| NCNorthwest Concrete Products INC | Roseau | MN | — | ◇ UNVERIFIED |
| NRNorthwest Ready Mix, INC. | Astoria | OR | — | ◇ UNVERIFIED |
| NRNorwalk Ready Mix Concrete INC | Indianola | IA | — | ◇ UNVERIFIED |
| NRNorwalk Ready Mixed Concrete INC. - Desoto | De Soto | IA | — | ◇ UNVERIFIED |
| NPNotus Pit | Caldwell | ID | — | ◇ UNVERIFIED |
| NBNova Brik Midamerica Llc-sikeston | Sikeston | MO | — | ◇ UNVERIFIED |
| NCNuvo Construction Company, INC. | Milwaukee | WI | — | ◇ UNVERIFIED |
| OROakland Ready Mix Company | Oakland | CA | — | ◇ UNVERIFIED |
| ODOberfields - Delaware, Oh Masonry Plant | Delaware | OH | — | ◇ UNVERIFIED |
| OCOberlin Concrete | Oberlin | KS | — | ◇ UNVERIFIED |
| ORO'brien Ready Mix - Chanute Plant | Chanute | KS | — | ◇ UNVERIFIED |
| ORO'brien Ready Mix - Fort Scott Plant | Fort Scott | KS | — | ◇ UNVERIFIED |
| ORO'brien Ready Mix - Frontenac Plant | Frontenac | KS | — | ◇ UNVERIFIED |
| ORObrien Rock Co., INC. | Frontenac | KS | — | ◇ UNVERIFIED |
| ORObrien Rock Co., INC. (see 7770486) | Dexter | KS | — | ◇ UNVERIFIED |
| ORObrien Rock - Galena | Galena | KS | — | ◇ UNVERIFIED |
| OCObt Concrete Batch Plant | Orlando | FL | — | ◇ UNVERIFIED |
| OROceanside Rmc Plant | Oceanside | CA | — | ◇ UNVERIFIED |
| OCOconee Concrete Company, INC. | Phenix City | AL | — | ◇ UNVERIFIED |
| OCOconee Concrete Company, INC. | Opelika | AL | — | ◇ UNVERIFIED |
| ODO Daniel Trucking CO | Grayville | IL | — | ◇ UNVERIFIED |
| OCOdum Concrete Products INC | Marion | IL | — | ◇ UNVERIFIED |
| OCOdum Concrete Products INC | Herrin | IL | — | ◇ UNVERIFIED |
| OCOdum Concrete Products INC | Benton | IL | — | ◇ UNVERIFIED |
| OCOdum Concrete Products INC | West Frankfort | IL | — | ◇ UNVERIFIED |
| OROhio River Concrete CORP | Marion | KY | — | ◇ UNVERIFIED |
| OAOkeechobee Asphalt/concrete Plant, Cw Roberts Contracting INC. | Okeechobee | FL | — | ◇ UNVERIFIED |
| OAOldcastle Adams Products - Ridgeway | Ridgeway | SC | — | ◇ UNVERIFIED |
| OAOldcastle Apg - Loveland | Loveland | CO | — | ◇ UNVERIFIED |
| OAOldcastle Apg Natl I/emigsville | Emigsville | PA | — | ◇ UNVERIFIED |
| OAOldcastle Apg New England | Holbrook | MA | — | ◇ UNVERIFIED |
| OAOldcastle Apg Northeast INC. | Fishers | NY | — | ◇ UNVERIFIED |
| OAOldcastle Apg Northeast, INC. | Odenton | MD | — | ◇ UNVERIFIED |
| OAOldcastle Apg South INC | Rockwood | TN | — | ◇ UNVERIFIED |
| OAOldcastle Apg South, INC | Lehigh Acres | FL | — | ◇ UNVERIFIED |
| OAOldcastle Apg South, INC. | Auburndale | FL | — | ◇ UNVERIFIED |
| OAOldcastle Apg South, INC. | Montgomery | AL | — | ◇ UNVERIFIED |
| OAOldcastle Apg South, INC. Dba Adams Products | Greensboro | NC | — | ◇ UNVERIFIED |
| OAOldcastle Apg Texas INC (dba Custom-crete) | Frisco | TX | — | ◇ UNVERIFIED |
| OAOldcastle Apg West/dba Superlite Block | Needles | CA | — | ◇ UNVERIFIED |
| OAOldcastle Architectural West | North Salt Lake | UT | — | ◇ UNVERIFIED |
| OAOldcastle Architectural West INC | Keller | TX | — | ◇ UNVERIFIED |
