Senate District 13 consists of the remainder of San Mateo County south of Senate District 11 and northern Santa Clara County, including the sister cities of Mountain View and Sunnyvale. This district keeps the San Mateo coastline from Pacifica to the Ano Nuevo State Reserve and peninsula cities from South San Francisco to Sunnyvale together. South San Francisco is the only city split to achieve population equality.
Map of Senate District 13 (PDF)
2020 Census Population
| Name | Count | Percent |
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| Total Population (POP) | 1,012,486 | 100.00% |
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| POP Hispanic or Latino | 196,754 | 19.43% |
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| POP Not Hispanic or Latino (NH) | 815,732 | 80.57% |
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| POP NH Population of one race | 761,321 | 75.19% |
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| POP NH White alone | 429,262 | 42.40% |
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| POP NH Black or African American alone | 17,394 | 1.72% |
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| POP NH Asian alone | 297,631 | 29.40% |
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| POP NH American Indian and Alaska Native alone | 1,253 | 0.12% |
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| POP NH Native Hawaiian and Other Pacific Islander alone | 8,593 | 0.85% |
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| POP NH Some Other Race alone | 7,188 | 0.71% |
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| POP NH Population of two or more races | 54,411 | 5.37% |
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Counties In District
| Name | Count | Percent |
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| San Mateo | 618,099 | 80.75% |
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| Santa Clara | 394,391 | 20.33% |
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Places In District
| Name | Count | Percent |
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| SAN MATEO: Atherton(C) | 7,194 | 100.00% |
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| SAN MATEO: Baywood Park(U) | 1,694 | 100.00% |
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| SAN MATEO: Belmont(C) | 28,361 | 100.00% |
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| SAN MATEO: Brisbane(C) | 4,858 | 100.00% |
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| SAN MATEO: Burlingame(C) | 31,416 | 100.00% |
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| SAN MATEO: East Palo Alto(C) | 30,139 | 100.00% |
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| SAN MATEO: El Granada(U) | 5,485 | 100.00% |
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| SAN MATEO: Emerald Lake Hills(U) | 4,410 | 100.00% |
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| SAN MATEO: Foster City(C) | 33,841 | 100.00% |
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| SAN MATEO: Half Moon Bay(C) | 11,814 | 100.00% |
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| SAN MATEO: Highlands(U) | 2,362 | 100.00% |
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| SAN MATEO: Hillsborough(C) | 11,393 | 100.00% |
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| SAN MATEO: Ladera(U) | 1,558 | 100.00% |
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| SAN MATEO: La Honda(U) | 980 | 100.00% |
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| SAN MATEO: Loma Mar(U) | 134 | 100.00% |
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| SAN MATEO: Menlo Park(C) | 33,830 | 100.00% |
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| SAN MATEO: Millbrae(C) | 23,227 | 100.00% |
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| SAN MATEO: Montara(U) | 2,838 | 100.00% |
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| SAN MATEO: Moss Beach(U) | 3,218 | 100.00% |
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| SAN MATEO: North Fair Oaks(U) | 14,064 | 100.00% |
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| SAN MATEO: Pacifica(C) | 38,674 | 100.00% |
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| SAN MATEO: Pescadero(U) | 595 | 100.00% |
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| SAN MATEO: Portola Valley(C) | 4,457 | 100.00% |
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| SAN MATEO: Redwood City(C) | 84,423 | 100.00% |
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| SAN MATEO: San Bruno(C) | 42,192 | 96.01% |
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| SAN MATEO: San Carlos(C) | 30,748 | 100.00% |
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| SAN MATEO: San Mateo(C) | 105,806 | 100.00% |
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| SAN MATEO: South San Francisco(C) | 33,172 | 50.12% |
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| SAN MATEO: West Menlo Park(U) | 3,934 | 100.00% |
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| SAN MATEO: Woodside(C) | 5,313 | 100.00% |
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| SAN MATEO: Remainder of San Mateo(R) | 15,969 | 90.88% |
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| SANTA CLARA: Campbell(C) | 44,028 | 100.00% |
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| SANTA CLARA: Cupertino(C) | 60,446 | 100.00% |
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| SANTA CLARA: Los Altos(C) | 31,668 | 100.00% |
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| SANTA CLARA: Los Altos Hills(C) | 8,501 | 100.00% |
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| SANTA CLARA: Los Gatos(C) | 33,585 | 100.00% |
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| SANTA CLARA: Loyola(U) | 3,498 | 100.00% |
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| SANTA CLARA: Monte Sereno(C) | 3,482 | 100.00% |
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| SANTA CLARA: Mountain View(C) | 82,486 | 100.00% |
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| SANTA CLARA: Palo Alto(C) | 68,654 | 100.00% |
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| SANTA CLARA: Saratoga(C) | 31,080 | 100.00% |
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| SANTA CLARA: Stanford(U) | 21,168 | 100.00% |
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| SANTA CLARA: Remainder of Santa Clara(R) | 5,795 | 20.52% |
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