| LPLongleaf Packaging | Holly Hill | SC | — | ◇ UNVERIFIED |
| LCLopez Concrete Plant | Madison | AL | — | ◇ UNVERIFIED |
| LJLottie Jones Wilbert Production Facility | Lottie | LA | — | ◇ UNVERIFIED |
| LRLottman Ready Mix (portable) | Portable | KS | — | ◇ UNVERIFIED |
| LRLottman Ready Mix - Port Concrete Bp | Hugo | CO | — | ◇ UNVERIFIED |
| LCLotts Concrete Products, INC. | Fort Myers | FL | — | ◇ UNVERIFIED |
| LRLoughman Ready Mix Plant, Maschmeyer Concrete | Davenport | FL | — | ◇ UNVERIFIED |
| LRLoveland Ready Mix | Loveland | CO | — | ◇ UNVERIFIED |
| LRLoveland Ready Mix Concrete | Loveland | CO | — | ◇ UNVERIFIED |
| LRLoveland Ready Mix Concrete - Green Pit | Johnstown | CO | — | ◇ UNVERIFIED |
| LRLoveland Ready Mix Concrete INC | Johnstown Area | CO | — | ◇ UNVERIFIED |
| LRLoveland Ready Mix Concrete INC | Loveland | CO | — | ◇ UNVERIFIED |
| LCLowes Concrete INC | Leitchfield | KY | — | ◇ UNVERIFIED |
| LCLowes Concrete Products INC - Ready Mix Plant | Leitchfield | KY | — | ◇ UNVERIFIED |
| LPL P G Ventures INC | Kearney | MO | — | ◇ UNVERIFIED |
| LPL&r Precast Concrete Works | Mission | TX | — | ◇ UNVERIFIED |
| LCL&s Concrete | New Bedford | MA | — | ◇ UNVERIFIED |
| LSL Suzio Concrete Company | Milford | CT | — | ◇ UNVERIFIED |
| LCLtj Concrete, LLC - Weber Business Park | Dove Creek | CO | — | ◇ UNVERIFIED |
| LILtm INC | Roseburg | OR | — | ◇ UNVERIFIED |
| LILtm INC | Sutherlin | OR | — | ◇ UNVERIFIED |
| LILtm INC | Roseburg | OR | — | ◇ UNVERIFIED |
| LILtm INC | Klamath Falls | OR | — | ◇ UNVERIFIED |
| LILtm INC | Roseburg | OR | — | ◇ UNVERIFIED |
| LILtm INC | Roseburg | OR | — | ◇ UNVERIFIED |
| LILtm INC | Roseburg | OR | — | ◇ UNVERIFIED |
| LILtm INC | Roseburg | OR | — | ◇ UNVERIFIED |
| LSLuck Stone - South Richmond Plant | Richmond | VA | — | ◇ UNVERIFIED |
| LCLudlow Companies, LLC | Nampa | ID | — | ◇ UNVERIFIED |
| LCLusk Concrete Batch Plant | Niobrara | WY | — | ◇ UNVERIFIED |
| LILycon INC | Madison | WI | — | ◇ UNVERIFIED |
| LILycon INC - Middleton - University Ave | Middleton | WI | — | ◇ UNVERIFIED |
| LILycon INC - Plant #10 | Sauk City | WI | — | ◇ UNVERIFIED |
| LSLyman-richey Sand & Gravel 07 | Valley | NE | — | ◇ UNVERIFIED |
| LCLynch CORP. | South Kingstown | RI | — | ◇ UNVERIFIED |
| LRLynch Ready Mix Concrete Company, INC. | Solvang | CA | — | ◇ UNVERIFIED |
| LGLyngso Garden Materials INC | Redwood City | CA | — | ◇ UNVERIFIED |
| MCMabank Cbp No 1 | Mabank | TX | — | ◇ UNVERIFIED |
| MTMachmeyer - Tampa 36th Ave | Tampa | FL | — | ◇ UNVERIFIED |
| MCMack Concrete Industries, INC. | Salt Springs | FL | — | ◇ UNVERIFIED |
 Mack Industries INC | White Lake | MI | — | ◇ UNVERIFIED |
| MAMaclellan Amesbury | Amesbury | MA | — | ◇ UNVERIFIED |
| MCMacon Concrete Products INC | San Antonio | TX | — | ◇ UNVERIFIED |
| MMMacro Mix INC. | Hormigueros | PR | — | ◇ UNVERIFIED |
| MFMaddens Facility | Caldwell | ID | — | ◇ UNVERIFIED |
| MDMad Dog Concrete LLC | Rock Island | IL | — | ◇ UNVERIFIED |
| MDMad Dog Concrete LLC | Rock Island | IL | — | ◇ UNVERIFIED |
| MDMad Dog Concrete LLC | Hennepin | IL | — | ◇ UNVERIFIED |
| MDMad Dog Concrete LLC | Milan | IL | — | ◇ UNVERIFIED |
| MDMad Dog Concrete LLC | Milan | IL | — | ◇ UNVERIFIED |
| MCMadera Cemex Ready Mix | Madera | CA | — | ◇ UNVERIFIED |
| MSMadisonville Srm Terminal | Madisonville | TN | — | ◇ UNVERIFIED |
| MPMadsen Pit (aka Casper Pit) | Natrona County | WY | — | ◇ UNVERIFIED |
