| RBRiverview Block INC. | Berwick | PA | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| RLRock Lake Incorporated | Lake Como | PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| RRRock Ridge Stone, Incorporated | Montrose | PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| RORohn Ornamental Concrete INC | Bethlehem | PA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| RGRome Granite and Tile LLC | Allentown | PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| RGRoth Glass CO. | Pittsburgh | PA | Nonmetallic Mineral Product Manufacturing327213 | — | ◇ UNVERIFIED |
| RPR P Engineering | Morton | PA | Nonmetallic Mineral Product Manufacturing327993 | — | ◇ UNVERIFIED |
| RSR.w. Sidley, INC. | Slippery Rock | PA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| RSR.w. Sidley, INC. | Youngwood | PA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| SCSaint-gobain Ceramic Materials | Latrobe | PA | Nonmetallic Mineral Product Manufacturing327125 | — | ◇ UNVERIFIED |
| SBSchless Bottles Inc. | Allentown | PA | Nonmetallic Mineral Product Manufacturing327211 | — | ◇ UNVERIFIED |
| SCSemper Concrete Products | Butler | PA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| SASeverino Addesso and Son, INC. | Colmar | PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| SBSeymore Bros, INC. | Altoona | PA | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| SCSgl Carbon, LLC | St Marys | PA | Nonmetallic Mineral Product Manufacturing327992 | — | ◇ UNVERIFIED |
| SBShaffer Block & Concrete Products | Somerset | PA | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| SLSilver Lake Studios | Fombell | PA | Nonmetallic Mineral Product Manufacturing327213 | — | ◇ UNVERIFIED |
| SCSilvi Concrete of Chester, LLC | King of Prussia | PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SCSilvi Concrete of Downingtown | Downingtown | PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SCSilvi Concrete of Limerick | Pottstown | PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SCSilvi Concrete of Limerick | Limerick | PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SCSilvi Concrete of Philadelphia | Philadelphia | PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SHSouth Hills Cement Contracting | Pittsburgh | PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SGSpecialized Grinding Systems Dba Slicing Tech | Bangor | PA | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| SCSR Concrete Resurfacing, Inc. | Luthersburg | PA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| SGStained Glass By Pamela | Allison Park | PA | Nonmetallic Mineral Product Manufacturing327211 | — | ◇ UNVERIFIED |
| SGStained Glass Corner, INC. | Warrendale | PA | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| SCStandard Ceramic Supply Company | Carnegie | PA | Nonmetallic Mineral Product Manufacturing327110 | — | ◇ UNVERIFIED |
| SCStephen Clay LLC | Philadelphia | PA | Nonmetallic Mineral Product Manufacturing327110 | — | ◇ UNVERIFIED |
| SHStoke Hole Pottery | Indiana | PA | Nonmetallic Mineral Product Manufacturing327110 | — | ◇ UNVERIFIED |
| SDSunworks Decorative Concrete LLC | Annville | PA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| TCTarr Concrete & Supplies, INC. | Washington | PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| TCThe Ceramic Shop | Philadelphia | PA | Nonmetallic Mineral Product Manufacturing327112 | — | ◇ UNVERIFIED |
| TLThe Lane Construction Crafton | Pittsburgh, Pa | PA | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| TOTherm O Rock Inc/new Eagle Plt | New Eagle | PA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| TWThe Window Factory | Pittsburgh | PA | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| TRThree Rivers Art Glass LLC | Saxonburg | PA | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| TSTimeless Stone Fabrication Inc. | Perkasie | PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| TSTitusville Supply Company | Titusville | PA | Nonmetallic Mineral Product Manufacturing327310 | — | ◇ UNVERIFIED |
| TFTop Floor llc | Zelienople | PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| TMTri-state Marble and Granite | Philadelphia | PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| TITrojan, INC. | Meadville | PA | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| TGTroy Granite | Pittsburgh | PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| TGTroy Granite INC. | Camp Hill | PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| UBUnited Block CO. | Chicora | PA | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| UNUsace New River Chamber Batch Concrete Plt | Monaca | PA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| UDU.s. Dol Osha | Chambersburg | PA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| VCVulcan Const Hanover Quarry & Carmeuse Lime Kilns | Hanover | PA | Nonmetallic Mineral Product Manufacturing327992 | — | ◇ UNVERIFIED |
| WCWesterwald Corporation of America | Scenery Hill | PA | Nonmetallic Mineral Product Manufacturing327110 | — | ◇ UNVERIFIED |
| WGWestmoreland Glass Block | North Huntingdon | PA | Nonmetallic Mineral Product Manufacturing327211 | — | ◇ UNVERIFIED |