| Marysville 172nd PH 1 LLC | CC-01 | 2023 | Active |
| Marysville 172nd PH 2 LLC | CC-01 | 2023 | Active |
| Mason Creek Capital LLC | CC-01 | 2023 | Active |
| Master Contractors LLC | CC-01 | 2019 | Active |
| Master Hue LLC | CC-01 | 2026 | Active |
| Mata Builders LLC | CC-01 | 2017 | Active |
| Matticus Construction LLC | CC-01 | 2026 | Active |
| Maudslien LLC | CC-01 | 2004 | Active |
| Maverick Specialty Contg LLC | CC-01 | 2021 | Active |
| Mawhinney Construction LLC | CC-01 | 2011 | Active |
| Max Heat LLC | CC-01 | 2018 | Active |
| May Renovations LLC | CC-01 | 2026 | Active |
| MBJ Contracting LLC | CC-01 | 2025 | Active |
| McConnell's Projects LLC | CC-01 | 2025 | Active |
| McGregor Door & Hardware LLC | CC-01 | 2005 | Active |
| McKeever Construction LLC | CC-01 | 2025 | Active |
| McKenzie Construction LLC | CC-01 | 2009 | Active |
| McKinstry Co LLC | CC-01 | 2006 | Active |
| McKinstry Essention LLC | CC-01 | 2013 | Active |
| McKinstry Stauffer Yang Const | CC-01 | 2022 | Active |
| McLauchlan Construction LLC | CC-01 | 1995 | Active |
| McLeod Enterprises LLC | CC-01 | 2009 | Active |
| McNamara Industries Inc | CC-01 | 1997 | Active |
| MCR Construction Inc | CC-01 | 2015 | Active |
| McRae Theater Equipment Inc | CC-01 | 2022 | Active |
| MD Landscaping LLC | CC-01 | 2023 | Active |
| MD Remodel & Repair LLC | CC-01 | 2024 | Active |
| Mead Contracting Company | CC-01 | 2017 | Active |
| Medawar & Co Construction LLC | CC-01 | 2006 | Active |
| Medawar Maintenance LLC | CC-01 | 2023 | Active |
| Mega Mushroom LLC | CC-01 | 2024 | Active |
| Mehrer Drywall Inc | CC-01 | 1968 | Active |
| Mel Big Aldana Cncte Sltns LLC | CC-01 | 2022 | Active |
| Memo's Quality Const/Rmdlg LLC | CC-01 | 2021 | Active |
| Mendez Construction Group LLC | CC-01 | 2025 | Active |
| Merhawi General Const Co | CC-01 | 2026 | Active |
| Merit Construction Group LLC | CC-01 | 2025 | Active |
| Merit Remodel LLC | CC-01 | 2018 | Renew by Nov 20, 2026 |
| Merlino Properties | CC-01 | 2018 | Renew by Dec 6, 2026 |
| Metabuilt LLC | CC-01 | 2022 | Active |
| Method Construction Inc | CC-01 | 2006 | Active |
| Method Contracting LLC | CC-01 | 2009 | Active |
| Metis Construction Inc | CC-01 | 2009 | Active |
| Metrix Construction Inc | CC-01 | 2019 | Active |
| Metro Painting LLC | CC-01 | 2002 | Active |
| Metropolitan Contracting LLC | CC-01 | 2003 | Active |
| Metropolitan Finish Co LLC | CC-01 | 2010 | Active |
| Metropolitan Sewer Service LLC | CC-01 | 2008 | Active |
| MG Exteriors LLC | CC-01 | 2024 | Active |
| MG Remodeling & Const LLC | CC-01 | 2026 | Active |
| MGD Design Build LLC | CC-01 | 2023 | Active |
| MGT Builds Inc | CC-01 | 2020 | Active |
| Mh7 Consulting LLC | CC-01 | 2026 | Active |
| MHC Builds LLC | CC-01 | 2017 | Active |
| Michael Muro Garden Design | CC-01 | 2011 | Active |
| Mickey The Maintenance Man LLC | CC-01 | 2020 | Active |
| Microcontractor LLC | CC-01 | 2019 | Active |
| Mighty House Construction | CC-01 | 2009 | Active |
| Migue's Restoration LLC | CC-01 | 2017 | Active |
| Mike Cain Construction LLC | CC-01 | 2018 | Active |
| Mike Triol Construction LLC | CC-01 | 2026 | Active |
| Mike's Concrete | CC-01 | 2022 | Active |
| Miles Ahead Construction, LLC | CC-01 | 2025 | Active |
| Miles Construction NW LLC | CC-01 | 2005 | Active |
| Miller Ventures LLC | CC-01 | 2017 | Active |
| Milo Remodels & Repairs LLC | CC-01 | 2020 | Renew by Dec 13, 2026 |
| Minhhoang Construction LLC | CC-01 | 2018 | Active |
| Mint Build LLC | CC-01 | 2013 | Active |
| Miovic Reinhardt Associates | CC-01 | 2013 | Active |
| Miracle Playsystems | CC-01 | 2024 | Active |
| Mirikmog LLC | CC-01 | 2026 | Active |
| Mitchell Building Company | CC-01 | 2000 | Active |
| MJ Northwest Construction LLC | CC-01 | 2021 | Active |
| MK Home Services LLC | CC-01 | 2023 | Active |
| MKG Development LLC | CC-01 | 2020 | Active |
| Mnbe Construction & Dev LLC | CC-01 | 2023 | Active |
| Mocore LLC | CC-01 | 2006 | Active |
| Mode Contracting LLC | CC-01 | 2010 | Active |
| Modelremodel LLC | CC-01 | 2003 | Active |
| Modern Carpentry LLC | CC-01 | 2019 | Active |
| Modern Masonry & Wtrprfng LLC | CC-01 | 2026 | Active |
| Modern Restoration | CC-01 | 2025 | Active |
| Modern Shelter LLC | CC-01 | 2024 | Active |
| Modero Services | CC-01 | 2026 | Active |
| Mohler Design LLC | CC-01 | 2007 | Active |
| Mome Build | CC-01 | 2025 | Active |
| Moment Home Builders | CC-01 | 2026 | Active |
| Momentum Inc | CC-01 | 2007 | Active |
| Mooney Construction Co LLC | CC-01 | 2016 | Active |
| Moreno Painting LLC | CC-01 | 2026 | Active |
| Morgan Street Builders Inc | CC-01 | 2004 | Active |
| Morina Homes Corp | CC-01 | 2016 | Renew by Dec 28, 2026 |
| Mount Baker Remodeling LLC | CC-01 | 2008 | Active |
| Mountain Top Builders LLC | CC-01 | 2009 | Active |
| MP Services Inc | CC-01 | 1999 | Active |
| Mr Post LLC | CC-01 | 2023 | Active |
| Mr Services LLC | CC-01 | 2018 | Active |
| MRB Construction LLC | CC-01 | 2026 | Active |
| MRN Homes LLC | CC-01 | 2012 | Active |
| MSD Painting LLC | CC-01 | 2016 | Active |