| KRKaysville Ready Mix | Kaysville | UT | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KKeystone | Carlton | GA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◐ LIKELY ACTIVE |
| KRKnife River Corporation - ND Detroit Lakes | Detroit Lakes | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KRKnife River Corporation - ND Devils Lake | Devils Lake | ND | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KRKnife River Corporation - ND Minot RMX | Minot | ND | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KRKnife River Materials-Concrete | Bemidji | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KBKOAD Bomat | Kailua-Kona | HI | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◐ LIKELY ACTIVE |
| KBKOAD Bomat | Kailua Kona | HI | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◐ LIKELY ACTIVE |
| KBKRC Becker RMX | Becker | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Alexandria RMX | Alexandria | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Annandale RMX | Annandale | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Bordwell RMX | Deerwood | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Braham Precast | Isanti | MN | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Chloride | Little Falls | MN | Nonmetallic Mineral Product Manufacturing327310 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Glencoe RMX | Glencoe | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Hutchinson RMX | Hutchinson | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Isanti RMX | Isanti | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Milaca RMX | Milaca | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Pine River RMX | Pine River | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC Richmond GC RMX | Richmond | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC St Cloud RMX | St Cloud | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC St Cloud RMX | Saint Cloud | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC St Joe RMX | St Joseph | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KNKRC NC St Joe RMX | Saint Joseph | MN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| KCKuhlman Corporation - Monroe MI | Monroe | MI | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LFLake Forest Plant #18 | Foothill Ranch | CA | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LILamvin inc | Oceanside | CA | Nonmetallic Mineral Product Manufacturing327993 | 1-19 | ◐ LIKELY ACTIVE |
| LPLansing Products | Lansing | MI | Nonmetallic Mineral Product Manufacturing327331 | 1-19 | ◐ LIKELY ACTIVE |
| LRLansing Ready Mix | Lansing | MI | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LMLASM Monarch Mountain | Boulder City | NV | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◐ LIKELY ACTIVE |
| LCLauren Concrete - Plant 1 | Austin | TX | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LCLauren Concrete - Plant 6 | Manor | TX | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LBLawn Barber INC / Phaneuf Stone | Ashby | MA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◐ LIKELY ACTIVE |
| LBLawrenceburg Burial Vault Company | Lawrenceburg | TN | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◐ LIKELY ACTIVE |
| LCLBFoster CXT Leesburg Concrete products | Leesburg | FL | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◐ LIKELY ACTIVE |
| LRLeesport RMC Plant | Leesport | PA | Petroleum and Coal Products Manufacturing324121 | 1-19 | ◐ LIKELY ACTIVE |
| LCLens Concrete Services | Jonestown | PA | Nonmetallic Mineral Product Manufacturing327331 | 1-19 | ◐ LIKELY ACTIVE |
| LLetterkenny | Chambersburg | PA | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◐ LIKELY ACTIVE |
| LPLewisburg Plant | Lewisburg | PA | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LPLexington Park Plant | Lexington Park | MD | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LLimerick | Pottstown | PA | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LCLincoln Concrete Plant | Lincoln | ME | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LLLitchfield Lab | Avondale | AZ | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LRLittle Rock Wilbert Burial Vault | Decatur | IL | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◐ LIKELY ACTIVE |
Locke Solutions LLC Formosa | Point Comfort | TX | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◐ LIKELY ACTIVE |
| LPLockland Plant 422 | Lockland | OH | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LBLong Beach Plant #47 | Long Beach | CA | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| LLLong Lane, PA | Lancaster | PA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◐ LIKELY ACTIVE |
| LPLucerne Plant #34 | Lucerne Valley | CA | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| MRMagnesita Refractories Company - Huron | Huron | OH | Nonmetallic Mineral Product Manufacturing327120 | 1-19 | ◐ LIKELY ACTIVE |