| NENorthwestern Engineering | Commerce City | — | ◇ UNVERIFIED |
| OPOffen Petroleum INC | Commerce City | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group Dba United CO of Mesa | Gunnison 2.6 Mi. E of | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group, INC. - Asphalt Plant | Mancos Area | — | ◇ UNVERIFIED |
| OOOxy Occidental Petroleum Corporation | Denver | — | ◇ UNVERIFIED |
| PCPalisade Const | Craig | — | ◇ UNVERIFIED |
| PCPalisade Const CO | Meeker | — | ◇ UNVERIFIED |
| PRPavement Reclaiming Concepts | Fort Collins | — | ◇ UNVERIFIED |
| PSPetro Source Refining CORP | Fruita | — | ◇ UNVERIFIED |
| P6Phillips 66 - Former Oriental Refinery | Alamosa Area | — | ◇ UNVERIFIED |
| PCPopejoy Const | Larkspur | — | ◇ UNVERIFIED |
| PIProcessors INC | Denver | — | ◇ UNVERIFIED |
| PPPueblo Paving CO. | Pueblo | — | ◇ UNVERIFIED |
| PCPurecycle CORP | Commerce City | — | ◇ UNVERIFIED |
| RGRed Giant Oil Company LLC | Denver | — | ◇ UNVERIFIED |
| RORex Oil CO | Golden | — | ◇ UNVERIFIED |
| RPRitchie Paving INC. | Colorado | — | ◇ UNVERIFIED |
| RMRocky Mountain Materials & Asphalt INC | City Name Not Provided | — | ◇ UNVERIFIED |
| SCSchmidt Construction Co.-delta Drive Fac | Colorado Springs | — | ◇ UNVERIFIED |
| SESchrader Environmental Services | Fort Collins | — | ◇ UNVERIFIED |
| SCSiegrist Const | Denver | — | ◇ UNVERIFIED |
| SCSimon Contractors - Rushmore Bc Plant | Statewide | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix Concrete, LLC - Spec Agg Ready Mix | Golden | — | ◇ UNVERIFIED |
| TITeksonix INC Gary Ref Fruita CO | Fruita | — | ◇ UNVERIFIED |
| TCTerra Const CO | Elizabeth | — | ◇ UNVERIFIED |
| TCTower Const | Unknown | — | ◇ UNVERIFIED |
| TWTriad Western Constructor INC | Cortez | — | ◇ UNVERIFIED |
| VBVance Bros INC | Aurora | — | ◇ UNVERIFIED |
| WCWestern Consolidated Ind | Fort Lupton | — | ◇ UNVERIFIED |
| WMWestern Mobile | Greeley | — | ◇ UNVERIFIED |
| WMWestern Mobile Boulder INC | Boulder | — | ◇ UNVERIFIED |
| WMWestern Mobile INC | Boulder | — | ◇ UNVERIFIED |
| WMWestern Mobile Northern INC | El Paso County | — | ◇ UNVERIFIED |
| WMWestern Mobile Northern Prospect Plt | Fort Collins | — | ◇ UNVERIFIED |
| WPWestern Paving #2 | Westminster | — | ◇ UNVERIFIED |
| WPWestern Paving Const.cn | Golden | — | ◇ UNVERIFIED |
| WTWilliam Thompson | Elbert Cnty | — | ◇ UNVERIFIED |
| YCYuma County Highway Department | Eckley Area | — | ◇ UNVERIFIED |
