California - Significance region: Local
| Mountain View Adobe |
| Mount Pleasant House |
| Mount Tamalpais Mountain Theater |
| Mount View Hotel |
| Moylan, Maj. Myles, House |
| Moyse Building |
| Muckenthaler House |
| Mud Creek Canyon |
| Muir Beach Archeological Site |
| Muir, John, Branch |
| Municipal Warehouse No. 1 |
| Munk, Walter and Judith, House |
| Murer House and Gardens |
| Murphy, D. J., House |
| Murphys Grammar School |
| Murphys Hotel |
| Murphy Well Corral |
| Mus-yeh-sait-neh Village and Cultural Landscape Property |
| Mutual Savings Bank Building |
| M.V. SANTA ROSA |
| Napa Abajo-Fuller Park Historic District |
| Napa County Courthouse Plaza |
| Napa County Infirmary |
| Napa Opera House |
| Napa River Bridge on Zinfandel Lane |
| Napa Valley Railroad Depot |
| National Bank of San Mateo |
| National Bank of Whittier Building |
| National Carbon Company Building |
| National Chicano Moratorium March August 29, 1970 |
| National Exchange Hotel |
| Natural Corral |
| Natural History Museum |
| Navarro |
| NCO Railway Depot |
| Nelson Ranch |
| Nelson Springs |
| Nesbitt, Sheriff William Joseph, House |
| Nevada Brewery |
| Nevada-California-Oregon Railway Co. General Office Building |
| Nevada City Firehouse No. 2 |
| Nevada City Free Public Library |
| Newcastle Portuguese Hall |
| New City of Mentalphysics Historic District |
| Newcomb House |
| New Fair Oaks Historic District |
| Newhall Estate |
| New Helvetia Historic District |
| New Hotel Carquinez |
| Newland House |
| New Lynn Theater |
| New Mission Theater |
| New Sequoia Theater Building |
| Niagara Camp |
| Nichelini Winery |
| Nicholson, Grace, Building |
| Niles Canyon Transcontinental Railroad Historic District |
| Nippon Hospital |
| Nisei VFW Post 8985 |
| Nisenan Village Site |
| North Beach Historic District |
| North Harper Avenue Historic District |
| North Hollywood Branch |
| North Sacramento School |
| North Shore Yacht Club |
| North Star House |
| North University Park Historic District |
| Norton, John, House |
| Noyes Mansion |
| Nursery School for Visually Handicapped Children |
| Oakland Auditorium |
| Oakland City Hall |
| Oakland Free Library-23rd Avenue Branch |
| Oakland Free Library-Alden Branch |
| Oakland Free Library-Golden Gate Branch |
| Oakland Free Library-Melrose Branch |
| Oakland Hotel |
| Oakland Iron Works-United Works, and the Remillard Brick Company |
| Oakland Lamp Works |
| Oakland Public Library |
| Oakland Waterfront Warehouse District |
| Oaklawn Bridge and Waiting Station |
| Oaks, The |
| Oakville Grocery |
| Oceanside City Hall and Fire Station |
| Octagon Building |
| Oddfellows Hall |
| Odd Fellows Hall |
| Odd Fellows Hall |
| Odd Fellows Hall |
| Odd Fellows Temple |
| O'Donnell, Thomas, House |
| Offerman, John, House |
| Ohlandt Newlyweds House |
| Ohm, John, House |
| Old Adobe Barn |
| Old Backs House |
| Old Bank of America Building |
| Old Borges Ranch |
| Old City Hall Building |
Data from United States Park Service and Wikidata
