| HWHarbison Walker International | Thomasville | GA | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| HIHarbisonwalker international 1700 | southpoint | OH | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| HIHarbisonWalker International Vandalia | Vandalia | MO | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| HMHC Muddox | Sacramento | CA | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| HMHowmet - Morristown M4 | Morristown | TN | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| HFHWI - Fulton Brick | Fulton | MO | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| IPIberia plant | Iberia | OH | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| IBInterstate Brick | West Jordan | UT | Nonmetallic Mineral Product Manufacturing327120 | 100-499 | ◐ LIKELY ACTIVE |
| KUKelsen, USA | Tarentum | PA | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| LPLawrenceville Plant | Lawrenceville | VA | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| LCLECO Corporation -- Ceramics | Benton Harbor | MI | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| MRMagnesita Refractories Company - Huron | Huron | OH | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| MRMagnesita Refractories Pevely Plant | Pevely | MO | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| MHMB Holdings, LLC | Mangum | OK | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| MBmcavoy brick 2019 | Phoenixville | PA | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| MOMerry Oaks | Moncure | NC | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| MCMono Ceramics, INC | Benton Harbor | MI | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| MBMontgomery Brick Plant | Montgomery | AL | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| MAMorgan Advanced Materials Certech Inc | Wilkes Barre | PA | Nonmetallic Mineral Product Manufacturing327120 | 100-499 | ◐ LIKELY ACTIVE |
| MAMorgan Advanced Materials Certech Inc | Wilkes-Barre | PA | Nonmetallic Mineral Product Manufacturing327120 | 100-499 | ◐ LIKELY ACTIVE |
| MSMt Savage Specialty Refractories - Curwensville | Curwensville | PA | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| MSMt Savage Specialty Refractories - Ingomar | Ingomar | PA | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| PCPacific Clay Products, Inc. Castaic | Castaic | CA | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |
| PCPacific Clay Products, Inc. Lake Elsinore | Lake Elsinore | CA | Nonmetallic Mineral Product Manufacturing327120 | 100-499 | ◐ LIKELY ACTIVE |
| PIPandrol Inc | Napoleon | OH | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| PAPCC Airfoils, LLC - Ceramics Group (Lake Erie Design) | Wickliffe | OH | Nonmetallic Mineral Product Manufacturing327120 | 100-499 | ◐ LIKELY ACTIVE |
| 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 |