| RKRiestras Kitchen & Bath | Westminster | — | ◇ UNVERIFIED |
| RFRoaring Fork Redi-mix | Steamboat Springs | — | ◇ UNVERIFIED |
| RFRoaring Fork Redi Mix INC | Empire | — | ◇ UNVERIFIED |
| RFRoaring Fork Redi Mix INC | Dotsero | — | ◇ UNVERIFIED |
| RBRobinson Block LLC (was Colo Cncrt Mfg) | Colorado Springs | — | ◇ UNVERIFIED |
| RBRobinson Brick CO | Denver | — | ◇ UNVERIFIED |
| RBRobinson Brick CO | Aurora | — | ◇ UNVERIFIED |
| RHRock Horeb Marble and Granite | Denver | — | ◇ UNVERIFIED |
| RMRocky Mountain Prestress | Greeley | — | ◇ UNVERIFIED |
| RMRocky Mountain Ready Mix Concrete INC | Denver | — | ◇ UNVERIFIED |
| RMRocky Mountain Redi-mix | Eagle | — | ◇ UNVERIFIED |
| RMRocky Mountain Scientific Glass Blowing | Denver | — | ◇ UNVERIFIED |
| RMRocky Mt Prestressed | Sheridan | — | ◇ UNVERIFIED |
| RMRoyal Marble, LLC | Florence | — | ◇ UNVERIFIED |
| SISanjel (usa) INC. | Fort Lupton | — | ◇ UNVERIFIED |
| SUSanjel Usa, INC. | Rifle Area | — | ◇ UNVERIFIED |
| SJSan Juan Redimix LLC | Pagosa Springs | — | ◇ UNVERIFIED |
| SJSan Juan Redimix - Pagosa Rmc | Pagosa Springs 2.1 Mi. Nw of | — | ◇ UNVERIFIED |
| S0See 075/0089 Mcatee Construction Co- Riv | Sterling | — | ◇ UNVERIFIED |
| SHS & H Concrete | Aurora | — | ◇ UNVERIFIED |
| SCSiegrist Const. | Erie, Nw of | — | ◇ UNVERIFIED |
| SOSierra's of Colorado | Denver | — | ◇ UNVERIFIED |
| SCSimon Contractors, Inc, | Fort Morgan | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix Concrete, LLC - Spec Agg Ready Mix | Golden | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix - Estes Park Mix Plant | Estes Park Area | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix - Portable Ready Mix 2 | Colorado Springs | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix - Valmont Plant | Boulder Area | — | ◇ UNVERIFIED |
| SMSpanish Mill Granite CO. INC. | Buena Vista | — | ◇ UNVERIFIED |
| SHSparq Home | Denver | — | ◇ UNVERIFIED |
| SES&s Enterprises, INC. | Steamboat Springs | — | ◇ UNVERIFIED |
| SRSterling Ready Mix Concrete CO | Lamar | — | ◇ UNVERIFIED |
| SCStone City, LLC | Aurora | — | ◇ UNVERIFIED |
| SCStone Concepts of Colorado, INC | Eagle | — | ◇ UNVERIFIED |
| SCStone Crafters, INC. Dba Victor Marble | Denver | — | ◇ UNVERIFIED |
| SIStone Ideas, LLC | Aurora | — | ◇ UNVERIFIED |
| SMStone Mountain Design | Greeley | — | ◇ UNVERIFIED |
| SSStone Solutions | Breckenridge | — | ◇ UNVERIFIED |
| SWStone Works Marble and Granite | Denver | — | ◇ UNVERIFIED |
| SOStoneworks of Colorado LLC | Loveland | — | ◇ UNVERIFIED |
| SOStoneworks of Colorado, LLC | Aurora | — | ◇ UNVERIFIED |
| SRSuburban Reddi-mix - Ft. Lupton Plant | Fort Lupton | — | ◇ UNVERIFIED |
| SSSummit Stone Works, INC. | Silverthorne | — | ◇ UNVERIFIED |
| SCSundown Clay Company LLC | Grand Junction | — | ◇ UNVERIFIED |
| SCSundt CORP | Cortez | — | ◇ UNVERIFIED |
| SGSunnyside Gravel | Carbondale | — | ◇ UNVERIFIED |
| SISuperior Interiors of Colorado LLC | Pagosa Springs | — | ◇ UNVERIFIED |
| SISuperior Interiors of Colorado LLC | Cortez | — | ◇ UNVERIFIED |
| TPTCK2 Properties, LLC | Colorado Springs | — | ◇ UNVERIFIED |
| TSTelluride Stone Company | Whitewater | — | ◇ UNVERIFIED |
| TSTezak Stone & Aggregate | Cotopaxi | — | ◇ UNVERIFIED |