| MVMagic Valley Wind Farm Cbp 1 & 2 Sn12956015293 Sn1290515294 | Raymondville | TX | — | ◇ UNVERIFIED |
| MEMagna Energy Services Facility | Campbell County | WY | — | ◇ UNVERIFIED |
| MCMagnolia Cbp | Magnolia | TX | — | ◇ UNVERIFIED |
| MRMagnolia Rmc Plant | Magnolia | TX | — | ◇ UNVERIFIED |
| MPMagnum Pacific INC | Martinez | CA | — | ◇ UNVERIFIED |
| MPMagnum Pacific INC | San Jose | CA | — | ◇ UNVERIFIED |
| MRMainline Ready Mix | Fort Myers | FL | — | ◇ UNVERIFIED |
| MCMajor Concrete | Green Cove Springs | FL | — | ◇ UNVERIFIED |
| MCMajor Concrete 2 New Kings Road Facility | Jacksonville | FL | — | ◇ UNVERIFIED |
| MRMammoth Ready Mix | Mammoth Lakes | CA | — | ◇ UNVERIFIED |
| MLManafort-precision, LLC | Worcester | MA | — | ◇ UNVERIFIED |
| MLManafort-precision, LLC | Worcester | MA | — | ◇ UNVERIFIED |
| MIManatt's INC - Huxley | Huxley | IA | — | ◇ UNVERIFIED |
| MIManatt's INC - Newton | Newton | IA | — | ◇ UNVERIFIED |
| MBManhole Builders Incorporated | Corona | CA | — | ◇ UNVERIFIED |
| MCManor Concrete Enterprises, LLC Plant 1 | Hedgesville | WV | — | ◇ UNVERIFIED |
| MAManuel a Avila, Dba - Central Concrete | Los Banos | CA | — | ◇ UNVERIFIED |
| MAMarathon Ashland Petroleum LLC | Robinson | IL | — | ◇ UNVERIFIED |
| MSMarathon Staffing Services, INC. | Londonderry | NH | — | ◇ UNVERIFIED |
| MSMarathon Staffing Services, INC. | Hudson | NH | — | ◇ UNVERIFIED |
| MYMarathon Yard | Marathon | FL | — | ◇ UNVERIFIED |
| MPMar-con Products INC | San Marcos | CA | — | ◇ UNVERIFIED |
| MRMaricopa Ready Mix | Coolidge | AZ | — | ◇ UNVERIFIED |
| MMMark Miller LLC Concrete Plant | Portable | NE | — | ◇ UNVERIFIED |
| MTMark Twain Holding CO Llc, Marina Commerce Center | Olive Branch | MS | — | ◇ UNVERIFIED |
| MTMark Twain Redi-mix INC | Rantoul | IL | — | ◇ UNVERIFIED |
| MTMark Twain Redi Mix Plant | Horn Lake | MS | — | ◇ UNVERIFIED |
| MCMarlette Concrete Prod INC | Marlette | MI | — | ◇ UNVERIFIED |
| MCMarquis Concrete & Stone LLC | Hennepin | IL | — | ◇ UNVERIFIED |
| MCMarsich Crane, INC | Billings | MT | — | ◇ UNVERIFIED |
| MEMartin Enterprises | Kennedale | TX | — | ◇ UNVERIFIED |
| MEMartin Enterprises Dba Tj Composites | Nuevo | CA | — | ◇ UNVERIFIED |
| MCMartinez Const & Dev CO / Hanging Lakes/ Portable | Unk | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta | Van | TX | — | ◇ UNVERIFIED |
| MMMartin Marietta Arizona, LLC - Beeline Plant | Scottsdale | AZ | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials, INC. | Shreveport | LA | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials, INC. | Severance | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials, INC. - Wilmington Concrete | Wilmington | NC | — | ◇ UNVERIFIED |
| MMMartin Marietta Mat - Port Hmap & Gen | Colorado Springs | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta Mtrls - Batch Plant | Littleton | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta Mtrls - Batch Plant | Estes Park | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta/portable #130 | Pine Bluff | AR | — | ◇ UNVERIFIED |
| MMMartin Marietta - Rigden Ready Mix | Fort Collins Area | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta - South Santa Fe | Erie | CO | — | ◇ UNVERIFIED |
| MMMartin Materials CORP | Rochelle | IL | — | ◇ UNVERIFIED |
| MRMarysville Ready Mix Co., INC. | Marysville | KS | — | ◇ UNVERIFIED |
| MSMarzano & Sons General Engineering, INC. | Mammoth Lakes | CA | — | ◇ UNVERIFIED |
