| AWAlside Windows Nw | Bothell | WA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| AKAmazon.com Kydc LLC Sea 6/8 | Bellevue | WA | Food Manufacturing311520 | — | ◇ UNVERIFIED |
| APAmerican Plating | Tacoma | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| ASAmerican Silicon Technologies | Rock Island | WA | Primary Metal Manufacturing331112 | — | ◇ UNVERIFIED |
| AAAmetek Aerospace Mukilteo | Mukilteo | WA | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| AWAmli Wallingford | Seattle | WA | Computer and Electronic Product Manufacturing334418 | — | ◇ UNVERIFIED |
| ACAmtech Corporation Site | Yelm | WA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| ASAo Smith Water Products CO | Renton | WA | Fabricated Metal Product Manufacturing332420 | — | ◇ UNVERIFIED |
| AIApex in Care of Pacific Shipping | Kent | WA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| AIApplied Industrial Technologies | Spokane | WA | Transportation Equipment Manufacturing336320 | — | ◇ UNVERIFIED |
| ASArchitectural Stone Werkes | Seattle | WA | Fabricated Metal Product Manufacturing332618 | — | ◇ UNVERIFIED |
| AWArch Wood Protection | Kalama | WA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| ABArt Brass Aerospace Finishing | Seattle | WA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| AWArtifex Wine | Walla Walla | WA | Fabricated Metal Product Manufacturing332431 | — | ◇ UNVERIFIED |
| ACArts Custom Chrome | Port Orchard | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| AAAsahipen America INC | Seattle | WA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
 Asko Processing Color Tech Site | Seattle | WA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| AIAttbar INC Vancouver | Vancouver | WA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| AQAuto Quest | Seattle | WA | Furniture and Related Product Manufacturing337127 | — | ◇ UNVERIFIED |
 Baker Commodities | Seattle | WA | Food Manufacturing311613 | — | ◇ UNVERIFIED |
| BAB and G Service | Cle Elum | WA | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| BKBanta Kent | Kent | WA | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| BDBarmon Door and Plywood Site | Lake Stevens | WA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| BCBasf Construction Chemicals INC | Kent | WA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| BLBayview Limousine Service | Seattle | WA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| BCBaywood Cabinet INC | Kent | WA | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| BBBbc Biochemical | Mount Vernon | WA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
 Be Aerospace Flight Structures Integrat | Arlington | WA | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| BBBelshaw Brothers INC | Seattle | WA | Machinery Manufacturing333294 | — | ◇ UNVERIFIED |
| BCBemis Company INC | Vancouver | WA | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| BOBerco of America Aftermarket | Puyallup | WA | Machinery Manufacturing333415 | — | ◇ UNVERIFIED |
| BDBetz Dearborn Washougal | Washougal | WA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| BKBingo King Tpi | Lynnwood | WA | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
 Bio Rad Laboratories Redmond | Redmond | WA | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| BHBlue Heron Biotech, LLC | Bothell | WA | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
 Blue Streak Finishers, Plant 1 Site | Everett | WA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BPBoc Process Gas Solutions | Vancouver | WA | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| BEBoeing Electronic Mfg | Seattle | WA | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| BEBoeing Everett Modification Center | Everett | WA | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| BMBoeing Military Flight Center | Tukwila | WA | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| BSBoeing South Park | Seattle | WA | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
 Boise Cascade Site | Vancouver | WA | Paper Manufacturing322121 | — | ◇ UNVERIFIED |
| BCBorden Chemical CO | Kent | WA | Food Manufacturing311823 | — | ◇ UNVERIFIED |
| BABremerton Auto Wrecking Landfill | Bremerton | WA | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| BIBrudi INC Kelso | Kelso | WA | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| BBBrundage Bone Concrete | Kent | WA | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| BTBrusco Tug and Barge | Cathlamet | WA | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| BWBuffelen Woodworking CO | Tacoma | WA | Wood Product Manufacturing321212 | — | ◇ UNVERIFIED |
| BTBulldog Trailers | Chehalis | WA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCablecom | Snohomish | WA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
