| OSOdonnell & Sons Const. (asphalt Plant) (portable) | Portable | KS | — | ◇ UNVERIFIED |
| OAOgden Avenue Materials INC | Chicago | IL | — | ◇ UNVERIFIED |
| OGO & G Industries, INC | New Milford | CT | — | ◇ UNVERIFIED |
| OIO&g Industries INC Beacon Falls | Beacon Falls | CT | — | ◇ UNVERIFIED |
| OCO'hare Concrete Plant | Chicago | IL | — | ◇ UNVERIFIED |
| OSOil Spill (blacklidge Emulsions,, Inc.) | Gulfport | MS | — | ◇ UNVERIFIED |
| OAOlathe Aggregate Facilities (stormwater) | Olathe | KS | — | ◇ UNVERIFIED |
| OOldcastle | Morgan Hill | CA | — | ◇ UNVERIFIED |
| OOldcastle | Kenosha | WI | — | ◇ UNVERIFIED |
| OOldcastle | Elgin | IL | — | ◇ UNVERIFIED |
| OOldcastle | Lockport | IL | — | ◇ UNVERIFIED |
| OAOldcastle Adams Products | Clarksville | TN | — | ◇ UNVERIFIED |
| OAOldcastle Apg Company, Great Lakes | Cincinnati | OH | — | ◇ UNVERIFIED |
| OAOldcastle Apg Mid-atlantic | Chesapeake | VA | — | ◇ UNVERIFIED |
| OAOldcastle Apg Mid-atlantic Crofton, Md | Odenton | MD | — | ◇ UNVERIFIED |
| OAOldcastle Apg Mid-atlantic Richmond, Va | Richmond | VA | — | ◇ UNVERIFIED |
| OAOldcastle Apg Natl I/emigsville | Emigsville | PA | — | ◇ UNVERIFIED |
| OAOldcastle Apg New England | Victor | NY | — | ◇ UNVERIFIED |
| OAOldcastle Apg New England | Cranston | RI | — | ◇ UNVERIFIED |
| OAOldcastle Apg Northeast, INC. | Manheim | PA | — | ◇ UNVERIFIED |
| OAOldcastle Apg Northeast, INC. | West Lebanon | NH | — | ◇ UNVERIFIED |
| OAOldcastle Architectural West INC | Dallas | TX | — | ◇ UNVERIFIED |
| OAOldcastle Architectural West INC | Austin | TX | — | ◇ UNVERIFIED |
| OAOldcastle Architectural West INC | Rosenberg | TX | — | ◇ UNVERIFIED |
| OCOldcastle - Crested Butte Rmc Plant | Crested Butte Area | CO | — | ◇ UNVERIFIED |
| OCOld Castle Dba United - Two Feathers Pit | Montrose | CO | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure | Platteville | CO | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure | Acworth | GA | — | ◇ UNVERIFIED |
 Oldcastle Infrastructure INC. - Courtland | Courtland | MN | — | ◇ UNVERIFIED |
| OMOldcastle Matt Stone Holdings Incorporated | Cowpens | SC | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Mansfield | TX | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Lakeside | CA | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Houston | TX | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Kalamazoo | MI | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Easton | PA | — | ◇ UNVERIFIED |
| OPOldcastle Precast Brookshire Plant | Brookshire | TX | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Medley | FL | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Chandler | AZ | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Folsom | NJ | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Greensboro | NC | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Manchester | NY | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Bartow | FL | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Morrisville | PA | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC. | Edgewood | MD | — | ◇ UNVERIFIED |
| OPOldcastle Precast, INC. - Bellingham | Bellingham | WA | — | ◇ UNVERIFIED |
| OPOldcastle Precast, INC. - Jacksonvillesp | Jacksonville | FL | — | ◇ UNVERIFIED |
| OPOldcastle Precast, INC. - Tallahasseesp | Midway | FL | — | ◇ UNVERIFIED |
| OPOldcastle Precast San Antonio Plant | San Antonio | TX | — | ◇ UNVERIFIED |
