| 1 | 26 | May 2015 | Portolá Camp: October 24-26 | Missing | San Mateo | |
| 2 | 23 | Oct 2015 | Portolá Camp: October 23 | None | San Mateo | |
| 3 | 21 | Apr 2015 | Portolá Camp: October 28-29 | None | San Mateo | |
| 4 | 375 | Apr 2015 | Tunitas Beach Indian Village | None | San Mateo | |
| 5 | 94 | Apr 2015 | Portolá Camp: November 5 | None | San Mateo | |
| 6 | 22 | Apr 2015 | Portolá Camp: October 27 | None | San Mateo | |
| 7 | 886 | Apr 2015 | Carolands | None | San Mateo | |
| 8 | 939.8 | Jan 2015 | Capidro | None | San Mateo | |
| 9 | 25 | May 2015 | Portolá Camp: October 30 | None | San Mateo | |
| 10 | 92 | Apr 2015 | Portolá Camp: November 11, Pulgas Water Temple | None | San Mateo | |
| 11 | 934.09 | Apr 2015 | Temporary Detention Camp for Japanese Americans/Tanofran Assembly Center | Other | San Mateo | |
| 12 | 343 | Oct 2015 | Old Store at La Honda | Other | San Mateo | |
| 13 | 955 | Jan 2015 | Southern Pacific Depot: Menlo Park | State | San Mateo | |
| 14 | 27 | Apr 2015 | Portolá Camp: November 4 | State | San Mateo | |
| 15 | 906 | Oct 2015 | Steele Brothers Dairy Ranches | State | San Mateo | |
| 16 | 930 | Oct 2015 | Pigeon Point Lighthouse | State | San Mateo | |
| 17 | 856 | Apr 2015 | Ralston Hall | State | San Mateo | |
| 18 | 907 | Jan 2015 | Filoli | State | San Mateo | |
| 19 | 909 | Apr 2015 | Our Lady of the Wayside | State | San Mateo | |
| 20 | 816 | Apr 2015 | Union Cemetery | State | San Mateo | |
| 21 | 391 | Apr 2015 | Sánchez Adobe | State | San Mateo | |
| 22 | 474 | Apr 2015 | Searsville Site | State | San Mateo | |
| 23 | 478 | Apr 2015 | Site of San Mateo County's First Sawmill | State | San Mateo | |
| 24 | 949 | Oct 2015 | First Congregational Church of Pescadero | State | San Mateo | |
| 25 | 19 | Apr 2015 | Broderick-Terry Duel | State | San Mateo | |
| 26 | 47 | Apr 2015 | Anza Expedition Camp June 24-27 | State | San Mateo | |
| 27 | 825 | Apr 2015 | Casa de Tableta | State | San Mateo | |
| 28 | 2 | Jan 2015 | Portolá Journey's End | State | San Mateo | |
| 29 | 846 | Apr 2015 | Southern Pacific Depot: Burlingame | State | San Mateo | |
| 30 | 48 | Mar 2017 | Anza Expedition Camp March 26 | State | San Mateo | |
| 31 | 393 | Apr 2015 | Hospice (Mission Dolores Outpost) | State | San Mateo | |
| 32 | 394 | Oct 2015 | San Francisco Bay Discovery Site Plaque | State | San Mateo | |
| 33 | 93 | Apr 2015 | Woodside Store | State | San Mateo | |
| 34 | 24 | May 2015 | Portolá Camp: October 31 | State | San Mateo | |
