| ASArrowhead Stone Manufacturing INC | Knoxville | TN | — | ◇ UNVERIFIED |
| APArtistic Pavers Mfg | Miami | FL | — | ◇ UNVERIFIED |
| AVAshland Ventures Ii, LLC | Ashland | VA | — | ◇ UNVERIFIED |
| ABAti Bozeman INC | Bozeman | MT | — | ◇ UNVERIFIED |
| ASAtlantic Steel, INC | Longwood | FL | — | ◇ UNVERIFIED |
| AMAtwood Metals LLC | Bethel | MN | — | ◇ UNVERIFIED |
| ACAugusta Concrete Block | North Augusta | SC | — | ◇ UNVERIFIED |
| ABAutomotive Body Parts, INC. | Cartersville | GA | — | ◇ UNVERIFIED |
| ABAzar Block & Brick of South Texas INC | Mcallen | TX | — | ◇ UNVERIFIED |
| BBalcon | Manassas | VA | — | ◇ UNVERIFIED |
 Baltimore Fabrication | Emigsville | PA | — | ◇ UNVERIFIED |
| BBBarboursville Block Manufacturing Company | Huntington | WV | — | ◇ UNVERIFIED |
| BOBar-Fab of Florida, Inc | Clearwater | FL | — | ◇ UNVERIFIED |
| BSBarker Steel Construction, INC. | Tucson | AZ | — | ◇ UNVERIFIED |
| BRBark River Concrete Products | Bark River | MI | — | ◇ UNVERIFIED |
| BBBarrett Buisness Services INC | Gardena | CA | — | ◇ UNVERIFIED |
| BBasalite | Carson City | NV | — | ◇ UNVERIFIED |
| BCBasalite Concrete Products | Denver | CO | — | ◇ UNVERIFIED |
| BCBasalite Concrete Products | Fort Lupton | CO | — | ◇ UNVERIFIED |
| BCBasalite Concrete Products LLC. | Colorado Springs | CO | — | ◇ UNVERIFIED |
| BCBasalite Concrete Products LLC Truck Shop | Carson City | NV | — | ◇ UNVERIFIED |
| BCBasalite Concrete Products Site | Portland | OR | — | ◇ UNVERIFIED |
| BPBassbrook Products INC Dba Cohasset Concrete Produ | Cohasset | MN | — | ◇ UNVERIFIED |
| BLBaton LLC | Louisville | KY | — | ◇ UNVERIFIED |
| BLBaton LLC | Louisville | KY | — | ◇ UNVERIFIED |
| BSBayou Steel Mill Plant - Laplace Steel Mill | Laplace | LA | — | ◇ UNVERIFIED |
| BHBc Handscapes | Lenexa | KS | — | ◇ UNVERIFIED |
| BWBdm Warren Steel Operations, LLC (0278000463) | Warren | OH | — | ◇ UNVERIFIED |
| BCBear Concrete Products, INC | Cullman | AL | — | ◇ UNVERIFIED |
| BFBeaver Falls Machine Shop | Beaver Falls | PA | — | ◇ UNVERIFIED |
| BBBeavertown Block CO | Middleburg | PA | — | ◇ UNVERIFIED |
| BBBeavertown Block Co., INC. | East Freedom | PA | — | ◇ UNVERIFIED |
| BNBelhaven - Nc Rmc | Belhaven | NC | — | ◇ UNVERIFIED |
| BCBell Concrete Products INC | Bell | FL | — | ◇ UNVERIFIED |
| BIBellecrete INC | San Fernando | CA | — | ◇ UNVERIFIED |
| BPBelle Plaine Block and Tile INC | Belle Plaine | MN | — | ◇ UNVERIFIED |
| BIBend Inds | West Bend | WI | — | ◇ UNVERIFIED |
| BIBend Industries Appleton | Appleton | WI | — | ◇ UNVERIFIED |
| BBBenea Block Corporation | Kingston | MA | — | ◇ UNVERIFIED |
| BFBenicia Fabrication and Machines, INC. | Benicia | CA | — | ◇ UNVERIFIED |
| BCBesser Company USA | Alpena | MI | — | ◇ UNVERIFIED |
| BBBest Block - Bridgeton, Mo Plant [earth City] | Bridgeton | MO | — | ◇ UNVERIFIED |
| BBBest Block - Featherlite Converse Plant | Converse | TX | — | ◇ UNVERIFIED |
| BSBetco Supreme INC | Odenton | MD | — | ◇ UNVERIFIED |
| BBBetter Block Company Incorporated | Springfield | TN | — | ◇ UNVERIFIED |
| BSBirmingham Steel CORP | Bourbonnais | IL | — | ◇ UNVERIFIED |
| BCBlackhawk Cutting Services, Inc. | Beloit | WI | — | ◇ UNVERIFIED |
| BIBlastech, INC. | Gary | IN | — | ◇ UNVERIFIED |
| BBlocklite | Selma | CA | — | ◇ UNVERIFIED |
