| RIRm Industrials - Rm Rail Park Recycle Op | Aurora | — | ◇ UNVERIFIED |
| RFRoaring Fork Redi Mix INC | Lakewood | — | ◇ UNVERIFIED |
| RCRobins Construction - 5101 State Hwy 285 | Antonito Area | — | ◇ UNVERIFIED |
| RIRockustics INC | Aurora | — | ◇ UNVERIFIED |
| RMRocky Mountain Cultured Marble INC | Fort Collins | — | ◇ UNVERIFIED |
| RMRocky Mountain Marble | Peyton | — | ◇ UNVERIFIED |
| RMRocky Mountain Premix - Wabash Plant | Colorado Springs | — | ◇ UNVERIFIED |
| RMRocky Mountain Prestress LLC (structural Plant) | Denver | — | ◇ UNVERIFIED |
| RMRocky Mountain Redi Mix Plt No3 | Rifle | — | ◇ UNVERIFIED |
| RCRocla Concrete Tie Incorporated | Denver | — | ◇ UNVERIFIED |
| SISandco INC | Durango | — | ◇ UNVERIFIED |
| STSchlumberger Technology Corporation | Grand Junction | — | ◇ UNVERIFIED |
| S0See 041-0231-03 Pete Lien & Sons | Colorado Springs | — | ◇ UNVERIFIED |
| SCSiegrist Construction CO -del Camino Pit | Longmont | — | ◇ UNVERIFIED |
| SCSimon Contractors - Bennett Ready-mix | Bennett | — | ◇ UNVERIFIED |
| SCSimon Contractors Dba Ogallala Ready Mix | Ogallala | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix Concrete, LLC - Capital Ready Mix | Colorado Springs | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix Concrete, LLC - Highway 85 Ready | Colorado Springs | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix - Osage Portable Plant | Denver | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix - Summit View Ready Mix | Fort Collins | — | ◇ UNVERIFIED |
| SRSouthwest Readymix | Alamosa | — | ◇ UNVERIFIED |
| SWSpn Well Services - Fort Lupton Facility | Fort Lupton Area | — | ◇ UNVERIFIED |
| SRSterling Ready Mix Concrete Co.cn | Kit Carson | — | ◇ UNVERIFIED |
| SWStone Wholesale - Brownstone Quarry | Laporte | — | ◇ UNVERIFIED |
| SRSuburban Reddi Mix CO | Adams Cnty | — | ◇ UNVERIFIED |
| SRSuburban Reddi-mix CO. | Aurora | — | ◇ UNVERIFIED |
| SVSummit View | Fort Collins | — | ◇ UNVERIFIED |
| THTezak Heavy Equipment CO | Canon City | — | ◇ UNVERIFIED |
| TITopperscot INC | Denver | — | ◇ UNVERIFIED |
| TMTransit Mix Concrete | Pueblo West | — | ◇ UNVERIFIED |
| TMTransit Mix Concrete & Materials CO | Henderson | — | ◇ UNVERIFIED |
| TMTransit Mix Concrete - Monument Batch | Monument | — | ◇ UNVERIFIED |
| TMTransit Mix of Pueblo | Pueblo | — | ◇ UNVERIFIED |
| URUnited Ready Mix | Platteville | — | ◇ UNVERIFIED |
| URUnited Ready Mix - Platteville | Platteville | — | ◇ UNVERIFIED |
| UMUS Mix CO. | Denver | — | ◇ UNVERIFIED |
| VIValco INC | Rocky Ford | — | ◇ UNVERIFIED |
| VIValco INC | Canon City | — | ◇ UNVERIFIED |
| VIValcrete, INC. - Concrete Batch Plant | Swink Area | — | ◇ UNVERIFIED |
| VBValley Block Loveland Facility | Loveland | — | ◇ UNVERIFIED |
| VCVarra Companies INC | Colorado | — | ◇ UNVERIFIED |
| VCVarra Companies INC Ft Lupton Plant 2 | Fort Lupton | — | ◇ UNVERIFIED |
| WCWells Concrete - Architectural Plant | Denver | — | ◇ UNVERIFIED |
| WDWells Denver Precast | Brighton | — | ◇ UNVERIFIED |
| WMWestern Mobile Denver INC | Golden | — | ◇ UNVERIFIED |
| WMWestern Mobile Northern Bayfield Pit | Walden 18.5 Mi. Se of | — | ◇ UNVERIFIED |
| WRWest Ranch Aggregate - Port Generator | Rocky Ford Area | — | ◇ UNVERIFIED |
| WRWhite River Sand & Gravel-meeker Pit | Meeker | — | ◇ UNVERIFIED |
| WRWray Readi Mix INC. | Wray | — | ◇ UNVERIFIED |
| ZDZak Dirt - Portable Batch Plant | Mead | — | ◇ UNVERIFIED |
