| MPMobile Premix Conc.cn | Lone Tree | — | ◇ UNVERIFIED |
| MPMobile Premix Concrete | Henderson | — | ◇ UNVERIFIED |
| MPMobile Premix INC Permit 85lr150 | Fort Collins | — | ◇ UNVERIFIED |
| MRMoffat Ready Mix | Craig | — | ◇ UNVERIFIED |
| MCMontrose Concrete | Montrose | — | ◇ UNVERIFIED |
| MRMontrose Rmc Plant | Montrose | — | ◇ UNVERIFIED |
| MKMorrison Knudsen (mk Ferguson) | Littleton | — | ◇ UNVERIFIED |
| MMMountain Mobile Mix | Minturn | — | ◇ UNVERIFIED |
| MRMountain Redi Mix | Durango | — | ◇ UNVERIFIED |
| MSMountain State Stone | Denver | — | ◇ UNVERIFIED |
| MSMountain Stone, Tile & Marble, LLC | Montrose | — | ◇ UNVERIFIED |
| MCMtg Corporation | Sheridan | — | ◇ UNVERIFIED |
| NINielsons INC | Moffat County (portable) | — | ◇ UNVERIFIED |
| NMNorman's Memorials, Inc. | Wheat Ridge | — | ◇ UNVERIFIED |
| OHODC Holdings LLC | Evans | — | ◇ UNVERIFIED |
| OAOldcastle Apg - Loveland | Loveland | — | ◇ UNVERIFIED |
| OIOldcastle Infrastructure - Platteville | Loveland Area | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group INC. | Bayfield | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group INC. Dba Four Corners | Durango 4.1 Mi. N of | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group - Minturn Concrete | Minturn | — | ◇ UNVERIFIED |
| OSOldcastle Sw Grp - Gunnison Redi-mix Pit | Gunnison Area | — | ◇ UNVERIFIED |
| OWOldcastle Westile, INC. | Littleton | — | ◇ UNVERIFIED |
| OCOrnamental Concrete INC | Arvada | — | ◇ UNVERIFIED |
| OOOut of the Animas LLC | Durango | — | ◇ UNVERIFIED |
| OGOwens-brockway Glass - Windsor #28 | Windsor | — | ◇ UNVERIFIED |
| PCPampa Concrete CO INC Portable | Fort Collins | — | ◇ UNVERIFIED |
| PGParagon Granite & Marble | Longmont | — | ◇ UNVERIFIED |
| PPPeaks Precast LLC | Buena Vista | — | ◇ UNVERIFIED |
| PLPete Lien - Judge Orr Ready Mix Plant | Colorado Springs | — | ◇ UNVERIFIED |
| PLPete Lien & Sons - Plant #3 (drennan) | Colorado Springs | — | ◇ UNVERIFIED |
| PLPete Lien & Sons - St Barbara Ready Mix | Portable Source | — | ◇ UNVERIFIED |
| PHPinnacle Hardwood, INC | Denver | — | ◇ UNVERIFIED |
| PSPinnacle Stoneworks LLC | Denver | — | ◇ UNVERIFIED |
| PCPlum Creek Precast Company | Littleton | — | ◇ UNVERIFIED |
| PPozzolanic | Denver | — | ◇ UNVERIFIED |
| PIPozzolanic Intl | Denver | — | ◇ UNVERIFIED |
| PMPrometheus Materials INC | Longmont | — | ◇ UNVERIFIED |
| PGPryor Giggy CO | Pueblo | — | ◇ UNVERIFIED |
| PCPueblo Concrete Products | Pueblo West | — | ◇ UNVERIFIED |
| QAQuaking Aspen Stone | Pueblo | — | ◇ UNVERIFIED |
| QPQuarry Partners, LLC | Denver | — | ◇ UNVERIFIED |
| QDQuikrete Denver | Denver | — | ◇ UNVERIFIED |
| RMRaptor Materials - Durham, Great Western | Greeley | — | ◇ UNVERIFIED |
| RMReady Mixed Concrete Company | Denver | — | ◇ UNVERIFIED |
| RMReady Mixed Concrete CO - Plant 13 | Louviers | — | ◇ UNVERIFIED |
| RMRecycled Material Company INC | Commerce City | — | ◇ UNVERIFIED |
| RER E Monks Const CO | Colorado Springs | — | ◇ UNVERIFIED |
| RMRe Monks Const CO | Florence | — | ◇ UNVERIFIED |
| RGR & G Granite Works | Commerce City | — | ◇ UNVERIFIED |
| RLRhino LLC | Denver | — | ◇ UNVERIFIED |
