| Maintain It! Construction LLC | RGC | 2015 | Active |
| Majestic Heating & Air Conditioning Inc | RGC | 2007 | Active |
| Major League Drain Cleaning LLC | RGC | 2025 | Active |
| Mammoth Gutter Co LLC | RGC | 2026 | Active |
| Mannys Construction Services LLC | RGC | 2020 | Active |
| Marengo Ventures LLC | RGC | 2024 | Active |
| Martymar Construction Incorporated | RGC | 2022 | Active |
| Mataus Designs LLC | RGC | 2025 | Active |
| Mathson Construction & Design LLC | RGC | 2015 | Active |
| McCall Co Heating And Air Conditioning LLC | RGC | 2018 | Renew by Dec 14, 2026 |
| McClain Construction LLC | CGC2, RGC | 2019 | Active |
| McCormicks Paint & Land Services LLC | RGC | 2026 | Active |
| McGuire Fence And Deck LLC | RGC | 2016 | Active |
| McIntyre Construction Inc | CGC1, RGC | 1972 | Active |
| McKenzie Commercial Contractors Inc | CGC1 | 1984 | Active |
| McKenzie Excavating Inc | CGC2, RGC | 1997 | Active |
| McKenzie Surfaces LLC | RGC | 2014 | Renew by Dec 18, 2026 |
| McLaughlin Plastering Inc | RGC | 1990 | Active |
| McLennan Construction Inc | RGC | 2002 | Active |
| MDS General Contracting LLC | RGC | 2026 | Active |
| Meadowlark Construction Inc | RGC | 2021 | Active |
| Measure Twice Home Services LLC | RGC | 2024 | Active |
| Meili Construction Co | CGC1, RGC | 1990 | Active |
| Meltebeke Built Paradise Homes Inc | CGC2, RGC | 1972 | Active |
| Meps Inc | RGC | 1993 | Active |
| Mercury Equipment Inc | CGC2, RGC | 2025 | Active |
| Metal Building Structures Inc | RGC | 2004 | Active |
| Mexplus Construction LLC | RGC | 2024 | Active |
| MG General Contractor LLC | RGC | 2025 | Active |
| Mica McOmber Construction Inc | RGC | 2010 | Active |
| Michael Gramzow Construction LLC | RGC | 2003 | Active |
| Michael Hiatt Construction LLC | RGC | 2002 | Active |
| Michael Hill Construction LLC | RGC | 2025 | Renew by Nov 4, 2026 |
| Michael K Paden LLC | RGC | 2019 | Active |
| Michael Scnear Contracting LLC | CGC2, RGC | 2018 | Active |
| Mid Valley LLC | CGC1, RGC | 2003 | Active |
| Middletons Enterprises LLC | RGC | 2025 | Active |
| Midgleys Chimney Sweep & Repair Inc | RGC | 2007 | Active |
| Miille Power Construction LLC | RGC | 2025 | Active |
| Mikaels Custom Building LLC | RGC | 2020 | Active |
| Mike Gansen Construction Company | RGC | 2019 | Active |
| Mike Hughes Construction LLC | RGC | 2013 | Active |
| Miles Excavation LLC | RGC | 2023 | Active |
| Miner Improvements LLC | RGC | 2024 | Active |
| Monster Bros Painting & Construction, LLC | RGC | 2026 | Active |
| Moon Mountain Contracting LLC | RGC | 2020 | Active |
| Moreno Legacy Construction LLC | RGC | 2025 | Active |
| Moriguchi Construction LLC | RGC | 2025 | Active |
| Morley Homes Inc | RGC | 2016 | Active |
| Morningstar Designs LLC | RGC | 2023 | Active |
| Morrow & Sons LLC | RGC | 2024 | Renew by Dec 26, 2026 |
| Motley Construction LLC | RGC | 2023 | Active |
| MTB Contractor LLC | RGC | 2026 | Active |
| Multi Contracting LLC | CGC1, RGC | 2022 | Active |
| Mystic Landscaping LLC | RGC | 2025 | Active |
| Nance Tile & Design LLC | RGC | 2021 | Active |
| Nates Home Improvement Solutions LLC | RGC | 2017 | Active |
| Nathans Woodworks Inc | RGC | 2016 | Active |
| National Roofing And Construction Inc | CGC2, RGC | 2023 | Active |
| Nationwide Builders LLC | RGC | 2022 | Active |
| New Moon Remodeling LLC | RGC | 2026 | Active |
| New Oregon Style Construction LLC | RGC | 2026 | Active |
| Next Level Carpentry LLC | RGC | 2025 | Active |
| Noah T Lacey Construction LLC | RGC | 2017 | Active |
| Nordic Homes & Construction LLC | RGC | 2003 | Active |
| North Rim Audio Video LLC | RGC | 2020 | Active |
| Northwest Cable Corp | RGC | 2003 | Active |
| Northwest Pool & Spa LLC | CGC2, RGC | 2004 | Active |
| Northwest Quality Finishes LLC | RGC | 2022 | Active |
| Norwest Builders Inc | RGC | 2011 | Active |
| Nowhaus LLC | RGC | 2012 | Active |
| NP Construction LLC | RGC | 2004 | Active |
| Nugent Enterprises Inc | RGC | 2015 | Active |
| NW Project Pro LLC | RGC | 2022 | Active |
| O & D Enterprises LLC | RGC | 2024 | Active |
| Octobie Inc | RGC | 2020 | Active |
| Ojeg Construction LLC | CGC2, RGC | 2019 | Active |
| Oldham Crane Service Inc | CGC2 | 1990 | Active |
| Olive Home Interiors LLC | RGC | 2024 | Active |
| Olympus Technologies Inc | CGC2 | 1994 | Active |
| Omni Renovation LLC | RGC | 2022 | Active |
| On Demand Handyman LLC | RGC | 2025 | Active |
| On Track Brush Control LLC | RGC | 2026 | Active |
| One Nail At A Time LLC | RGC | 2013 | Active |
| One Stop Craftsman LLC | RGC | 2024 | Active |
| Onyx Builders LLC | RGC | 2021 | Active |
| Orange Star Construction LLC | RGC | 2021 | Active |
| Ordell Construction LLC | CGC1, RGC | 2007 | Active |
| Oregon Community Renewables LLC | CGC1, RGC | 2023 | Active |
| Oregon Drywall Systems Inc | RGC | 1993 | Active |
| Oregon Electric Service LLC | CGC2, RGC | 2008 | Active |
| Oregon Excavating Inc | CGC2 | 1994 | Active |
| Oregon Glass Systems LLC | RGC | 2026 | Active |
| Oregon Real Estate Construction LLC | RGC | 2018 | Active |
| Oregon Roofing And Gutters LLC | RGC | 2026 | Active |
| Oregon Water Services Inc | CGC2, RGC | 1999 | Active |
| Oregon Woods Inc | CGC1 | 1994 | Active |
| Oregonscapes Pro Services LLC | RGC | 2023 | Active |
| Otero Construction LLC | RGC | 2025 | Active |
| Otter Way Construction LLC | RGC | 2004 | Active |