| Clear Way LLC | RGC | 2026 | Active |
| Clearpath Renovations LLC | RGC | 2025 | Active |
| Clemmens Painting LLC | RGC + LBPR | 2020 | Active |
| Climate Design Build LLC | RGC | 2026 | Active |
| Cline Construction LLC | RGC | 2012 | Active |
| Clockwork Handyman & Remodeling Services LLC | RGC | 2014 | Active |
| Clover Soup LLC | RGC + LBPR | 2026 | Active |
| Clow Roofing & Siding Company | CGC2, RGC + LBPR | 1982 | Active |
| CM Appliance Care LLC | RGC | 2025 | Active |
| CM Painting & Coating LLC | RGC | 2019 | Active |
| CNT Construction LLC | RGC | 2004 | Active |
| Coast Industries Northwest Inc | RGC | 2024 | Active |
| Coastwood Construction LLC | RGC | 2026 | Active |
| Cobo Enterprises LLC | RGC + LBPR | 2026 | Active |
| Cobre Electric LLC | CGC2, RGC | 2025 | Active |
| Coda Construction LLC | RGC + LBPR | 2016 | Active |
| Code 4 Construction LLC | RGC | 2019 | Active |
| Coe Construction Co | CGC1, RGC | 1976 | Active |
| Cogan Contracting LLC | RGC + LBPR | 2020 | Active |
| Cohabit Design & Construct LLC | RGC | 2005 | Active |
| Coin Meter Company | CGC2 | 2020 | Active |
| Colas Construction Inc | CGC1, RGC | 1997 | Active |
| Colas Structures LLC | CGC1 | 2016 | Active |
| Cold Mountain Construction LLC | CGC2, RGC | 2019 | Active |
| Colin General Contractor LLC | RGC | 2024 | Active |
| Colman Construction LLC | RGC | 2026 | Active |
| Colonial Building Maintenance Inc | CGC2 + RSC | 1990 | Active |
| Colorado Structures Inc | CGC1 | 1991 | Active |
| Columbia Air Care LLC | RGC | 2009 | Active |
| Columbia Contracting LLC | RGC + LBPR | 2019 | Active |
| Columbia Crossing Construction LLC | RGC | 2018 | Active |
| Columbia Electric Oregon LLC | RGC | 2011 | Active |
| Columbia Executive Construction LLC | CGC2, RGC | 2026 | Active |
| Columbia Heating & Cooling LLC | RGC | 2020 | Active |
| Columbia Lawn Care Plus LLC | RGC | 2021 | Active |
| Columbia River Painting LLC | RGC + CSC2 | 2017 | Active |
| Combs Remodel Construction LLC | RGC | 2006 | Active |
| Commercial Building Service Inc | CGC2 | 2018 | Active |
| Commercial Paint Contractors LLC | CGC2, RGC | 2018 | Active |
| Community Energy Project Inc | RGC + LBPR | 2013 | Active |
| Community Management Inc | RGC | 1989 | Active |
| Compass Design Build LLC | RGC | 2026 | Active |
| Complete Coatings LLC | RGC | 2021 | Active |
| Complete Construction LLC | RGC + LBPR | 2013 | Active |
| Complete Inc | CGC2, RGC | 1995 | Active |
| Complete Remodeling & Building LLC | RGC + LBPR | 2017 | Active |
| Compound Construction LLC | RGC | 2009 | Active |
| Connect Construction LLC | RGC + LBPR | 2022 | Active |
| Connelly Construction LLC | RGC | 2009 | Active |
| Connors Cabinetry And Woodworks LLC | RGC | 2021 | Active |
| Conrad Construction LLC | RGC + LBPR | 2017 | Active |
| Consolidated Supply Co | CGC2 | 2016 | Active |
| Construct Northwest LLC | RGC | 2026 | Active |
| Construction Now LLC | RGC | 2023 | Active |
| Conte Construction LLC | RGC | 2020 | Renew by Dec 28, 2026 |
| Contemporary Homes LLC | RGC | 2019 | Active |
| Context Woodworking LLC | RGC | 2023 | Active |
| Contratto LLC | RGC | 2026 | Active |
| Conway General Contracting Inc | RGC | 2006 | Renew by Dec 26, 2026 |
| Cook Brothers Omnia LLC | RGC | 2012 | Active |
| Cook Construction & Renovation LLC | RGC | 2025 | Active |
| Cook Solutions Group Inc | CGC2, RGC | 2002 | Active |
| Coolers & More LLC | CGC2, RGC | 2020 | Active |
| Cooper Mountain Roofing Inc | RGC + LBPR | 2024 | Active |
| Cooper Zietz Engineers Inc | CGC2 | 2010 | Active |
| Coras Construction LLC | RGC | 2017 | Active |
| Cordillera Group LLC | CGC2, RGC | 2024 | Active |
| Cornell Design And Build LLC | RGC + LBPR | 2023 | Active |
| Cornels Plumbing Inc | RGC + LBPR | 2024 | Active |
| Corner Image Properties LLC | RGC | 2025 | Active |
| Corner To Corner G C LLC | RGC | 2019 | Active |
| Cornerstone Builders & Plumbing LLC | RGC | 2026 | Active |
| Cornerstone Construction Services LLC | RGC + LBPR | 2012 | Active |
| Cornerstone Disaster Repair Inc | CGC2, RGC + LBPR | 2004 | Active |
| Cornerstone Quality Home Services LLC | RGC | 2022 | Renew by Dec 30, 2026 |
| Corpac Construction Company | CGC2 | 2012 | Active |
| Corps Of Discovery Development LLC | RGC | 2019 | Active |
| Corrib Construction LLC | RGC + LBPR | 2010 | Active |
| Cosmic Landscape LLC | RGC | 2026 | Active |
| Costalupes Renovations LLC | RGC | 2026 | Active |
| Cotta Construction Corporation | CGC2, RGC | 2024 | Active |
| Cottonwood Finishes LLC | RGC + LBPR | 2012 | Active |
| Cougar Restoration Inc | RGC + LBPR | 2022 | Active |
| Coulee Concrete Designs LLC | RGC + CSC2 | 2006 | Active |
| Council Crest Construction LLC | RGC | 2019 | Active |
| Courtesy Construction Company And Maintenance Inc | RGC | 2021 | Active |
| Cox Bros Construction Inc | RGC | 1989 | Active |
| CP Development LLC | RGC | 2022 | Active |
| Craft Construction And Development Inc | RGC | 1999 | Active |
| Craft Master LLC | RGC + LBPR | 2015 | Active |
| Craftbau LLC | RGC + LBPR | 2015 | Active |
| Crafted Homes And Developments LLC | RGC | 2020 | Active |
| Craftline LLC | RGC + LBPR | 2025 | Active |
| Craftsman Design And Renovation LLC | RGC + LBPR | 2010 | Active |
| Craftsman Homes LLC | RGC | 2017 | Active |
| Craftworx Remodeling & Contracting LLC | RGC | 2026 | Active |
| Craig Design Group LLC | RGC + LBPR | 2019 | Active |
| Crawford Contracting LLC | RGC | 2005 | Active |
| CRD Painting LLC | RGC | 2024 | Renew by Dec 24, 2026 |
| Creative Flooring And Bath LLC | RGC | 2022 | Active |