| PAPCC Airfoils, LLC - Ceramics Group (Sherwood Refractories) | Cleveland | OH | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| PPPCC PCC Airfoils, LLC Ceramics Group Sanford | Sanford | NC | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| PBPerla Brick Plants | Malvern | AR | Nonmetallic Mineral Product Manufacturing327120 | 100-499 | ◐ LIKELY ACTIVE |
| PPPittsburgh Plant | Cheswick | PA | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| PCPlibrico Company LLC | Northbrook | IL | Nonmetallic Mineral Product Manufacturing327120 | 100-499 | ◐ LIKELY ACTIVE |
| PPRCO-America | Hickory | KY | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| PCPrime Core, Inc. | Weyauwega | WI | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| PCPyrotek Cortland | Cortland | NY | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| RIRath inc. Missouri | Owensville | MO | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| RIRath Inc., Newark Facility | Newark | DE | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| RSRefractory Service Corp. | Hammond | IN | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| RSRefractory Service Corporation-East Chicago | East Chicago | IN | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| RMRex Materials of Kansas, LLC | Council Grove | KS | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| RMRHI Magnesita - East Canton | 6878 Osnaburg st | OH | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| RMRHI Magnesita Santa Fe Springs | Santa Fe Springs | CA | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| RRRocky Ridge Plant | Rocky Ridge | MD | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| SFSan Felipe Brick Plant | Sealy | TX | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| SCSEMCO Ceramics Inc. | Uhrichville | OH | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| SMStellar Materials LLC | Whitmore Lake | MI | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| SPSummerville plant | Summerville | PA | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| SCSunrock Ceramics | Broadview | IL | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| TCTexas Clay Brick Plants | Malakoff | TX | Nonmetallic Mineral Product Manufacturing327120 | 100-499 | ◐ LIKELY ACTIVE |
| TCThe Christy Refractories Company L.L.C. | St. Louis | MO | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| TITKG Industrial Ceramics | Allentown | PA | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| TPTriCircle Pavers Inc. Bartow | Bartow | FL | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| TPTriCircle Pavers Inc. Bayshore | North Fort Myers | FL | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| TBTulsa Brick Plant | Tulsa | OK | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| UOUnilock, Ohio - Rittman | Rittman | OH | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| UIUSB Indiana, LLC | Mooresville | IN | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| VRVesuvius Research Pittsburgh - Advanced Refractories | Pittsburgh | PA | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| WWadesboro | Wadesboro | NC | Nonmetallic Mineral Product Manufacturing327120 | 100-499 | ◐ LIKELY ACTIVE |
| RRRhi Refractories - Indian Hill | Ione | CA | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| 5H58789 - Harbisonwalker International INC | South Shore | KY | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ABAcme Brick | Fort Smith | AR | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ABAcme Brick Bridgeport Plant | Bridgeport | TX | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ABAcme Brick-clarksville Plant | Clarksville | AR | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ABAcme Brick Company | Castle Rock | CO | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ABAcme Brick - Texas Clay Plants | Malakoff | TX | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ABAcme Brick Tile & Stone Birmingham Plant | Leeds | AL | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ABAcme Brick-weir Plant | Weir | KS | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ARAdvanced Refractory Technologies | Carnegie | PA | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
Allied Mineral Products | Anniston | AL | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ARAlsey Refractories CO | Alsey | IL | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ABAmerican Bullnose Company of Texas LLC | Dallas | TX | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ACAmerican Clay Enterprises | Albuquerque | NM | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ACAmerican Colloid Company | Pickett | WI | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| AEAmerican Eagle Brick CO | Sunland Park | NM | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ARAnh Refractories CO. INC. | Fulton | MO | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| ACApplied Ceramics INC | Fremont | CA | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| AFAthens Facility | Athens | TX | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |