| RWRoyal White Cement | Houston | TX | — | ◇ UNVERIFIED |
| RRR R Beasley Incorporated - Kilmarnock | Kilmarnock | VA | — | ◇ UNVERIFIED |
| RRR & R Garden Supply, INC. | Medley | FL | — | ◇ UNVERIFIED |
| RSR & S Concrete | Fresno | TX | — | ◇ UNVERIFIED |
| RRR&t Redi Mix - 7355 Colorado 196 | Lamar 3.3 Mi. N of | CO | — | ◇ UNVERIFIED |
| RRRuach Resources LLC - Portable Wash Plant I | Tioga | ND | — | ◇ UNVERIFIED |
| RRRuach Resources LLC - Williston Ready Mix Plant | Williston | ND | — | ◇ UNVERIFIED |
| RBRubble Bee Recycling | Stafford | VA | — | ◇ UNVERIFIED |
| RCRuby Concrete Company INC | Madisonville | KY | — | ◇ UNVERIFIED |
| RCRuiz Concrete & Paving INC Dba Ruiz Engineering INC | Long Beach | CA | — | ◇ UNVERIFIED |
| RHRulon Harper Construction, INC. Pit No. 6 | Salt Lake County | UT | — | ◇ UNVERIFIED |
| RHRulon Harper Construction Pit #12 | Tooele | UT | — | ◇ UNVERIFIED |
| RBRussell Block Co., INC. | Russell | KS | — | ◇ UNVERIFIED |
| RRRussell Ready Mix Concrete, INC. | Russell | KS | — | ◇ UNVERIFIED |
| RVRustin Vault & Monument Co., INC. | Chipley | FL | — | ◇ UNVERIFIED |
| RCRvier City Redemix | Salmon | ID | — | ◇ UNVERIFIED |
| RBRw Busse Excavating | Grand Lake | CO | — | ◇ UNVERIFIED |
| RSR.w. Sidley, INC. | Slippery Rock | PA | — | ◇ UNVERIFIED |
| RSR.w. Sidley, INC. | Youngwood | PA | — | ◇ UNVERIFIED |
| SPSabine Pass Cbp | Port Arthur | TX | — | ◇ UNVERIFIED |
| SPSabine Pass Lng LP - Sabine Pass Lng Import Terminal | Johnsons Bayou | LA | — | ◇ UNVERIFIED |
| SPSabine Pass Washout Facility | Port Arthur | TX | — | ◇ UNVERIFIED |
| SPSacramento Prestige Gunite | Rocklin | CA | — | ◇ UNVERIFIED |
| SSSacramento Stucco | West Sacramento | CA | — | ◇ UNVERIFIED |
| SHSaint Henry Tile CO INC Dba Berne Ready Mix | Berne | IN | — | ◇ UNVERIFIED |
| SMSaldanas Masonry | Brownsville | TX | — | ◇ UNVERIFIED |
| SPSalem Plant | Salem | MO | — | ◇ UNVERIFIED |
| SRSalem Ready Mix, LLC | Salem | SD | — | ◇ UNVERIFIED |
| SCSalina Concrete Products | Salina | KS | — | ◇ UNVERIFIED |
| SCSalinas Concrete | Deming | NM | — | ◇ UNVERIFIED |
| SVSaline Vault Company INC. | Sweet Springs | MO | — | ◇ UNVERIFIED |
| SSalisbury | Salisbury | MD | — | ◇ UNVERIFIED |
| SMSamoa Maritime | Pago Pago | AS | — | ◇ UNVERIFIED |
| SWSamsula Waste INC | New Smyrna Beach | FL | — | ◇ UNVERIFIED |
| SBSan Benito Supply | Paso Robles | CA | — | ◇ UNVERIFIED |
| SBSan Benito Supply - Watsonville | Watsonville | CA | — | ◇ UNVERIFIED |
| SISandco INC | Durango | CO | — | ◇ UNVERIFIED |
| SCSand Creek Concrete LLC | Hoxie | KS | — | ◇ UNVERIFIED |
| SDSan Diego Precast Concrete INC | San Diego | CA | — | ◇ UNVERIFIED |
| SDSan Diego Precast, INC. Dba Pomeroy | Perris | CA | — | ◇ UNVERIFIED |
| SISandman INC Dba Star Concrete | Hollister | CA | — | ◇ UNVERIFIED |
| SISandman, INC. Dba Star Concrete | San Jose | CA | — | ◇ UNVERIFIED |
| SISandman INC Doing Business As Star Concrete | Morgan Hill | CA | — | ◇ UNVERIFIED |
| SAS and N Concrete | Anaconda | MT | — | ◇ UNVERIFIED |
| SISandstone, Inc. | Shawnee | KS | — | ◇ UNVERIFIED |
| SASanford Airport Temporary Batch Plant | Sanford | FL | — | ◇ UNVERIFIED |
| SDSangre De Cristo Gravel Product | Las Vegas | NM | — | ◇ UNVERIFIED |
| SUSanjel Usa, INC. | Rifle Area | CO | — | ◇ UNVERIFIED |
| SJSan Joaquin Gunite | Sjvapcd | CA | — | ◇ UNVERIFIED |
| SJSan Juan Redimix LLC | Pagosa Springs | CO | — | ◇ UNVERIFIED |
