| O C Construction & Painting LLC | RGC | 2020 | Renew by Dec 14, 2026 |
| Oak & Stone Inc | CGC2, RGC | 2019 | Active |
| Oakwood Construction LLC | RGC | 2001 | Active |
| Oasis Construction LLC | RGC | 2021 | Active |
| Oax Pacific Industries LLC | RGC | 2023 | Active |
| Ob Painting LLC | RGC | 2017 | Active |
| Oconnors Quality Floors Inc | RGC | 1992 | Active |
| Octopus Project Management LLC | CGC2, RGC + LBPR | 2023 | Active |
| Od Painting & Remodeling LLC | RGC | 2025 | Active |
| Oeg Inc | CGC1, RGC | 1972 | Active |
| Off The Wall Drywall LLC | RGC | 2026 | Active |
| Ohana Hardwood Company LLC | RGC | 2019 | Active |
| Olaru Builders LLC | RGC | 2024 | Active |
| Old Growth Homes LLC | RGC | 2022 | Renew by Dec 9, 2026 |
| Old Recreation LLC | RGC | 2007 | Active |
| Old School Renovations LLC | RGC | 2024 | Active |
| Old World Stone LLC | RGC | 1990 | Active |
| Olive Branch Construction And Remodel LLC | RGC | 2026 | Active |
| Olliscapes LLC | RGC | 2026 | Active |
| Olson & Jones Construction Inc | RGC + LBPR | 2010 | Active |
| Olvera & Sons Heating & Cooling LLC | RGC | 2023 | Active |
| Omni Construction LLC | RGC | 2006 | Renew by Nov 17, 2026 |
| Omni Wire Integration Group LLC | RGC | 2019 | Active |
| On Board Construction & Remodeling Inc | RGC | 2012 | Active |
| One Call Construction LLC | RGC + LBPR | 2025 | Active |
| One Fell Swoop Carpentry LLC | RGC | 2022 | Active |
| One Peak Construction LLC | RGC + LBPR | 2026 | Active |
| Oneill Construction Group Inc | CGC1, RGC | 1998 | Active |
| Oneill Walsh Community Builders LLC | CGC1, RGC | 2011 | Active |
| Onemanworld LLC | RGC + LBPR | 2025 | Active |
| Onet Construction LLC | RGC | 2025 | Active |
| Onh Construction LLC | RGC | 2026 | Active |
| Ono Construction LLC | RGC | 2021 | Active |
| Onsight Construction LLC | CGC2, RGC | 2018 | Active |
| Opabrothers LLC | RGC | 2026 | Active |
| Open Heavens Painting & Construction LLC | RGC | 2018 | Active |
| Opportunity Industries Inc | CGC1 | 2026 | Active |
| Opus Vitae Construction LLC | RGC + LBPR | 2021 | Renew by Dec 20, 2026 |
| Orange Splot LLC | RGC | 2006 | Active |
| Orderhomeenergyscore.Com LLC | RGC | 2017 | Active |
| Oregon Aerial Construction LLC | CGC1, RGC | 2007 | Active |
| Oregon Aire Inc | CGC2 | 1990 | Active |
| Oregon Choice Construction Inc | RGC | 2006 | Active |
| Oregon Contracting LLC | RGC + LBPR | 2021 | Renew by Dec 17, 2026 |
| Oregon Cornerstone Construction LLC | RGC | 2025 | Active |
| Oregon Custom Contracting LLC | RGC | 2020 | Active |
| Oregon Floor Specialists LLC | RGC | 2026 | Active |
| Oregon Labor Supply LLC | CGC2 | 2020 | Active |
| Oregon Painting And Carpenter LLC | RGC | 2019 | Active |
| Oregon Pro Exteriors LLC | RGC | 2025 | Active |
| Oregon Realty Advisors Inc | RGC | 2014 | Active |
| Oregon Specialty Systems LLC | CGC2 | 2013 | Active |
| Oregon Superb Painting LLC | CGC2, RGC | 2023 | Active |
| Oregreen Landscaping & Construction LLC | RGC | 2025 | Active |
| Oreste Construction Inc | RGC | 1996 | Active |
| Orion Building Company LLC | CGC2 + LBPR | 2025 | Active |
| Orion Electric PNW Inc | CGC2, RGC | 2024 | Active |
| Orion Unlimited LLC | RGC + LBPR | 2025 | Active |
| Orner Design And Construction LLC | RGC | 2022 | Active |
| Oss General Services LLC | RGC | 2026 | Active |
| Ostmo Construction Inc | RGC + LBPR | 2012 | Renew by Dec 19, 2026 |
| Oswego Roofing Inc | RGC | 2020 | Active |
| Otis Construction Inc | RGC + LBPR | 2010 | Active |
| Outpost Striping Co LLC | RGC | 2026 | Active |
| Outside Design Build Inc | CGC2, RGC | 2015 | Active |
| Overhead Door Co Of Portland Vancouver Inc | CGC2, RGC | 1983 | Active |
| Owen & Owen Builders Inc | CGC2, RGC + LBPR | 1992 | Active |
| Owen Construction Solutions LLC | RGC | 2025 | Active |
| Owen Gabbert LLC | CGC2, RGC + LBPR | 2013 | Active |
| Owens Incorporated | RGC | 1999 | Active |
| Ox Painting Contractors LLC | RGC + LBPR | 2025 | Renew by Nov 18, 2026 |
| Oxford Concept And Build LLC | RGC | 2024 | Active |
| Ozer Custom Carpentry LLC | RGC | 2021 | Active |
| P & C Construction Co | CGC1 + LBPR | 1981 | Active |
| P & L Remodeling Inc | RGC | 2006 | Active |
| Pace Construction LLC | RGC + LBPR | 2010 | Active |
| Pacific Building Co Inc | RGC | 2023 | Active |
| Pacific Cascade Construction Services LLC | RGC | 2024 | Active |
| Pacific Coast Home Services LLC | RGC | 2025 | Active |
| Pacific Crown Contracting LLC | RGC + LBPR | 2010 | Active |
| Pacific Elements Construction LLC | RGC | 2020 | Active |
| Pacific Entry Solutions LLC | RGC | 2023 | Active |
| Pacific Green River Construction LLC | RGC | 2026 | Active |
| Pacific Mechanical LLC | RGC | 2011 | Active |
| Pacific Mood LLC | RGC | 2021 | Active |
| Pacific Northwest Paving LLC | CGC1, RGC | 2021 | Active |
| Pacific Northwest Stone & Tile LLC | RGC | 2004 | Active |
| Pacific NW Drywall & Acoustics LLC | CGC2 | 2011 | Active |
| Pacific NW Landscape & Tree Services LLC | RGC | 2019 | Active |
| Pacific One Floors LLC | CGC2 | 2024 | Active |
| Pacific Paint Northwest Inc | RGC | 2014 | Active |
| Pacific Partitions Commercial LLC | CGC2 | 2018 | Active |
| Pacific Proform LLC | RGC | 2021 | Active |
| Pacific Project Services LLC | RGC | 2026 | Active |
| Pacific Renovators LLC | RGC | 2020 | Renew by Dec 16, 2026 |
| Pacific Ridge Roofing & Exteriors LLC | RGC | 2021 | Active |
| Pacific Service Hub LLC | RGC | 2024 | Active |
| Pacific Silver Home Repair LLC | RGC | 2026 | Active |
| Pacific West Homes & Renovations LTD | RGC + LBPR | 2018 | Renew by Nov 17, 2026 |
| Pacific Western Construction Inc | RGC | 2023 | Active |