| MRMckees Rocks Transfer Station | Mc Kees Rocks | PA | — | ◇ UNVERIFIED |
| MMMc Materials 62 - Mountain View | Mountain View | MO | — | ◇ UNVERIFIED |
| MMMc Materials Plant 63 - Summersville | Summersville | MO | — | ◇ UNVERIFIED |
| MMMc Materials Plant 64 - Winona | Winona | MO | — | ◇ UNVERIFIED |
| MCMcminnville Concrete | Mcminnville | OR | — | ◇ UNVERIFIED |
| MCMcpherson Concrete | Mcpherson | KS | — | ◇ UNVERIFIED |
 Meadow Burke, LLC. | Tampa | FL | — | ◇ UNVERIFIED |
| MRMeadville Redi Mix I/rt 322 | Meadville | PA | — | ◇ UNVERIFIED |
| MCMechanicsville Concrete Llc-airport Plant (portugee Road) | Sandston | VA | — | ◇ UNVERIFIED |
| MSMedina Supply North Ridgeville Plant 500 | North Ridgeville | OH | — | ◇ UNVERIFIED |
| MSMeeker Sand & Gravel INC | Meeker | CO | — | ◇ UNVERIFIED |
| MPMelissa Plant | Melissa | TX | — | ◇ UNVERIFIED |
| MRMemphis Ready Mix Malone Road Plant Dba Buzzi Unicem Ready Mix, LLC | Memphis | TN | — | ◇ UNVERIFIED |
| MVMercer Vault Company | Fredericksburg | VA | — | ◇ UNVERIFIED |
| MGMertel Gravel CO | Peru | IL | — | ◇ UNVERIFIED |
| MFMetal Finishing Research CORP | Chicago | IL | — | ◇ UNVERIFIED |
| MMetalico-evans | Atlanta | GA | — | ◇ UNVERIFIED |
| MCMetokote Corporation | Sanford | NC | — | ◇ UNVERIFIED |
| MCMetro Concrete LLC | Biloxi | MS | — | ◇ UNVERIFIED |
| MIMetrocon INC | Central | SC | — | ◇ UNVERIFIED |
| MIMetrocon INC | Travelers Rest | SC | — | ◇ UNVERIFIED |
| MIMetrocon Inman Plant | Inman | SC | — | ◇ UNVERIFIED |
| MMMetro Materials Concrete Batch Plant | Valley Park | MO | — | ◇ UNVERIFIED |
| MMMetro Materials - Hanley Plant-kinloch | Kinloch | MO | — | ◇ UNVERIFIED |
| MMMetro Materials, INC. - Malone Road | Memphis | TN | — | ◇ UNVERIFIED |
| MMMetro Materials (valley Park Plant)-fenton Supply Company | Valley Park | MO | — | ◇ UNVERIFIED |
| MMMetro Mix LLC | Denver | CO | — | ◇ UNVERIFIED |
| MCMetromont Corporation | Charlotte | NC | — | ◇ UNVERIFIED |
| MLMetromont LLC - Richmond Plant | Richmond | VA | — | ◇ UNVERIFIED |
| MMMetromont Materials | Charlotte | NC | — | ◇ UNVERIFIED |
| MMMetromont Materials Corporation | Marion | NC | — | ◇ UNVERIFIED |
| MMMetromont Materials Corporation Belton | Anderson | SC | — | ◇ UNVERIFIED |
| MMMetromont Materials Corporation - Concord Plt | Concord | NC | — | ◇ UNVERIFIED |
| MMMetromont Materials Corporation - Indian Trail Plant | Indian Trail | NC | — | ◇ UNVERIFIED |
| MMMetromont Materials Corporation Richburg | Richburg | SC | — | ◇ UNVERIFIED |
| MPMetromont Prestress Company | Charlotte | NC | — | ◇ UNVERIFIED |
| MRMetro Ready Mix Concrete, INC. | Nashville | TN | — | ◇ UNVERIFIED |
| MCMeuth Construction Supply INC - Hopkinsville Plant | Hopkinsville | KY | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Belvidere | IL | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Northbrook | IL | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Harvard | IL | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Mchenry | IL | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Marengo | IL | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Huntley | IL | — | ◇ UNVERIFIED |
| MMMeyer Material CO Kenosha 20 | Kenosha | WI | — | ◇ UNVERIFIED |
| MMMeyer Material CO Kenosha 40 | Kenosha | WI | — | ◇ UNVERIFIED |
| MMMeyer Material CO Middlebury Ready Mix Plant | Middlebury | IN | — | ◇ UNVERIFIED |
| MMMeyer Material Company | Milwaukee | WI | — | ◇ UNVERIFIED |
| MMMeyer Material CO Warsaw Ready Mix Plant | Warsaw | IN | — | ◇ UNVERIFIED |
| MPMiami Products & Chemical CO. | Dayton | OH | — | ◇ UNVERIFIED |
| MAMid America Redi Mix - Hutchinson Plant | South Hutchinson | KS | — | ◇ UNVERIFIED |
