| MCMid-america Concrete Applications, LLC | Lees Summit | MO | — | ◇ UNVERIFIED |
| MHMid Hudson Concrete Products, INC | Hasbrouck Heights | NJ | — | ◇ UNVERIFIED |
| MCMid-illinois Concrete INC | Sullivan | IL | — | ◇ UNVERIFIED |
| MCMidland Concrete Products | Hiawatha | IA | — | ◇ UNVERIFIED |
| MPMid-state Precast | Sebring | FL | — | ◇ UNVERIFIED |
| MPMid-state Precast, L.p. | Corcoran | CA | — | ◇ UNVERIFIED |
| MBMidwest Block and Brick | Springfield | MO | — | ◇ UNVERIFIED |
| MMMidwest Manufacturing | Pioneer | OH | — | ◇ UNVERIFIED |
| MPMidwest Product Group | Shawnee | KS | — | ◇ UNVERIFIED |
| MEMillard Enterprises, LLC | East Syracuse | NY | — | ◇ UNVERIFIED |
| MLMiller & Long Construction INC | Mc Lean | VA | — | ◇ UNVERIFIED |
| MPMiller-mize Precast INC. | Columbus | GA | — | ◇ UNVERIFIED |
| MWMillstone Weber - Port Batch Plant #7001 | Saint Charles | MO | — | ◇ UNVERIFIED |
| MPMineral Processing Specialties Inc. | Springdale | PA | — | ◇ UNVERIFIED |
| MIMinnick Illinois LLC | Joliet | IL | — | ◇ UNVERIFIED |
| MMMinnick Midwest LLC Dba Midwest Tile & Concrete Products | Woodburn | IN | — | ◇ UNVERIFIED |
| MWMissouri Wilbert Vault CO. INC. | Moberly | MO | — | ◇ UNVERIFIED |
| MCMitchell Concrete Pipe CO. INC. | Saginaw | AL | — | ◇ UNVERIFIED |
| MMM & M Precast INC | North East | MD | — | ◇ UNVERIFIED |
| MNM & N Manufacturing | Poughkeepsie | NY | — | ◇ UNVERIFIED |
| MCMoca Concrete Poles INC. | Moca | PR | — | ◇ UNVERIFIED |
| MCModern Concrete Incorporated | Moorhead | MN | — | ◇ UNVERIFIED |
| MDModern Disposal Services INC | Model City | NY | — | ◇ UNVERIFIED |
| MCMolin Concrete Products CO | Lino Lakes | MN | — | ◇ UNVERIFIED |
| MCMolin Concrete Products Company | Anoka | MN | — | ◇ UNVERIFIED |
| MPMonarch Precast Concrete CORP | Allentown | PA | — | ◇ UNVERIFIED |
| MPMonarch Products Company INC - Strinestown | York | PA | — | ◇ UNVERIFIED |
| MMonierlifetile | Tacoma | WA | — | ◇ UNVERIFIED |
| MLMonierlifetile L L C | Boca Raton | FL | — | ◇ UNVERIFIED |
| MLMonierlifetile L L C | Kansas City | MO | — | ◇ UNVERIFIED |
| MLMonierlifetile LLC | San Bernardino | CA | — | ◇ UNVERIFIED |
| MSMonty Sanitation | Fort Myers | FL | — | ◇ UNVERIFIED |
| MMMoonlight Molds, INC. | Gardena | CA | — | ◇ UNVERIFIED |
| MCMoore Construction | Dana Point | CA | — | ◇ UNVERIFIED |
| MEMotsinger Enterprises, INC. Dba Motsinger Precast | Winston Salem | NC | — | ◇ UNVERIFIED |
| MBMt Baker Silo INC | Lynden | WA | — | ◇ UNVERIFIED |
| MMMudart Molds | Pocatello | ID | — | ◇ UNVERIFIED |
| MCMurray Concrete Batch Plant G-2 | Murray | UT | — | ◇ UNVERIFIED |
| MTMurrill Tank Service, INC. | Mobile | AL | — | ◇ UNVERIFIED |
| MMMutual Materials Company | Clackamas | OR | — | ◇ UNVERIFIED |
| MMMutual Materials Lakewood Block Plt | Tacoma | WA | — | ◇ UNVERIFIED |
| NRNac Research and Development | Los Angeles | CA | — | ◇ UNVERIFIED |
| NCNative Custom Stone, LLC | Dawsonville | GA | — | ◇ UNVERIFIED |
| NFNatl Fuel Gas Supply/ellisburg Sta | Ellisburg | PA | — | ◇ UNVERIFIED |
| NFNatl Fuel Gas Supply/knox Station | Brookville | PA | — | ◇ UNVERIFIED |
| NRNavajo Rock & Block/cement | Paso Robles | CA | — | ◇ UNVERIFIED |
| NENcv Enterprises LLC | Palmetto | GA | — | ◇ UNVERIFIED |
| NINebco INC. | Grand Island | NE | — | ◇ UNVERIFIED |
| NPNebraska Precast, LLC | Columbus | NE | — | ◇ UNVERIFIED |
 Nelson Precast Products, LLC | Baltimore | MD | — | ◇ UNVERIFIED |
