| OSOldcastle Sw Group - Anderson Rmc | Delta | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group Dba Telluride Gravel | Telluride | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group, INC. Dba B&b Excavat | Eagle | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group, INC. Dba B&b Excavat | 0.5 Miles West of Edwardsq | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group INC Dba Four Corners | Pagosa Springs | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group INC. Dba Four Corners | Durango 4.1 Mi. N of | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group INC. Dba Four Corners | Cortez | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group INC Dba United CO of | Paonia | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group - Minturn Concrete | Minturn | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group - Rifle Rmc Plant | Rifle | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Grp - Gunnison Redi-mix Pit | Gunnison Area | CO | — | ◇ UNVERIFIED |
| OUOldcastle United Comp of Mesa County | Rifle | CO | — | ◇ UNVERIFIED |
| OMOld Metro Parkway Concrete Plant | Fort Myers | FL | — | ◇ UNVERIFIED |
| OROlein Recovery CORP | Yabucoa | PR | — | ◇ UNVERIFIED |
| OSOltman & Sons INC | Henry | IL | — | ◇ UNVERIFIED |
| OHOmega Henderson Terminal | Henderson | KY | — | ◇ UNVERIFIED |
| OPOneonta Plant | Oneonta | AL | — | ◇ UNVERIFIED |
| O7Ontario 76 | Ontario | CA | — | ◇ UNVERIFIED |
| OROrangeburg Redi-mix Concrete | Orangeburg | SC | — | ◇ UNVERIFIED |
| OROrangeburg Redi-mix Concrete INC Bamberg Plant | Bamberg | SC | — | ◇ UNVERIFIED |
| OROrangeburg Redi-mix Concrete INC Harleyville | Harleyville | SC | — | ◇ UNVERIFIED |
| OBOrco Block CO | Oceanside | CA | — | ◇ UNVERIFIED |
| OOOregon On-site Concrete INC | Sherwood | OR | — | ◇ UNVERIFIED |
| OMOremus Material LLC | Chicago | IL | — | ◇ UNVERIFIED |
| OROrgain Ready Mix Concrete Co., INC. | Murfreesboro | TN | — | ◇ UNVERIFIED |
| OROrgain Ready Mix Concrete Company, INC. | Pleasant View | TN | — | ◇ UNVERIFIED |
| OBOrigin Baltimore Recycling, LLC | Curtis Bay | MD | — | ◇ UNVERIFIED |
| OAOrlando Airport | Orlando | FL | — | ◇ UNVERIFIED |
| OCOsage County Industries | Linn | MO | — | ◇ UNVERIFIED |
| OCOsage County Industries Inc-linn | Linn | MO | — | ◇ UNVERIFIED |
| OCOsborne Concrete & Stone CO (0243030583) | Grand River | OH | — | ◇ UNVERIFIED |
| OIOsborne INC | Mentor | OH | — | ◇ UNVERIFIED |
| OROscar Renda Contracting, INC. | Houston | TX | — | ◇ UNVERIFIED |
| OCOsceola Concrete LLC | Osceola | MO | — | ◇ UNVERIFIED |
| O0Otfl 001 Eastside Ready Mix379 | San Antonio | TX | — | ◇ UNVERIFIED |
| OIOutback Inc.-oneals Yard | O'neals | CA | — | ◇ UNVERIFIED |
| OMOutback Materials | Fresno | CA | — | ◇ UNVERIFIED |
| OMOutback Materials | Mariposa | CA | — | ◇ UNVERIFIED |
| OMOutback Materials, INC. | O'neals | CA | — | ◇ UNVERIFIED |
| OROverland Ready Mixed Concrete | Strang | NE | — | ◇ UNVERIFIED |
| OROverland Ready Mixed Super 8 | Fullerton | NE | — | ◇ UNVERIFIED |
| OSOverland Sand & Gravel Mowitz | Central City | NE | — | ◇ UNVERIFIED |
| OSOverton Sand & Gravel CO | Lexington | NE | — | ◇ UNVERIFIED |
| OSOverton Sand & Gravel CO. | Riverdale | NE | — | ◇ UNVERIFIED |
| OSOverton Sand & Gravel Company | Overton | NE | — | ◇ UNVERIFIED |
| OCOwensboro Concrete CO | Owensboro | KY | — | ◇ UNVERIFIED |
| OBOwens Brothers Concrete CO | Arvada | CO | — | ◇ UNVERIFIED |
| ODOxford Division of B and B Concrete Company INC | Oxford | MS | — | ◇ UNVERIFIED |
| OSOxford Sand Company Inc, Pontotoc Plant | Pontotoc | MS | — | ◇ UNVERIFIED |
