| 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 |
| MMMarkwest Michigan Pipeline CO LLC | Johannesburg | MI | — | ◇ UNVERIFIED |
| MUMarkwest Utica Emg, LLC | Cadiz | OH | — | ◇ UNVERIFIED |
| MCMarquis Concrete & Stone LLC | Hennepin | IL | — | ◇ UNVERIFIED |
| MCMartinez Const & Dev CO / Hanging Lakes/ Portable | Unk | CO | — | ◇ UNVERIFIED |
| MRMartinez Refining Company LLC (previously Shell Oil Products Us, Martinez Ref.) | Martinez | CA | — | ◇ 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 |
| MHMarysville Hydrocarbons | Marysville | MI | — | ◇ UNVERIFIED |
| MRMarysville Ready Mix Co., INC. | Marysville | KS | — | ◇ UNVERIFIED |
| MSMarzano & Sons General Engineering, INC. | Mammoth Lakes | CA | — | ◇ UNVERIFIED |
| MBMaschmeyer - Brooksville | Brooksville | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Cbp - Melbourne | Melbourne | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete/brooks Street Facility | Lakeland | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete Company - Apollo | Apollo Beach | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-deltona Concrete Batch Plant | Deltona | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete Dewatering | Orlando | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-grant Facility | Valkaria | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-hickory Tree Rd | Saint Cloud | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete - Okeechobee Plant | Okeechobee | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete Rocket Blvd Facility | Orlando | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-st Cloud | Saint Cloud | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete - Winter Beach | Winter Beach | FL | — | ◇ UNVERIFIED |
| MRMaschmeyer-daytona Rm | Daytona Beach | FL | — | ◇ UNVERIFIED |
| MRMaschmeyer-okeechobee Rm | Okeechobee | FL | — | ◇ UNVERIFIED |
| MSMaschmeyer St. Pete | Saint Petersburg | FL | — | ◇ UNVERIFIED |
| MHMassey Holdings, LLC. | Marshall | AR | — | ◇ UNVERIFIED |
| MRMassey Ready-mix Concrete, INC. | Greensboro | NC | — | ◇ UNVERIFIED |
| MRMasseys Readi-mix Concrete Incorporated | Burlington | NC | — | ◇ UNVERIFIED |
| MCMaster Concrete Plant 5 | San Juan | PR | — | ◇ UNVERIFIED |
| MSMaterial Sand & Stone CORP. | North Smithfield | RI | — | ◇ UNVERIFIED |
| MPMaterials Packaging CORP | Harrisonville | MO | — | ◇ UNVERIFIED |
| MRMathews Ready Mix | Chico | CA | — | ◇ UNVERIFIED |
| MRMathews Readymix LLC | Yuba City | CA | — | ◇ UNVERIFIED |
| MRMathews Ready Mix Oroville | Oroville | CA | — | ◇ UNVERIFIED |
| MRMathews Ready Mix - Yuba City Plant | Yuba City | CA | — | ◇ UNVERIFIED |
| MCMathias Concrete INC | Monte Vista | CO | — | ◇ UNVERIFIED |
| MCMathias Concrete - South Fork | South Fork | CO | — | ◇ UNVERIFIED |
| MCMathis Concrete, LLC | Jonesville | NC | — | ◇ UNVERIFIED |
| MCMathis Concrete, Llc-roaring River | Roaring River | NC | — | ◇ UNVERIFIED |
