| MCMadden Contracting Company LLC - Ap-9 | Mansfield | LA | — | ◇ UNVERIFIED |
| MEMaeser East Pit | Maeser | UT | — | ◇ UNVERIFIED |
| MWMaeser West Pit | Maeser | UT | — | ◇ UNVERIFIED |
| MCMago Construction CO LLC - Monticello Plant | Monticello | KY | — | ◇ UNVERIFIED |
| MLMagruder Limestone CO Inc-troy Quarry | Troy | MO | — | ◇ UNVERIFIED |
| MLMagruder Limestone Company Ashely Quarry | Bowling Green | MO | — | ◇ UNVERIFIED |
| MPMagruder Paving LLC (port-0667) | Portable | MO | — | ◇ UNVERIFIED |
| MBMallette Brothers Construction Company INC | Gautier | MS | — | ◇ UNVERIFIED |
| MBMallette Brothers Construction Company, Lucedale Asphalt Plant #2 | Lucedale | MS | — | ◇ UNVERIFIED |
| MAMalmo Asphalt Plant | Leland | NC | — | ◇ UNVERIFIED |
| MHMalouffs Hi Valley Paving | Alamosa | CO | — | ◇ UNVERIFIED |
| MIManatts, INC. | Brooklyn | IA | — | ◇ UNVERIFIED |
| MTMancils Tractor Service INC | Palm City | FL | — | ◇ UNVERIFIED |
| MHManor Hot Mix Plant | Manor | TX | — | ◇ UNVERIFIED |
| MLMansfield Lime & Stone Quarry INC. | Mountain Grove | MO | — | ◇ UNVERIFIED |
| MPMarathon Petroleum Company Lp- Louisville Cane Run Terminal | Louisville | KY | — | ◇ UNVERIFIED |
| MOMarine Oil Terminal | Chicago | IL | — | ◇ UNVERIFIED |
| MFMarionneaux #1 Facility | Livonia | LA | — | ◇ UNVERIFIED |
| MSMark Sand & Gravel Acquisition CO | Fergus Falls | MN | — | ◇ UNVERIFIED |
| MSMark Sand & Gravel CO - Nonmetallic | Fergus Falls | MN | — | ◇ UNVERIFIED |
| MPMarshall Paving Inc-marshall Paving INC | Marshall | MO | — | ◇ UNVERIFIED |
| MAMarsh Asphalt Dravosburg Plt | Dravosburg | PA | — | ◇ UNVERIFIED |
| MAMartin Asphalt - Hondo | Hondo | TX | — | ◇ UNVERIFIED |
| MMMartin Marietta | Malvern | AR | — | ◇ UNVERIFIED |
| MMMartin Marietta Aggregates - Fairfield | Fairfield | OH | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials, INC Dba I-75 Quarry (east) | Heiskell | TN | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials INC – East Division | Newport News | VA | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials, St. Paul Asphalt Terminal | Newport | MN | — | ◇ UNVERIFIED |
| MMMartin Marietta Mat - Port Hmap & Gen | Colorado Springs | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta - Monaghan Materials Fac | Aurora | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta - Pueblo Asphalt Plant | Pueblo | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta - Spec Agg | Golden | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta - Taft Asphalt | Fort Collins | CO | — | ◇ UNVERIFIED |
| MPMaryland Paving Churchville | Bel Air | MD | — | ◇ UNVERIFIED |
| MIMar-zane INC | Delaware | OH | — | ◇ UNVERIFIED |
| MIMar-zane, INC | Indianapolis | IN | — | ◇ UNVERIFIED |
| MIMar-zane, INC. | Noblesville | IN | — | ◇ UNVERIFIED |
| MIMar-zane INC Plant 2 | Marietta | OH | — | ◇ UNVERIFIED |
| MIMar-zane, INC. Plant #24 | Akron | OH | — | ◇ UNVERIFIED |
| MIMar-zane INC Plant 27 | Warren | OH | — | ◇ UNVERIFIED |
| MIMar-zane, INC. - Plant 28 | Youngstown | OH | — | ◇ UNVERIFIED |
| MPMar-zane Plant No 10 | Zanesville | OH | — | ◇ UNVERIFIED |
| MZMar Zane Plant No 4 (0637000000) | Haydenville | OH | — | ◇ UNVERIFIED |
| MZMar Zane Plant No 5 | Stockport | OH | — | ◇ UNVERIFIED |
| MZMar Zane Plant No 9 | Richmond Dale | OH | — | ◇ UNVERIFIED |
| MZMar Zane Plant No 9 (0671000006) | Chillicothe | OH | — | ◇ UNVERIFIED |
| MZMar Zane Portable Generator #6 | Grove City | OH | — | ◇ UNVERIFIED |
| MPMar-zane Portable Generator #8 | Marion | OH | — | ◇ UNVERIFIED |
| MAMassillon Asphalt Company (1576001624) | Massillon | OH | — | ◇ UNVERIFIED |
| MCMathy Construction Company - Plant 25 | Onalaska | WI | — | ◇ UNVERIFIED |