| OSOxford Sand Company Inc, Pontotoc Plant | Ecru | MS | — | ◇ UNVERIFIED |
| OBOxnard Building Materials | Oxnard | CA | — | ◇ UNVERIFIED |
| OOOxy Occidental Petroleum Corporation | Denver | CO | — | ◇ UNVERIFIED |
| OBOzark Building Materials, LLC Plant 1 | Saint Louis | MO | — | ◇ UNVERIFIED |
| OBOzark Building Materials-plant 6 | Maryland Heights | MO | — | ◇ UNVERIFIED |
| OROzark Ready Mix | Eldon | MO | — | ◇ UNVERIFIED |
| OROzark Ready Mix CO Inc-eldon - Plant 1 | Eldon | MO | — | ◇ UNVERIFIED |
| OROzark Ready Mix CO Inc-plant #2 Osage Beach | Osage Beach | MO | — | ◇ UNVERIFIED |
| OROzark Ready Mix Company, INC. | Lebanon | MO | — | ◇ UNVERIFIED |
| OROzark Ready Mix - Dba Promix Concrete | Lowell | AR | — | ◇ UNVERIFIED |
| OROzark Ready Mix - Eldon | Eldon | MO | — | ◇ UNVERIFIED |
| OROzark Ready Mix Kc - Paola, Kansas | Paola | KS | — | ◇ UNVERIFIED |
| OROzark Ready Mix - Linn Creek | Linn Creek | MO | — | ◇ UNVERIFIED |
| OROzark Ready Mix - Portable Heartland Cola Facility (stormwater) | Olathe | KS | — | ◇ UNVERIFIED |
| OROzark Ready Mix - Sunrise Beach | Sunrise Beach | MO | — | ◇ UNVERIFIED |
| OROzark Ready Mix - Versailles | Versailles | MO | — | ◇ UNVERIFIED |
| OROzark Ready Mix - Waynesville | Saint Robert | MO | — | ◇ UNVERIFIED |
| OROzark Ready Mix-waynesville | Waynesville | MO | — | ◇ UNVERIFIED |
| OBOzinga Bros | Forest View | IL | — | ◇ UNVERIFIED |
| OBOzinga Bros INC | Joliet | IL | — | ◇ UNVERIFIED |
| OBOzinga Bros INC | Milan | IL | — | ◇ UNVERIFIED |
| OBOzinga Bros INC | Watseka | IL | — | ◇ UNVERIFIED |
| OBOzinga Bros INC | Downers Grove | IL | — | ◇ UNVERIFIED |
| OBOzinga Bros INC | Grant Park | IL | — | ◇ UNVERIFIED |
| OBOzinga Bros Inc-holiday Hills Plant | Holiday Hills | IL | — | ◇ UNVERIFIED |
| OBOzinga Brothers, INC. | Alsip | IL | — | ◇ UNVERIFIED |
| OCOzinga Chicago Rmc INC | Chicago | IL | — | ◇ UNVERIFIED |
| OCOzinga Concrete | Rockford | IL | — | ◇ UNVERIFIED |
| OCOzinga Concrete Products - Hampshire | Hampshire | IL | — | ◇ UNVERIFIED |
| OCOzinga Concrete Products Huntley | Huntley | IL | — | ◇ UNVERIFIED |
| OIOzinga Illinois Rmc | Dekalb | IL | — | ◇ UNVERIFIED |
| OIOzinga Illinois Rmc INC | Mokena | IL | — | ◇ UNVERIFIED |
| OIOzinga Illinois Rmc INC | Monee | IL | — | ◇ UNVERIFIED |
| OIOzinga Illinois Rmc INC | Blue Island | IL | — | ◇ UNVERIFIED |
| OIOzinga Illinois Rmc INC | Elgin | IL | — | ◇ UNVERIFIED |
| OMOzinga - Miami Plant | Miami | FL | — | ◇ UNVERIFIED |
| OROzinga Ready Mix | Naperville | IL | — | ◇ UNVERIFIED |
| OROzinga Ready Mix | Chicago Heights | IL | — | ◇ UNVERIFIED |
| OROzinga Ready Mix - 103rd St Plant | Chicago | IL | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Burlington | Burlington | WI | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Concrete Beloit | Beloit | WI | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Concrete Hartland | Hartland | WI | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete INC | Cherry Valley | IL | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete INC | Aurora | IL | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete INC | Mchenry | IL | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete INC | Carol Stream | IL | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete, INC. | Milwaukee | WI | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Concrete INC | Wilmington | IL | — | ◇ UNVERIFIED |
| OROzinga Ready Mix Concrete INC - Manteno | Manteno | IL | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Concrete - Laporte | La Porte | IN | — | ◇ UNVERIFIED |
| OROzinga Ready-mix Concrete Plymouth | Plymouth | IN | — | ◇ UNVERIFIED |