| MCMishawaka Concrete & Asphalt Recycling | Mccook | — | ◇ UNVERIFIED |
 Mississippi Lime CO | Prairie Du Rocher | — | ◇ UNVERIFIED |
| MCMoline Consumers CO - R/m Concrete Div | Moline | — | ◇ UNVERIFIED |
| MPMt Pulaski Products LLC | Mount Pulaski | — | ◇ UNVERIFIED |
| NRNaperville Ready Mix INC | Naperville | — | ◇ UNVERIFIED |
| NBNarvick Brothers Lumber CO INC | Channahon | — | ◇ UNVERIFIED |
| NBNarvick Brothers Lumber CO INC | Morris | — | ◇ UNVERIFIED |
| NBNarvick Brothers Lumber CO INC | Yorkville | — | ◇ UNVERIFIED |
| NINorthern Il Wilbert Vault CO INC | Belvidere | — | ◇ UNVERIFIED |
| NMNorthern Materials | Lakewood | — | ◇ UNVERIFIED |
| NBNorthfield Block CO | Channahon | — | ◇ UNVERIFIED |
| NBNorthfield Block CO | Joliet | — | ◇ UNVERIFIED |
| NBNorthfield Block Company | Elgin | — | ◇ UNVERIFIED |
| NBNorthfield Block INC | Romeoville | — | ◇ UNVERIFIED |
| NMNorthfield Mundelein Plant | Mundelein | — | ◇ UNVERIFIED |
| NINorthwest Illinois Construction CO | Rock Falls | — | ◇ UNVERIFIED |
| NCNorthwind Concrete Products CO | Posen | — | ◇ UNVERIFIED |
| NCNorthwind Concrete Products CO | South Beloit | — | ◇ UNVERIFIED |
| OMOremus Material LLC | Chicago | — | ◇ UNVERIFIED |
| OBOzinga Bros INC | Joliet | — | ◇ UNVERIFIED |
| OCOzinga Concrete Products - Hampshire | Hampshire | — | ◇ UNVERIFIED |
| OCOzinga Concrete Products Huntley | Huntley | — | ◇ UNVERIFIED |
| OIOzinga Illinois Rmc INC | Elgin | — | ◇ UNVERIFIED |
| OIOzinga Illinois Rmc INC | Monee | — | ◇ UNVERIFIED |
| OROzinga Ready Mix | Naperville | — | ◇ UNVERIFIED |
| OROzinga Ready Mix | Chicago Heights | — | ◇ UNVERIFIED |
| OROzinga Ready Mix - 103rd St Plant | Chicago | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete INC | Aurora | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete INC | Carol Stream | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete INC | Calumet Park | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Concrete - Monee | Monee | — | ◇ UNVERIFIED |
| PPaschen-newberg-foster | Chicago | — | ◇ UNVERIFIED |
| PRPaxton Ready Mix INC | Paxton | — | ◇ UNVERIFIED |
| PCPbm Concrete INC | Rochelle | — | ◇ UNVERIFIED |
| PGPeltier Glass Site | Ottawa | — | ◇ UNVERIFIED |
| PMPerformance Minerals CORP | Chicago | — | ◇ UNVERIFIED |
| PIPermacor INC | Oak Lawn | — | ◇ UNVERIFIED |
| PCPlote Construction | North Aurora | — | ◇ UNVERIFIED |
| PCPlote Construction INC | West Chicago | — | ◇ UNVERIFIED |
| PCPlote Construction INC | East Dundee | — | ◇ UNVERIFIED |
| PCPlote Construction INC | Waukegan | — | ◇ UNVERIFIED |
| PCPlote Construction INC | Hoffman Estates | — | ◇ UNVERIFIED |
| PRPoggenpohl Redi-mix | Morrisonville | — | ◇ UNVERIFIED |
| PRPoggenpohl Redi-mix | Taylorville | — | ◇ UNVERIFIED |
| PRPoint Ready Mix LLC | Hampshire | — | ◇ UNVERIFIED |
| PPPorcelain Products CO | Macomb | — | ◇ UNVERIFIED |
| PMPrairie Material Sales | Romeoville | — | ◇ UNVERIFIED |
| PMPrairie Material Sales INC | Naperville | — | ◇ UNVERIFIED |
| PMPrairie Material Sales INC | Bolingbrook | — | ◇ UNVERIFIED |
| PMPrairie Material Sales - Plant 2 | Chicago | — | ◇ UNVERIFIED |
