | WA | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| CLColumbia Lighting | Spokane | WA | Electrical Equipment, Appliance & Component Manufacturing335122 | — | ◇ UNVERIFIED |