| SJSan Juan Redimix - Pagosa Rmc | Pagosa Springs 2.1 Mi. Nw of | CO | — | ◇ UNVERIFIED |
| SCSannipoli CORP | Menifee | CA | — | ◇ UNVERIFIED |
| SCSannipoli Corporation | Fairfield | CA | — | ◇ UNVERIFIED |
| SFSanta Fe Aggregates INC | Sanger | CA | — | ◇ UNVERIFIED |
| SFSanta Fe Fee H Tb Swdw #12 Facility | Marksville | LA | — | ◇ UNVERIFIED |
| SMSanta Maria Concrete Plant | Santa Barbara | CA | — | ◇ UNVERIFIED |
| SRSantee Redi Mix | Moncks Corner | SC | — | ◇ UNVERIFIED |
| SVSanteiu Vaults INC | Livonia | MI | — | ◇ UNVERIFIED |
| SLSantiago Lopez Concrete INC. | Lajas | PR | — | ◇ UNVERIFIED |
| SXSan Xavier Rock & Materials - Cortaro Plant #23 | Tucson | AZ | — | ◇ UNVERIFIED |
| STSarasota Transport LLC | Westerville | OH | — | ◇ UNVERIFIED |
| SPSaratoga Plant | Corpus Christi | TX | — | ◇ UNVERIFIED |
| SCSather Concrete Products INC | Merrifield | MN | — | ◇ UNVERIFIED |
| SCSather Construction, LLC | Boise | ID | — | ◇ UNVERIFIED |
| SCSaunders Companies, INC. | Cortland | NY | — | ◇ UNVERIFIED |
| SRSavannah Ready Mix, LLC | Savannah | GA | — | ◇ UNVERIFIED |
| S2Savid 26 LLC | Ventura | CA | — | ◇ UNVERIFIED |
| S2Savid 26 LLC | Baldwin Park | CA | — | ◇ UNVERIFIED |
| SNSax Nick LLC | Gibsonville | NC | — | ◇ UNVERIFIED |
| SISay-core, INC. | Portage | PA | — | ◇ UNVERIFIED |
| SCS.b. Cox Ready Mix | Newport News | VA | — | ◇ UNVERIFIED |
| SBS B Cox Ready Mix - Gloucester Plant | Gloucester | VA | — | ◇ UNVERIFIED |
| SBS B Cox Ready Mix INC - Chesapeake Plant | Chesapeake | VA | — | ◇ UNVERIFIED |
| SBS B Cox Ready Mix INC Doswell Plant | Doswell | VA | — | ◇ UNVERIFIED |
| SBS B Cox Ready Mix INC - Goochland Plant | Rockville | VA | — | ◇ UNVERIFIED |
| SBS B Cox Ready Mix-nottoway Plant | Blackstone | VA | — | ◇ UNVERIFIED |
| SRSchaaf Redi Mix | Atkinson | NE | — | ◇ UNVERIFIED |
| SCSchirz Concrete Products INC | Greenfield | IL | — | ◇ UNVERIFIED |
| STSchlumberger Technology Corporation | Grand Junction | CO | — | ◇ UNVERIFIED |
| SCSchreiter Concrete | Wright City | MO | — | ◇ UNVERIFIED |
| SRSchreiter Ready Mix | O Fallon | MO | — | ◇ UNVERIFIED |
| SSSchrey Systems INC | Newton | IL | — | ◇ UNVERIFIED |
| SCSchuster Concrete - Mid Pike | Rockville | MD | — | ◇ UNVERIFIED |
| SCSchuster Concrete Ready Mix - Cp18 | Alexandria | VA | — | ◇ UNVERIFIED |
| SCSchuster Concrete Ready Mix - Kalahari | Woodford | VA | — | ◇ UNVERIFIED |
| SCSchuster Concrete Ready Mix - One Logistics | Winchester | VA | — | ◇ UNVERIFIED |
| SCSchuur Concrete LLC | Chandler | MN | — | ◇ UNVERIFIED |
 Schwartz Redi-mix INC | La Prairie | MN | — | ◇ UNVERIFIED |
| SRScioto Ready Mix | Dublin | OH | — | ◇ UNVERIFIED |
| SCScituate Concrete Products | Marshfield | MA | — | ◇ UNVERIFIED |
| SCScott City Ready Mix Plant | Scott City | KS | — | ◇ UNVERIFIED |
| SPScottsboro Plant | Scottsboro | AL | — | ◇ UNVERIFIED |
| SPSc Prestress Kingstree | Kingstree | SC | — | ◇ UNVERIFIED |
| SCScrap Central INC | Omaha | NE | — | ◇ UNVERIFIED |
| SCScripture's Concrete INC. | Rockport | ME | — | ◇ UNVERIFIED |
| SCScruggs Concrete Company | Madison | FL | — | ◇ UNVERIFIED |
| SSSculptured Stone INC. | Fairfield | NJ | — | ◇ UNVERIFIED |
| SIScurlock Industries of Springfield-springfiled | Springfield | MO | — | ◇ UNVERIFIED |
| SCSd Concrete Pumping INC | Santee | CA | — | ◇ UNVERIFIED |
| SCSeaboard Concrete Products Company Incorporated | Richmond | VA | — | ◇ UNVERIFIED |
