| Meteor | Seattle | WA |
| Metropolitan Investment | Seattle | WA |
| Metro Seattle | Seattle | WA |
| Meyerhouse Timber | Everett | WA |
| Midway | Vancouver | WA |
| Milne Fruit Products | Prosser | WA |
| Mission Bay | Vancouver | WA |
| M&M Plywood | Longview | WA |
| Mobil Oil | Ferndale | WA |
| Mobil Oil | Neptune Beach | WA |
| Mobil Oil | Tacoma | WA |
| Monsanto | Seattle | WA |
| Montesano Gymnasium | Montesano | WA |
| Morrison Mill | Anacortes | WA |
| Mount Lake Laboratory | Seattle | WA |
| Mount Street Vincent's Home | Seattle | WA |
| M & R Mills | Arlington | WA |
| Mt. Rainier Depot | Tacoma | WA |
| Mt. View Christian Center | Ridgefield | WA |
| Multi Care Health System | Tacoma | WA |
| Munda | Vancouver | WA |
| Mutual Light & Heat | Seattle | WA |
| Mutual Materials | Bellevue | WA |
| Nassuk Bay | Vancouver | WA |
| Nathan Eckstein Junior High School | Seattle | WA |
| National Bank Of Commerce | Centralia | WA |
| National Bank Of Commerce | Mercer Island | WA |
| National Bank Of Commerce | Seattle | WA |
| National Paper Products | Port Townsend | WA |
| National Pole & Treating | Everett | WA |
| National Realty | Tacoma | WA |
| Nationl Bank Of Commerce | Centralia | WA |
| Nehenta Bay | Vancouver | WA |
| New England Fish | Seattle | WA |
| New Providence Hospital | Seattle | WA |
| Nippon Paper Industries | Port Angeles | WA |
| Noise Control Of Seattle | Seattle | WA |
| Norkirk Elementary School | Kirkland | WA |
| Norkirk Elementary School | Seattle | WA |
| Norse Home | Seattle | WA |
| North Central High School | Spokane | WA |
| Northern Life Building | Seattle | WA |
| Northern Pacific Railroad | Parkwater | WA |
| Northern Pacific Railroad | Tacoma | WA |
| Northern Pacific Railroad | Centralia | WA |
| Northern Pacific Railroad | Auburn | WA |
| Northern Pacific Railroad | Seattle | WA |
| Northern Pacific Railroad | Roslyn | WA |
| Northern Pacific Railroad | Pasco | WA |
| Northern Pacific Railroad | Stampede | WA |