| MOMatrix Oil Corporation - Rideout Heights | Whittier | CA | — | ◇ UNVERIFIED |
| MOMatrix Ops INC | Hayward | CA | — | ◇ UNVERIFIED |
| MPMattiace Petrochemical Co., INC. | Glen Cove | NY | — | ◇ UNVERIFIED |
| MRMattoon-charleston Ready Mix | Charleston | IL | — | ◇ UNVERIFIED |
| MWMatt Waite Excavation INC (dba Kelco Concrete) | Pawlet | VT | — | ◇ UNVERIFIED |
| MCMayan Concrete INC | Matteson | IL | — | ◇ UNVERIFIED |
| MCMay Concrete & Block Products CO INC | Allen City | KY | — | ◇ UNVERIFIED |
| MCMayson Concrete | Guyton | GA | — | ◇ UNVERIFIED |
| MCMbi Construction | Effingham | IL | — | ◇ UNVERIFIED |
| MCMbi Construction INC | Newton | IL | — | ◇ UNVERIFIED |
| MCMbi Construction INC | Newton | IL | — | ◇ UNVERIFIED |
| MCMbi Construction INC | Mattoon | IL | — | ◇ UNVERIFIED |
| MCMbi Constuction INC | Xenia | IL | — | ◇ UNVERIFIED |
| MRMbi Ready Mix Llc/hansen Bros | Colfax | CA | — | ◇ UNVERIFIED |
| MNMbt Nevada LLC | Henderson | NV | — | ◇ UNVERIFIED |
| MBMcalester Batch Plant | Mcalester | OK | — | ◇ UNVERIFIED |
| MHMccarthy Henderson Concrete Batch Plant | Henderson | NC | — | ◇ UNVERIFIED |
| MIMccarthy Improvement CO | East Moline | IL | — | ◇ UNVERIFIED |
| MIMccarthy Improvement Co.(epd-wcd) | Vienna | GA | — | ◇ UNVERIFIED |
| MIMccarthy Improvement Company | Hoover | AL | — | ◇ UNVERIFIED |
| MIMcc, INC. | Green Bay | WI | — | ◇ UNVERIFIED |
| MAMcclellan and Mcqueen INC | Riverton | WY | — | ◇ UNVERIFIED |
| MEMcconnell Exc | Quincy | IL | — | ◇ UNVERIFIED |
| MCMccreary County Ready Mix | Whitley City | KY | — | ◇ UNVERIFIED |
| MCMcdowell Concrete Supply, LLC | Marion | NC | — | ◇ UNVERIFIED |
| MBMcgee Brothers Company Incorporated | Midland | NC | — | ◇ UNVERIFIED |
| MRMcgregor Rd | Coahoma | TX | — | ◇ UNVERIFIED |
 Mc Industries INC Dba Kynmar Concrete | Merced | CA | — | ◇ UNVERIFIED |
| M1Mckittrick 17z Gas Plant | Mckittrick | CA | — | ◇ UNVERIFIED |
| MCMclean County Concrete CO | Bloomington | IL | — | ◇ UNVERIFIED |
| MMMc Materials 62 - Mountain View | Mountain View | MO | — | ◇ UNVERIFIED |
| MAMcpherson Agricultural Products LLC | Mcpherson | KS | — | ◇ UNVERIFIED |
| MRMeadville Redi-mix Concrete, INC. | Meadville | PA | — | ◇ UNVERIFIED |
| MRMeadville Redi Mix I/rt 322 | Meadville | PA | — | ◇ UNVERIFIED |
| MCMeba Contracting and Waste Services | Staten Island | NY | — | ◇ UNVERIFIED |
| MCMechanicsville Concrete LLC | Midlothian | VA | — | ◇ UNVERIFIED |
| MCMechanicsville Concrete Llc-airport Plant (portugee Road) | Sandston | VA | — | ◇ UNVERIFIED |
| MSMeeker Sand & Gravel INC | Meeker | CO | — | ◇ UNVERIFIED |
| MRMeiers Ready Mix, INC. | Topeka | KS | — | ◇ UNVERIFIED |
| MCMelissa Cbp | Mckinney | TX | — | ◇ UNVERIFIED |
| MPMelissa Plant a and B | Melissa | TX | — | ◇ UNVERIFIED |
| MCMenahga Concrete Products INC - Nonmetallic | Menahga | MN | — | ◇ UNVERIFIED |
| MRMena Ready Mix | Mena | AR | — | ◇ UNVERIFIED |
| MOMerchants Oil - Merchants Oil - | Denver | CO | — | ◇ UNVERIFIED |
