| ACAtlantic Concrete MD, LLC | Cockeysville | MD | Nonmetallic Mineral Product Manufacturing327332 | 20-99 | ◐ LIKELY ACTIVE |
| HBHagerstown Block CO | Hagerstown | MD | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| SCSchuster Concrete Ready Mix Llc-hobbs Rd | Denton | MD | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| DGDaniel G. Schuster, LLC - Portable Plant #5 | Baltimore | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| MPMaryland Portable Concrete-riverside | Aberdeen | MD | Petroleum and Coal Products Manufacturing324121 | 20-99 | ◐ LIKELY ACTIVE |
| NNNew Ngc, INC. Dba National Gypsum Company | Highlandtown | MD | Nonmetallic Mineral Product Manufacturing327420 | — | ◐ LIKELY ACTIVE |
| PCPowercon Corporation | Severn | MD | Nonmetallic Mineral Product Manufacturing327110 | 100-499 | ◐ LIKELY ACTIVE |
| QCQuikrete Company | Perryville | MD | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| SSScientific Specialties Service INC | Hanover | MD | Nonmetallic Mineral Product Manufacturing327213 | 20-99 | ◐ LIKELY ACTIVE |
| TUThe United States Gypsum Company - Baltimore Plant | Baltimore | MD | Nonmetallic Mineral Product Manufacturing327390 | — | ◐ LIKELY ACTIVE |
| AHAmrize Hagerstown Cement Plant (formerly Holcim Ha | Hagerstown | MD | Nonmetallic Mineral Product Manufacturing327310 | — | ◐ LIKELY ACTIVE |
| CQCapital Quickrete | Clinton | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| CPConcrete Pipe & Products | Jessup | MD | Nonmetallic Mineral Product Manufacturing327332 | — | ◐ LIKELY ACTIVE |
| DGDaniel G. Schuster, INC. - Frederick Plant | Frederick | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials US Cement LLC | Union Bridge | MD | Nonmetallic Mineral Product Manufacturing327310 | — | ◐ LIKELY ACTIVE |
| LBLafarge Building Material INC | Sparrows Point | MD | Nonmetallic Mineral Product Manufacturing327310 | — | ◐ LIKELY ACTIVE |
| MCMerit Concrete | Laurel | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| RBRedland Brick | Rocky Ridge | MD | Nonmetallic Mineral Product Manufacturing327120 | — | ◐ LIKELY ACTIVE |
| SCSchuster Concrete Ready Mix, LLC | Owings Mills | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| SCS&g Concrete Brooklyn Plant | Baltimore | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| SCS&g Concrete Company | Odenton | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| CPContractors Precast CORP. | Davidsonville | MD | Nonmetallic Mineral Product Manufacturing327390 | 20-99 | ◐ LIKELY ACTIVE |
| OPOldcastle Precast INC. | Edgewood | MD | Nonmetallic Mineral Product Manufacturing327390 | — | ◐ LIKELY ACTIVE |
| BRBack River Wastewater Treatment Facility | Baltimore | MD | Nonmetallic Mineral Product Manufacturing327310 | — | ◐ LIKELY ACTIVE |
| BPBWIP Pavestone | Hagerstown | MD | Nonmetallic Mineral Product Manufacturing327331 | 20-99 | ◐ LIKELY ACTIVE |
| DMD.c. Materials | Hyattsville | MD | Nonmetallic Mineral Product Manufacturing327123 | — | ◐ LIKELY ACTIVE |
| DMDimensional Marble & Tile, INC. | Rockville | MD | Nonmetallic Mineral Product Manufacturing327991 | 20-99 | ◐ LIKELY ACTIVE |
| MCMachado Construction Company, INC. | Halethorpe | MD | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| MPMaryland Portable Concrete Elkton | Elkton | MD | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| PCPowercon Corporation | Severn | MD | Nonmetallic Mineral Product Manufacturing327110 | 100-499 | ◐ LIKELY ACTIVE |
| SMStrittmatter Materials, LLC Dba D.c. Materials | Hyattsville | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| TMTri-star Mining - Hampshire Hill Mine (no. 419) | Barton | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| AIAggregate Industries-aggregate Division | Hyattsville | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| DGDaniel G. Schuster Concrete/h | Hagerstown | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| DFDay, F.o. Bituminous - Piney Mtg | Rockville | MD | Nonmetallic Mineral Product Manufacturing327992 | — | ◐ LIKELY ACTIVE |
| LMLafarge Mid-atlantic INC Rockville Rmx | Rockville | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| LCLehigh Cement CO | Woodsboro | MD | Nonmetallic Mineral Product Manufacturing327992 | — | ◐ LIKELY ACTIVE |
| NNNew Ngc INC (dba National Gypsum Co) | Belcamp | MD | Chemical Manufacturing325520 | — | ◐ LIKELY ACTIVE |
| OAOldcastle Apg Mid-atlantic Crofton, Md | Odenton | MD | Nonmetallic Mineral Product Manufacturing327331 | — | ◐ LIKELY ACTIVE |
| RMRecovermat Mid-atlantic, LLC | Baltimore | MD | Nonmetallic Mineral Product Manufacturing327992 | — | ◐ LIKELY ACTIVE |
| RBRedland Brick | Williamsport | MD | Nonmetallic Mineral Product Manufacturing327120 | — | ◐ LIKELY ACTIVE |
| RMRinker Materials Hydro Conduit- Frederick | Frederick | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| RTRock Tops Fabrication INC | Owings Mills | MD | Nonmetallic Mineral Product Manufacturing327991 | 20-99 | ◐ LIKELY ACTIVE |
| SCSchuster Concrete Ready Mix Llc-guilford Rd | Jessup | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| SCSchuster Concrete Ready Mix Llc-southlawn Ln | Rockville | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| SCS&g Concrete Edgewood | Edgewood | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| BRBay Ready Mix of Maryland Llc | Baltimore | MD | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| BPBryantown Plant | Waldorf | MD | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| CCrofton | Crofton | MD | Nonmetallic Mineral Product Manufacturing327331 | 20-99 | ◐ LIKELY ACTIVE |
| CSC.R. Semler Inc | Smithsburg, Md | MD | Nonmetallic Mineral Product Manufacturing327390 | 20-99 | ◐ LIKELY ACTIVE |