 Nelson Precast Products, LLC | Towson | MD | — | ◇ UNVERIFIED |
| NCNeosho Concrete Products Company | Neosho | MO | — | ◇ UNVERIFIED |
| NBNew Bethlehem Burial Services, INC. | New Bethlehem | PA | — | ◇ UNVERIFIED |
| NPNewcastle Precast LLC | Portland | OR | — | ◇ UNVERIFIED |
| NENew Erie Bella Vista | Hiwasse | AR | — | ◇ UNVERIFIED |
| NSNewman & Sons INC. | Bloomington | CA | — | ◇ UNVERIFIED |
| NINewoods, INC. | Little Rock | AR | — | ◇ UNVERIFIED |
| NINicmar Industries INC Dba George R Roberts Company | Alfred | ME | — | ◇ UNVERIFIED |
| NCNitterhouse Concrete Precast Plt | Chambersburg | PA | — | ◇ UNVERIFIED |
| NANorth American Pipe & Precast | Courtland | MN | — | ◇ UNVERIFIED |
| NANorth American Precast Company | Houston | TX | — | ◇ UNVERIFIED |
| NANortheast Architectural Products INC. | Archbald | PA | — | ◇ UNVERIFIED |
| NONortheast Ohio Precast LLC | Salem | OH | — | ◇ UNVERIFIED |
| NPNortheast Prestressed Products, LLC | Brogue | PA | — | ◇ UNVERIFIED |
| NPNortheast Prestressed Products, LLC. | Pottsville | PA | — | ◇ UNVERIFIED |
| NINorthern Il Wilbert Vault CO INC | Belvidere | IL | — | ◇ UNVERIFIED |
| NBNorthfield Block CO | Channahon | IL | — | ◇ UNVERIFIED |
| NBNorthfield Block CO | Forest View | IL | — | ◇ UNVERIFIED |
| NBNorthfield Block CO | Mundelein | IL | — | ◇ UNVERIFIED |
| NBNorthfield Block CO | Joliet | IL | — | ◇ UNVERIFIED |
| NBNorthfield Block Company | Indianapolis | IN | — | ◇ UNVERIFIED |
| NBNorthfield Block Company | Elgin | IL | — | ◇ UNVERIFIED |
| NBNorthfield Block INC | Romeoville | IL | — | ◇ UNVERIFIED |
| NMNorthfield Mundelein Plant | Mundelein | IL | — | ◇ UNVERIFIED |
| NRNorthgate Ready Mix | Windsor | CA | — | ◇ UNVERIFIED |
| NMNorth Marina Ameron Hulbert | Everett | WA | — | ◇ UNVERIFIED |
| NINorthwest Illinois Construction CO | Rock Falls | IL | — | ◇ UNVERIFIED |
| NCNorthwind Concrete Products CO | Posen | IL | — | ◇ UNVERIFIED |
| NCNorthwind Concrete Products CO | South Beloit | IL | — | ◇ UNVERIFIED |
 Norwalk Concrete Industries, INC. | Norwalk | OH | — | ◇ UNVERIFIED |
| NVNorwalk Vault CO. of Missouri INC. | Saint Louis | MO | — | ◇ UNVERIFIED |
| NCNova Crete, INC. | Fort Lee | NJ | — | ◇ UNVERIFIED |
| NANov Ameron | Anniston | AL | — | ◇ UNVERIFIED |
| NINucast Industries INC | Corona | CA | — | ◇ UNVERIFIED |
| NLNurazzo, LLC | Dalton | GA | — | ◇ UNVERIFIED |
| NCNW Concrete Vent Wells LLC | Gervais | OR | — | ◇ UNVERIFIED |
| OCOaks Concrete Products INC | Wixom | MI | — | ◇ UNVERIFIED |
| ODOberfields - Delaware, Oh Masonry Plant | Delaware | OH | — | ◇ UNVERIFIED |
| OLOberfield's LLC | Delaware | OH | — | ◇ UNVERIFIED |
| OGOcean Granite and Marble LLC | Little Egg Harbor Twp | NJ | — | ◇ UNVERIFIED |
| OCOdum Concrete Products INC | West Frankfort | IL | — | ◇ UNVERIFIED |
| OCOgden Concrete Batch Plant G19 | Ogden | UT | — | ◇ UNVERIFIED |
| OOldcastle | Lebanon | PA | — | ◇ UNVERIFIED |
| OOldcastle | Keizer | OR | — | ◇ UNVERIFIED |
| OOldcastle | Eugene | OR | — | ◇ 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. | Montgomery | AL | — | ◇ UNVERIFIED |
| OAOldcastle Apg South, INC. Dba Adams Products | Greensboro | NC | — | ◇ UNVERIFIED |
| OAOldcastle Architectural West | North Salt Lake | UT | — | ◇ UNVERIFIED |
| OCOldcastle Coastal | Tampa | FL | — | ◇ UNVERIFIED |
| OCOldcastle Coastal, INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| OEOldcastle Enclosure Solutions | Tracy | CA | — | ◇ UNVERIFIED |
| OIOldcastle, INC. | Leesburg | VA | — | ◇ UNVERIFIED |
| OCOld Castle INC 4d | Midland | MI | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure | Midway | FL | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure | Acworth | GA | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure | Romeoville | IL | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure | Nampa | ID | — | ◇ UNVERIFIED |
 Oldcastle Infrastructure, INC - Fontana | Fontana | CA | — | ◇ UNVERIFIED |
| Oldcastle Infrastructure, INC. - Phoenix Oes | Phoenix | AZ | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure - Platteville | Loveland Area | CO | — | ◇ UNVERIFIED |
| OMOldcastle Miller Bonner Springs | Bonner Springs | KS | — | ◇ UNVERIFIED |
| ONOldcastle Nampa Madison | Nampa | ID | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Perris | CA | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Easton | PA | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Fontana | CA | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Elk River | MN | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Tualatin | OR | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Morrisville | PA | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Clackamas | OR | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Stone Mountain | GA | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Folsom | NJ | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC | Bartow | FL | — | ◇ UNVERIFIED |
| OPOldcastle Precast INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| OPOldcastle Precast, INC. | Ontario | CA | — | ◇ UNVERIFIED |
| OPOldcastle Precast Pipe | Folsom | NJ | — | ◇ UNVERIFIED |
| OSOldcastle Savannah | Guyton | GA | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group- Port Concrete Plant | Gunnison | CO | — | ◇ UNVERIFIED |
| OWOldcastle Westile, INC. | Littleton | CO | — | ◇ UNVERIFIED |
| OPOlsen Pavingstone INC | San Juan Capistrano | CA | — | ◇ UNVERIFIED |
| OPOlympian Precast INC | Redmond | WA | — | ◇ UNVERIFIED |
| OMOlympic Marble | Buena Park | CA | — | ◇ UNVERIFIED |
| OWOmaha Wilbert Vault, INC. | Omaha | NE | — | ◇ UNVERIFIED |
| OPOmega Products International, INC. | Commerce City | CO | — | ◇ UNVERIFIED |
| OPOmni Products, INC. | Lincolnton | NC | — | ◇ UNVERIFIED |
| OPOrange Pavers LLC | Stroudsburg | PA | — | ◇ UNVERIFIED |
| OBOrco Blended Products INC | Highland | CA | — | ◇ UNVERIFIED |
| OBOrco Block CO INC | Banning | CA | — | ◇ UNVERIFIED |
| OBOrco Block CO INC | Stanton | CA | — | ◇ UNVERIFIED |
| OBOrco Block CO INC | Riverside | 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 |
