| MAModular Arts | Kent | — | ◇ UNVERIFIED |
| MSMountain Strong Concrete, Inc. | Tacoma | — | ◇ UNVERIFIED |
| MBMt Baker Silo INC | Lynden | — | ◇ UNVERIFIED |
| MMud | Bellingham | — | ◇ UNVERIFIED |
| MMMutual Materials | Mica | — | ◇ UNVERIFIED |
| MMMutual Materials CO | Renton | — | ◇ UNVERIFIED |
| MMMutual Materials Lakewood Block Plt | Tacoma | — | ◇ UNVERIFIED |
| MMMutual Materials Newcastle Lot 4 Cr Site | Newcastle | — | ◇ UNVERIFIED |
| NANorth American Refractories Site | Renton | — | ◇ UNVERIFIED |
| NHNorth Hill Resources | Burlington | — | ◇ UNVERIFIED |
| NINorthwestern Industries | Seattle | — | ◇ UNVERIFIED |
| OSOrnamental Stone INC | Allyn | — | ◇ UNVERIFIED |
| PCPacific Coast Memorials, Inc. | Granite Falls | — | ◇ UNVERIFIED |
| PNPacific Northwest Glass & Mirror, LLC | Vancouver | — | ◇ UNVERIFIED |
| PSPacific Stone Company Inc. | Everett | — | ◇ UNVERIFIED |
| PSPacific Stone & Tile LLC | Tumwater | — | ◇ UNVERIFIED |
| PCPepsi Cola Bottling Company of Everett | Everett | — | ◇ UNVERIFIED |
| PEPioneer Enamel Manufacture | Seattle | — | ◇ UNVERIFIED |
| PGPriceless Granite | Granite Falls | — | ◇ UNVERIFIED |
| PNPse North King Svc Ctr | Redmond | — | ◇ UNVERIFIED |
| QTQuarry Tile CO | Spokane | — | ◇ UNVERIFIED |
| QMQuiring Monuments, Inc. | Kent | — | ◇ UNVERIFIED |
| RGRas Granite & Marble | Tacoma | — | ◇ UNVERIFIED |
| RHRock Hill Concrete LLC | Dayton | — | ◇ UNVERIFIED |
| SIScrivanich in | Bellingham | — | ◇ UNVERIFIED |
| SNScrivanich Natural Stone | Woodinville | — | ◇ UNVERIFIED |
| SPSeattle Pottery Supply | Seattle | — | ◇ UNVERIFIED |
| SCShope Concrete Products CO | Puyallup | — | ◇ UNVERIFIED |
| SBSkookumchuck Batch Plants | Rainier | — | ◇ UNVERIFIED |
| SSStix & Stones INC | Spokane | — | ◇ UNVERIFIED |
| SRStrong Running Inc. | Seattle | — | ◇ UNVERIFIED |
| SISurplus Items INC | Seattle | — | ◇ UNVERIFIED |
| TGTacoma Glass Manufacturing | Burlington | — | ◇ UNVERIFIED |
| TFTGM Frederickson, LLC | Tacoma | — | ◇ UNVERIFIED |
| TSTops Solid Surface CO | Lacey | — | ◇ UNVERIFIED |
| USUnique Stoneworks, INC | Tukwila | — | ◇ UNVERIFIED |
| UIUsg Interiors INC 99 Site | Milton | — | ◇ UNVERIFIED |
| VRVancouver Readymix | Vancouver | — | ◇ UNVERIFIED |
| WAWa317934818 - Architectural Precast Accessories CO INC | Snohomish | — | ◇ UNVERIFIED |
| WHWa317935400 - H2 Pre-cast INC | East Wenatchee | — | ◇ UNVERIFIED |
| WMWa317935881 - Mutual Materials Company | Kent | — | ◇ UNVERIFIED |
| WWWa317936751 - Washington Marble Works INC | Sumner | — | ◇ UNVERIFIED |
| WSWa317936752 - Shope Enterprises INC | Puyallup | — | ◇ UNVERIFIED |
| WCWa317936757 - Cpc Materials INC | Lake Stevens | — | ◇ UNVERIFIED |
| WEWa317936922 - Ennco Display Systems INC | Redmond | — | ◇ UNVERIFIED |
| WMWa317937176 - Mutual Materials Company | Mica | — | ◇ UNVERIFIED |
| WWWa317937188 - Wall to Wall Tile & Stone LLC | Vancouver | — | ◇ UNVERIFIED |
| WTWa317937677 - Take US for Granite LLC | Battle Ground | — | ◇ UNVERIFIED |
| WTWa317937903 - Tops Solid Surface CO | Lacey | — | ◇ UNVERIFIED |
| WTWa317937904 - Tops Solid Surface CO | Lacey | — | ◇ UNVERIFIED |
