| SPSummerville plant | Summerville | PA | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| SSunbury | Sunbury | PA | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| TTaktl | Pittsburgh | PA | Nonmetallic Mineral Product Manufacturing327390 | 20-99 | ◐ LIKELY ACTIVE |
| TTarentum | Tarentum | PA | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| TETHERM-O-ROCK EAST, INC.- Donora Plant | Donora | PA | Nonmetallic Mineral Product Manufacturing327910 | 1-19 | ◐ LIKELY ACTIVE |
| TITKG Industrial Ceramics | Allentown | PA | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| TCTower City, PA | Tower City | PA | Nonmetallic Mineral Product Manufacturing327991 | 20-99 | ◐ LIKELY ACTIVE |
| T1Trulite 100 Business Center Drive | Cheswick | PA | Nonmetallic Mineral Product Manufacturing327215 | 100-499 | ◐ LIKELY ACTIVE |
| THTyrone HMA Plant | Tyrone | PA | Petroleum and Coal Products Manufacturing324121 | 1-19 | ◐ LIKELY ACTIVE |
| UUniontown | Hopwood | PA | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| VRVesuvius Research Pittsburgh - Advanced Refractories | Pittsburgh | PA | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| VTVibrantz Technologies KOP | King of Prussia | PA | Nonmetallic Mineral Product Manufacturing327999 | 20-99 | ◐ LIKELY ACTIVE |
| WWampum | Wampum | PA | Nonmetallic Mineral Product Manufacturing327331 | 20-99 | ◐ LIKELY ACTIVE |
| WPWatsontown Plant | Watsontown | PA | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| WRWestlake Royal Stone, LLC | Greencastle | PA | Nonmetallic Mineral Product Manufacturing327390 | 100-499 | ◐ LIKELY ACTIVE |
| WFWilbert Funeral Services Blairsville | Blairsville | PA | Nonmetallic Mineral Product Manufacturing327390 | 20-99 | ◐ LIKELY ACTIVE |
| WIWilkes-Barre IG | Mountain Top | PA | Nonmetallic Mineral Product Manufacturing327215 | 100-499 | ◐ LIKELY ACTIVE |
| APAmerican Precision Glass Corporation | Duryea | PA | Nonmetallic Mineral Product Manufacturing327215 | 1-19 | ◇ UNVERIFIED |
| ACAtlantic Custom Granite & Marble, INC. | Dallastown | PA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◇ UNVERIFIED |
| BSBello Stone LLC | Drumore | PA | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◇ UNVERIFIED |
| BGBrian Giniewski LLC | Philadelphia | PA | Nonmetallic Mineral Product Manufacturing327110 | 1-19 | ◇ UNVERIFIED |
| BSButler Stone Craft, INC. | Cabot | PA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◇ UNVERIFIED |
| DVDeihl Vault & Precast, INC. | Orangeville | PA | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◇ UNVERIFIED |
| GGGranite Galleria Fabrication, Inc. | Fort Washington | PA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◇ UNVERIFIED |
| HCHoy''s Construction Co., INC. | Waynesburg | PA | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◇ UNVERIFIED |
| IIIca, INC. | Lehighton | PA | Nonmetallic Mineral Product Manufacturing327993 | 1-19 | ◇ UNVERIFIED |
| IAIndustrial Abrasives CO. | Reading | PA | Nonmetallic Mineral Product Manufacturing327910 | 1-19 | ◇ UNVERIFIED |
| JBJason Burke | Throop | PA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◇ UNVERIFIED |
| KPKey Precast & Supply, INC. | Butler | PA | Nonmetallic Mineral Product Manufacturing327999 | 1-19 | ◇ UNVERIFIED |
| KCKeystone Concrete Block and Supply Company, INC. | Scranton | PA | Nonmetallic Mineral Product Manufacturing327331 | 20-99 | ◇ UNVERIFIED |
| KGKosmos Granite And Marble Inc | Huntingdon Valley | PA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◇ UNVERIFIED |
| LFLite Fibers, LLC | Ellwood City | PA | Nonmetallic Mineral Product Manufacturing327215 | 1-19 | ◇ UNVERIFIED |
| MSMeshoppen Stone INC. | Meshoppen | PA | Nonmetallic Mineral Product Manufacturing327991 | 100-499 | ◇ UNVERIFIED |
| MPMineral Processing Specialties Inc. | Springdale | PA | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◇ UNVERIFIED |
| NLNatstone, LLC | Montrose | PA | Nonmetallic Mineral Product Manufacturing327991 | 20-99 | ◇ UNVERIFIED |
| OSOutcast Studios, LLC | Philadelphia | PA | Nonmetallic Mineral Product Manufacturing327212 | 1-19 | ◇ UNVERIFIED |
| PBPenn Big Bed Slate CO INC | Slatington | PA | Nonmetallic Mineral Product Manufacturing327991 | 20-99 | ◇ UNVERIFIED |
| PGPremier Granite & Marble, Inc. | Pen Argyl | PA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◇ UNVERIFIED |
| PAProduction Abrasives, INC. | Hamilton | PA | Nonmetallic Mineral Product Manufacturing327910 | 1-19 | ◇ UNVERIFIED |
| SESeyler Enterprises INC. | Jersey Shore | PA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◇ UNVERIFIED |
| SGS&l Glassworks INC | Fairless Hills | PA | Nonmetallic Mineral Product Manufacturing327211 | 1-19 | ◇ UNVERIFIED |
| SISpectrocell, INC. | Oreland | PA | Nonmetallic Mineral Product Manufacturing327215 | 1-19 | ◇ UNVERIFIED |
| SCSteel City Glass, INC. | Pittsburgh | PA | Nonmetallic Mineral Product Manufacturing327215 | 1-19 | ◇ UNVERIFIED |
| SMSusquehanna Marble and Granite, LLC | Montoursville | PA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◇ UNVERIFIED |
| TITecho-bloc Incorporated | Pen Argyl | PA | Nonmetallic Mineral Product Manufacturing327331 | 100-499 | ◇ UNVERIFIED |
| TJT & J Hopper Building Supplies Inc | Gibsonia | PA | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◇ UNVERIFIED |
| UGUltimate Granite Surfaces, INC. | Gibsonia | PA | Nonmetallic Mineral Product Manufacturing327991 | 20-99 | ◇ UNVERIFIED |
| USUnited States Products CO. | Pittsburgh | PA | Nonmetallic Mineral Product Manufacturing327910 | 1-19 | ◇ UNVERIFIED |
| VCVacuum Ceramics, INC. | Mount Braddock | PA | Nonmetallic Mineral Product Manufacturing327110 | 1-19 | ◇ UNVERIFIED |
| WCWine Concrete Products, INC. | Sewickley | PA | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◇ UNVERIFIED |