| OROldcastle Retail, INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group - 1771 Shields Dr | Steamboat Springs | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group - Cugnini Pit | Durango | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group Dba B&b Excavating | Eagle | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group Dba Four Conrners | Durango 2.5 Mi Se of | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group Dba United Companies | Norwood | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group Dba United CO of Mesa | Rifle | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group Dba United CO of Mesa | Montrose | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group, INC. Dba B&b Excavat | 0.5 Miles West of Edwardsq | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group, INC. Dba B&b Excavat | Eagle | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group INC. Dba Four Corners | Cortez | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group- Port Concrete Plant | Gunnison | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group- Tri County Pit | Hotchkiss | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group - Wattenberg West | Brighton, 2.0 Mi Nw of | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Grp - Gunnison Redi-mix Pit | Gunnison | CO | — | ◇ UNVERIFIED |
| OIOlipdp Ii LLC - Mggt-gl Production Facility | Vinton | LA | — | ◇ UNVERIFIED |
| OPOlympian Precast INC | Redmond | WA | — | ◇ UNVERIFIED |
| OCOmans Contracting INC | Hesperia | MI | — | ◇ UNVERIFIED |
| OPOmega Products International | Sacramento | CA | — | ◇ UNVERIFIED |
| OPOmega Products International, INC. | Commerce City | CO | — | ◇ UNVERIFIED |
| OMOmg Midwest Dba Cessford Construction CO | Burlington | IA | — | ◇ UNVERIFIED |
| OMOmg Midwest INC | Johnston | IA | — | ◇ UNVERIFIED |
| OEOmni Engineering Plant 02 | Omaha | NE | — | ◇ UNVERIFIED |
| OEOmni Engineering Plant 02 | Omaha | NE | — | ◇ UNVERIFIED |
| OBOneonta Block CO | Oneonta | NY | — | ◇ UNVERIFIED |
| OPOneonta Plant | Oneonta | AL | — | ◇ UNVERIFIED |
| OROpen Road Asphalt CO LLC | Marshall | IL | — | ◇ UNVERIFIED |
| OROpen Road Asphalt CO. LLC - Fairmount | Fairmount | IL | — | ◇ UNVERIFIED |
| OROpen Road Asphalt Company LLC | Paxton | IL | — | ◇ UNVERIFIED |
| OCOrange Crush LLC | Wheeling | IL | — | ◇ UNVERIFIED |
| OCOrange Crush LLC | Des Plaines | IL | — | ◇ UNVERIFIED |
| OCOrange Crush LLC | Skokie | IL | — | ◇ UNVERIFIED |
| OCOrange Crush LLC | East Dundee | IL | — | ◇ UNVERIFIED |
| OPOrchard Park Plant | Orchard Park | NY | — | ◇ UNVERIFIED |
| ODOre Design North Salt Lake Assembly Facility | North Salt Lake | UT | — | ◇ UNVERIFIED |
| ODOre Designs INC | Woods Cross | UT | — | ◇ UNVERIFIED |
| OMOremus Material LLC | Chicago | IL | — | ◇ UNVERIFIED |
| OROrgain Ready Mix Concrete Co., INC. | Murfreesboro | TN | — | ◇ UNVERIFIED |
| OROrgain Ready Mix Concrete Co., INC. | Clarksville | TN | — | ◇ UNVERIFIED |
| OSOriental Sand & Gravel | Yabucoa | PR | — | ◇ UNVERIFIED |
| OOriskany | Oriskany | NY | — | ◇ UNVERIFIED |
| OPOrlando Paving Company | Oviedo | FL | — | ◇ UNVERIFIED |
| OPOrlando Paving Company | Orlando | FL | — | ◇ UNVERIFIED |
| OPOrlando Paving Company | Apopka | FL | — | ◇ UNVERIFIED |
| OPOrlando Paving Plant #11 | Orlando | FL | — | ◇ UNVERIFIED |
| OPOrlando Paving Plant #5 | Apopka | FL | — | ◇ UNVERIFIED |
| OROrosi Rock LLC | Orosi | CA | — | ◇ UNVERIFIED |
| OCOsage County Industries Inc-linn | Linn | MO | — | ◇ UNVERIFIED |
| OCOsborne Co., LTD. | Valley View | OH | — | ◇ UNVERIFIED |
| OIOsborne INC. | Cleveland | OH | — | ◇ UNVERIFIED |
| OROscar Renda Contracting, Biloxi North Facility | Biloxi | MS | — | ◇ UNVERIFIED |