| BUBlock USA Mid-south Division, LLC | Panama City Beach | FL | — | ◇ UNVERIFIED |
| BLBlockworks, LLC | Gallatin | TN | — | ◇ UNVERIFIED |
| BLBlockworks, LLC | Winchester | TN | — | ◇ UNVERIFIED |
| BLBlockworks, LLC | Lebanon | TN | — | ◇ UNVERIFIED |
| BEBloquera El Valle INC. | Lajas | PR | — | ◇ UNVERIFIED |
| BDBlue DIamond USA LLC | Orlando | FL | — | ◇ UNVERIFIED |
| BPBlytheville Plate Works | Blytheville | AR | — | ◇ UNVERIFIED |
 Boldmark Steel Industry, LLC | Baltimore | MD | — | ◇ UNVERIFIED |
| BCBonnici Concrete L.l.c. | Utica | MI | — | ◇ UNVERIFIED |
| BCBoral Concrete Products, LLC | Dallas | TX | — | ◇ UNVERIFIED |
| BPBorgert Products | Saint Joseph | MN | — | ◇ UNVERIFIED |
| BCBosse Concrete Products | Jonesboro | GA | — | ◇ UNVERIFIED |
| BBBoxley Block, LLC | Lynchburg | VA | — | ◇ UNVERIFIED |
| BCBoxley Concrete Products | Lynchburg | VA | — | ◇ UNVERIFIED |
| BBBoykin Brothers, LLC | Baton Rouge | LA | — | ◇ UNVERIFIED |
| BBBoyle Block CO | Danville | KY | — | ◇ UNVERIFIED |
| BRBract Retaining Wall and Excavating LLC | Ashland | VA | — | ◇ UNVERIFIED |
| BSBradford Steel Co., INC. | East Freetown | MA | — | ◇ UNVERIFIED |
| BBBrenny-dahl Block CO | Cloquet | MN | — | ◇ UNVERIFIED |
| BCBrentanos Concrete Connection, INC. | Pittsburgh | PA | — | ◇ UNVERIFIED |
| BABrick Aquisition Company, INC. | Montgomery | AL | — | ◇ UNVERIFIED |
| BIBrickcraft INC | Farmersburg | IN | — | ◇ UNVERIFIED |
| BIBrothers Ironworks Co, Sarkis Tatarian | Burbank | CA | — | ◇ UNVERIFIED |
| BEBrunton Enterprises Inc,plas Tal Mfg CO | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| BPBrute Properties Concrete Block Plant | Wildwood | FL | — | ◇ UNVERIFIED |
| BHBryce Hill, INC | Saint Paris | OH | — | ◇ UNVERIFIED |
| BABuild America | Sedalia | CO | — | ◇ UNVERIFIED |
| BCBuilders Concrete | Clovis | CA | — | ◇ UNVERIFIED |
| BSBuilders Supply Company of Cookeville | Cookeville | TN | — | ◇ UNVERIFIED |
| BBBuilding Blocks, INC | Kissimmee | FL | — | ◇ UNVERIFIED |
| BDBulk Dried Materials Llc/hartley St Plt | York | PA | — | ◇ UNVERIFIED |
| BCBury Companies, Inc. | Rogers | MN | — | ◇ UNVERIFIED |
| CACaledonian Alloys | Huntington | WV | — | ◇ UNVERIFIED |
| CCCaliber Cast Stone | O Fallon | MO | — | ◇ UNVERIFIED |
| CSCalifornia Steel Industries INC | Fontana | CA | — | ◇ UNVERIFIED |
| COCalmat of Fresno | Fresno | CA | — | ◇ UNVERIFIED |
| CCCalstone Company | Tracy | CA | — | ◇ UNVERIFIED |
| CCCalstone Company | Sunnyvale | CA | — | ◇ UNVERIFIED |
| CCCalstone Company | Galt | CA | — | ◇ UNVERIFIED |
| CCCalstone Company | San Martin | CA | — | ◇ UNVERIFIED |
| CCCalstone Company Dba Mission Concrete Products | Gilroy | CA | — | ◇ UNVERIFIED |
| CTCalstone Tracy-oldcastle Apg | Tracy | CA | — | ◇ UNVERIFIED |
| CMCamelot Metals | Blaine | MN | — | ◇ UNVERIFIED |
| CSCanam Steel Corporation | Buckeye | AZ | — | ◇ UNVERIFIED |
| CBCantelli Block & Brick | Huron | OH | — | ◇ UNVERIFIED |
| CRCapital Ready Mix INC | Sun Valley | CA | — | ◇ UNVERIFIED |
| CCCapitol Concrete Products | Topeka | KS | — | ◇ UNVERIFIED |
| CECapitol Engineering & Manufacturing CO | Harvey | IL | — | ◇ UNVERIFIED |
| CECarolina East Enterprises, Inc | Enfield | NC | — | ◇ UNVERIFIED |
| CPCarpenter Powder Products INC | Bridgeville | PA | — | ◇ UNVERIFIED |
 Carpenter Technology | Worcester | MA | — | ◇ UNVERIFIED |
