| RMRocky Mountain Premix - Wabash Plant | Colorado Springs | CO | — | ◇ UNVERIFIED |
| RMRocky Mountain Redi Mix Plt No3 | Rifle | CO | — | ◇ UNVERIFIED |
| RRRoessler Ready Mix INC | Columbia | IL | — | ◇ UNVERIFIED |
| RFRogers Field Production Facility | Nebo | LA | — | ◇ UNVERIFIED |
| RGRogers Group, INC. - Livingston Quarry - Allons Plant/imi-tn, INC. | Livingston | TN | — | ◇ UNVERIFIED |
| RRRogers Ready Mix | Sparta | IL | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials | Byron | IL | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials INC | Rockford | IL | — | ◇ UNVERIFIED |
| RRRogers Redi-mix | Ruma | IL | — | ◇ UNVERIFIED |
| RLRollcon Llc, Onsite Plant | Clinton | MS | — | ◇ UNVERIFIED |
| RRRonald Reagan Cbp | Georgetown | TX | — | ◇ UNVERIFIED |
| RRRoscoe Ready - Mix INC | Pecatonica | IL | — | ◇ UNVERIFIED |
| RCRosebud Concrete INC | Mission | SD | — | ◇ UNVERIFIED |
| RCRosenfeld Concrete CORP | Hopedale | MA | — | ◇ UNVERIFIED |
| RCRouland Concrete and Supplies | Jacksonville | IL | — | ◇ UNVERIFIED |
| RMRowe Materials - Spotsylvania Plant | Fredericksburg | VA | — | ◇ UNVERIFIED |
| RCRowland Concrete Company | Danville | VA | — | ◇ UNVERIFIED |
| RNRoxboro - Nc Rmc | Roxboro | NC | — | ◇ UNVERIFIED |
| RRRoxbury Ready Mix Incorporated | Charles City | VA | — | ◇ UNVERIFIED |
| RRR R Beasley Incorporated - Kilmarnock | Kilmarnock | VA | — | ◇ UNVERIFIED |
| RRRuach Resources LLC - Portable Wash Plant I | Tioga | ND | — | ◇ UNVERIFIED |
| RBRubble Bee Recycling | Stafford | VA | — | ◇ UNVERIFIED |
| RHRulon Harper Construction, INC. Pit No. 6 | Salt Lake County | UT | — | ◇ UNVERIFIED |
| RRRussell Ready Mix Concrete | Russell | KS | — | ◇ UNVERIFIED |
| RARustin Ardmore Rmc Plant | Ardmore | OK | — | ◇ UNVERIFIED |
| RCRvier City Redemix | Salmon | ID | — | ◇ UNVERIFIED |
| SSacaton | Sacaton | AZ | — | ◇ UNVERIFIED |
| SRSaginaw Rock Products Company | Saginaw | MI | — | ◇ UNVERIFIED |
| SPSaint-gobain Proppants (lr) | Benton | AR | — | ◇ UNVERIFIED |
| SASan Angelo 1 | San Angelo | TX | — | ◇ UNVERIFIED |
| SASan Angelo 2 | San Angelo | TX | — | ◇ UNVERIFIED |
| SASan Angelo Ready Mix Plant | San Angelo | TX | — | ◇ UNVERIFIED |
| SISandco INC | Durango | CO | — | ◇ UNVERIFIED |
| SCSandidge Concrete - Jefferson City | Jefferson City | MO | — | ◇ UNVERIFIED |
| SASanford Airport Temporary Batch Plant | Sanford | FL | — | ◇ UNVERIFIED |
| SFSan Francisco (a) | San Francisco | CA | — | ◇ UNVERIFIED |
| SXSan Xavier Rock & Materials - Cortaro Plant #23 | Tucson | AZ | — | ◇ UNVERIFIED |
| SBS B Cox Incorporated - Powhatan | Powhatan | VA | — | ◇ UNVERIFIED |
| SBS B Cox Ready Mix INC Doswell Plant | Doswell | VA | — | ◇ UNVERIFIED |
| SIS&b Industrial Minerals North America, INC. | Morganton | NC | — | ◇ UNVERIFIED |
| SCScc Concrete INC | Lopatcong | NJ | — | ◇ UNVERIFIED |
| SRSchaaf Redi Mix | Atkinson | NE | — | ◇ UNVERIFIED |
| STSchlumberger Technology Corporation | Grand Junction | CO | — | ◇ UNVERIFIED |
| SSSchrey Systems INC | Newton | IL | — | ◇ UNVERIFIED |
| SCSchuster Concrete Ready Mix Llc-guilford Rd | Jessup | MD | — | ◇ UNVERIFIED |
| SCSchuster Concrete Ready Mix Llc-hobbs Rd | Denton | MD | — | ◇ UNVERIFIED |
| SCSchuster Concrete Ready Mix Llc-southlawn Ln | Rockville | MD | — | ◇ UNVERIFIED |
| SCSchuster Concrete Ready Mix - One Logistics | Winchester | VA | — | ◇ UNVERIFIED |
| SDSchuster, Daniel, INC. | Owings Mills | MD | — | ◇ UNVERIFIED |
| SPScottsboro Plant | Scottsboro | AL | — | ◇ UNVERIFIED |