| MHMid Hudson Concrete | Cold Spring | NY | — | ◇ UNVERIFIED |
| MIMid Il Concrete INC Dba Clark County Ready Mix | Martinsville | IL | — | ◇ UNVERIFIED |
| MIMid Illinois Concrete - Effingham Ready Mix | Effingham | IL | — | ◇ UNVERIFIED |
| MCMid-illinois Concrete INC | Effingham | IL | — | ◇ UNVERIFIED |
| MSMidland South Plant | Midland | TX | — | ◇ UNVERIFIED |
| MPMidlothian Plant | Midlothian | TX | — | ◇ UNVERIFIED |
| MMMid-way Materials, INC. | Mckenzie | TN | — | ◇ UNVERIFIED |
| MCMidwest Concrete - Abilene #2 (swpp) | Abilene | KS | — | ◇ UNVERIFIED |
| MCMidwest Concrete - Charlson Road (swpp) | Manhattan | KS | — | ◇ UNVERIFIED |
| MCMidwest Concrete-junction City Ready Mix (swpp) | Junction City | KS | — | ◇ UNVERIFIED |
| MCMidwest Concrete Materials - Forbes Field Concrete Plant (water) | Topeka | KS | — | ◇ UNVERIFIED |
| MCMidwest Concrete Materials - Manhattan | Manhattan | KS | — | ◇ UNVERIFIED |
| MCMidwest Concrete Materials - New Strawn Ready Mix Plant (water) | New Strawn | KS | — | ◇ UNVERIFIED |
| MCMidwest Concrete - Perry (swpp) | Perry | KS | — | ◇ UNVERIFIED |
| MCMidwest Concrete - Plant #11-man Rm (portable)(air) | Portable | KS | — | ◇ UNVERIFIED |
| MCMidwest Concrete -plant #8-airport Rm (portable)(air) | Portable | KS | — | ◇ UNVERIFIED |
| MCMidwest Concrete - Wamego | Wamego | KS | — | ◇ UNVERIFIED |
| MMMidwest Minerals (master Equip List)(air) | Pittsburg | KS | — | ◇ UNVERIFIED |
| MPMidwest Products-clay Center (new) | Clay Center | KS | — | ◇ UNVERIFIED |
| MRMidwest Ready Mix | Vermillion | SD | — | ◇ UNVERIFIED |
| MRMillers Ready-mix LLC | South Chicago Heights | IL | — | ◇ UNVERIFIED |
| MRMilligan Ready Mix | Iuka | MS | — | ◇ UNVERIFIED |
| MBMillstone Bangert Inc-chesterfield (mbi #6) | Chesterfield | MO | — | ◇ UNVERIFIED |
| MWMillstone Weber - Concrete Plant #7001 | Denver | CO | — | ◇ UNVERIFIED |
| MRMineral Right, INC. Environmental Manager | Phillipsburg | KS | — | ◇ UNVERIFIED |
| MIMinnick Illinois LLC | Joliet | IL | — | ◇ UNVERIFIED |
| MPMiramar Plant 33 | San Diego | CA | — | ◇ UNVERIFIED |
| MPMirandy Products LLC | South Hempstead | NY | — | ◇ UNVERIFIED |
| MEMissouri Electrochem Incorporated | Saint Louis | MO | — | ◇ UNVERIFIED |
| MCMitchell Concrete INC. | Mitchell | SD | — | ◇ UNVERIFIED |
| MMMix Masters Concrete, INC. | Beulaville | NC | — | ◇ UNVERIFIED |
| MCMm Cleburne Ready Mix | Cleburne | TX | — | ◇ UNVERIFIED |
 Mmc Materials Gulf Coast - Crestview Plant | Crestview | FL | — | ◇ UNVERIFIED |
| Mmc Materials Gulf Coast - Ft Walton Beach Plant | Fort Walton Beach | FL | — | ◇ UNVERIFIED |
| Mmc Materials Gulf Coast - Pensacola Plant | Pensacola | FL | — | ◇ UNVERIFIED |
| Mmc Materials Gulf Coast - Point Washington Plant | Point Washington | FL | — | ◇ UNVERIFIED |
| Mmc Materials Gulf Coast - Port St. Joe Plant | Port Saint Joe | FL | — | ◇ UNVERIFIED |
| MMMmc Materials INC | Robinsonville | MS | — | ◇ UNVERIFIED |
| MMMmc Materials INC | Madison | MS | — | ◇ UNVERIFIED |
 Mmc Materials INC. | Hartford | AL | — | ◇ UNVERIFIED |
| Mmc Materials, INC. | Greenville | AL | — | ◇ UNVERIFIED |
| Mmc Materials Inc, Brookhaven | Brookhaven | MS | — | ◇ UNVERIFIED |
| MMMmc Materials Inc, Calhoun City | Calhoun City | MS | — | ◇ UNVERIFIED |
| MMMmc Materials Inc, Carthage | Carthage | MS | — | ◇ UNVERIFIED |
| Mmc Materials Inc, Clarksdale Plant | Clarksdale | MS | — | ◇ UNVERIFIED |
| Mmc Materials INC - Cleveland | Cleveland | MS | — | ◇ UNVERIFIED |
| MMMmc Materials Inc, Clinton Plant | Clinton | MS | — | ◇ UNVERIFIED |
| MMMmc Materials, INC. - Collierville | Collierville | TN | — | ◇ UNVERIFIED |
| Mmc Materials Inc, Cordova Plant | Byhalia | MS | — | ◇ UNVERIFIED |