| OAOldcastle Architectural West INC | Balch Springs | TX | — | ◇ UNVERIFIED |
| OAOldcastle Architectural West INC | Houston | TX | — | ◇ UNVERIFIED |
| OCOldcastle Coastal INC | Fort Myers | FL | — | ◇ UNVERIFIED |
| OCOld Castle Dba United - Two Feathers Pit | Montrose | CO | — | ◇ UNVERIFIED |
| OEOldcastle Enclosure Solutions | Tracy | CA | — | ◇ UNVERIFIED |
| OIOldcastle, INC. | Leesburg | VA | — | ◇ UNVERIFIED |
| OCOld Castle INC 4d | Midland | MI | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure | Stockton | CA | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure INC | Chowchilla | CA | — | ◇ UNVERIFIED |
| OMOldcastle Materials, INC. | Tampa | FL | — | ◇ UNVERIFIED |
| OMOldcastle Materials, INC. | Gainesville | FL | — | ◇ UNVERIFIED |
| OMOldcastle Miller Bonner Springs | Bonner Springs | KS | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Easton | PA | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Fontana | CA | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Folsom | NJ | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Greensboro | NC | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Morrisville | PA | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| OPOldcastle Precast Pipe | Folsom | NJ | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group - 1771 Shields Dr | Steamboat Springs | CO | — | ◇ UNVERIFIED |
| 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 | 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 | Pagosa Springs | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group INC. Dba Four Corners | Cortez | CO | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group INC. Dba Four Corners | Durango 4.1 Mi. N of | 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 |
| OPOlsen Pavingstone INC | San Juan Capistrano | CA | — | ◇ UNVERIFIED |
| OSOltman & Sons INC | Henry | IL | — | ◇ UNVERIFIED |
| OPOlympian Precast INC | Redmond | WA | — | ◇ UNVERIFIED |
| OPOneonta Plant | Oneonta | AL | — | ◇ 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 |
| OPOrange Pavers LLC | Stroudsburg | PA | — | ◇ UNVERIFIED |
| OBOrco Block CO | Oceanside | CA | — | ◇ UNVERIFIED |
| OBOrco Block CO INC | Banning | CA | — | ◇ UNVERIFIED |
| OBOrco Block CO INC | Riverside | CA | — | ◇ UNVERIFIED |
| OBOrco Block CO INC | Stanton | CA | — | ◇ UNVERIFIED |
| OBOrco Block & Hardscape | Oceanside | CA | — | ◇ UNVERIFIED |
| OBOrco Block & Hardscape | Riverside | CA | — | ◇ UNVERIFIED |
| ODOre Design North Salt Lake Assembly Facility | North Salt Lake | UT | — | ◇ UNVERIFIED |
| ODOre Designs INC | Woods Cross | UT | — | ◇ UNVERIFIED |
| OBOregon Block and Paver Manufacturing INC | Prineville | OR | — | ◇ 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 |
| OAOrlando Airport | Orlando | FL | — | ◇ UNVERIFIED |
| OCOrnamental Concrete INC | Arvada | CO | — | ◇ UNVERIFIED |
| OCOsage County Industries | Linn | MO | — | ◇ UNVERIFIED |
| OCOsage County Industries Inc-linn | Linn | MO | — | ◇ UNVERIFIED |