San Mateo County · 2026 General Likely Voters
Pick a jurisdiction — countywide first, then every political geography · universe as of 2026-08-25 · not election results
San Mateo County — Countywide
195,786 voted in the 2026 Primary · 323,747 likely General Election voters
+65.4% more likely voters than 26P turnout
Congressional Districts · 2
State Senate Districts · 2
State Assembly Districts · 3
Assembly District 21
full district
+66.1% more likely voters than 26P turnout · D+44.8 → D+42.6
Assembly District 23
full district · spans 2 counties
+63.4% more likely voters than 26P turnout · D+42.9 → D+40.9
Assembly District 19
full district · spans 2 counties
+57.4% more likely voters than 26P turnout · D+57.2 → D+53.6
Supervisorial Districts · 5
Supervisorial District 3
+52.1% more likely voters than 26P turnout · D+43.8 → D+42.0
Supervisorial District 2
+64.7% more likely voters than 26P turnout · D+44.5 → D+42.2
Supervisorial District 1
+72.1% more likely voters than 26P turnout · D+40.7 → D+38.8
Supervisorial District 4
+66.3% more likely voters than 26P turnout · D+51.2 → D+48.6
Supervisorial District 5
+82.6% more likely voters than 26P turnout · D+46.1 → D+44.5
Cities · 21
City of San Mateo
+65.6% more likely voters than 26P turnout · D+46.0 → D+43.7
City of Redwood City
+59.1% more likely voters than 26P turnout · D+48.3 → D+45.9
City of Daly City
+88.3% more likely voters than 26P turnout · D+46.8 → D+45.3
Unincorporated
+54.9% more likely voters than 26P turnout · D+46.4 → D+44.7
City of South San Francisco
+79.1% more likely voters than 26P turnout · D+46.4 → D+44.5
City of Pacifica
+55.3% more likely voters than 26P turnout · D+47.2 → D+44.5
City of San Carlos
+51.9% more likely voters than 26P turnout · D+45.2 → D+43.9
City of San Bruno
+76.7% more likely voters than 26P turnout · D+43.1 → D+41.2
City of Menlo Park
+60.0% more likely voters than 26P turnout · D+51.4 → D+48.5
City of Burlingame
+65.8% more likely voters than 26P turnout · D+43.8 → D+41.4
City of Foster City
+69.6% more likely voters than 26P turnout · D+38.9 → D+36.6
City of Belmont
+56.8% more likely voters than 26P turnout · D+45.4 → D+43.1
City of Millbrae
+72.9% more likely voters than 26P turnout · D+33.4 → D+31.3
City of Half Moon Bay
+43.7% more likely voters than 26P turnout · D+42.4 → D+40.8
City of East Palo Alto
+118.3% more likely voters than 26P turnout · D+65.6 → D+58.2
City of Hillsborough
+64.9% more likely voters than 26P turnout · D+19.5 → D+19.4
City of Atherton
+63.4% more likely voters than 26P turnout · D+18.9 → D+20.9
City of Woodside
+53.1% more likely voters than 26P turnout · D+25.4 → D+26.6
City of Portola Valley
+46.7% more likely voters than 26P turnout · D+42.5 → D+41.5
City of Brisbane
+58.2% more likely voters than 26P turnout · D+53.9 → D+50.1
City of Colma
+76.4% more likely voters than 26P turnout · D+51.2 → D+46.7
City Council Districts · 60
San Mateo Council District 1
+57.9% more likely voters than 26P turnout · D+43.4 → D+40.8
San Mateo Council District 5
+58.0% more likely voters than 26P turnout · D+41.5 → D+39.8
San Mateo Council District 3
+70.3% more likely voters than 26P turnout · D+49.9 → D+47.7
Redwood City Council District 7
+45.7% more likely voters than 26P turnout · D+44.0 → D+42.2
San Mateo Council District 4
+80.5% more likely voters than 26P turnout · D+46.6 → D+44.5
San Mateo Council District 2
+70.7% more likely voters than 26P turnout · D+52.4 → D+48.3
Redwood City Council District 6
+47.0% more likely voters than 26P turnout · D+49.5 → D+47.1
South San Francisco Council District 4
+66.2% more likely voters than 26P turnout · D+43.3 → D+40.9
South San Francisco Council District 2
+85.7% more likely voters than 26P turnout · D+44.7 → D+43.2
Redwood City Council District 1
+69.3% more likely voters than 26P turnout · D+37.6 → D+36.7
Pacifica Council District 4
+50.0% more likely voters than 26P turnout · D+43.7 → D+42.1
South San Francisco Council District 1
+77.5% more likely voters than 26P turnout · D+48.2 → D+46.1
San Bruno Council District 3
+71.4% more likely voters than 26P turnout · D+42.2 → D+39.8
Redwood City Council District 5
+58.2% more likely voters than 26P turnout · D+50.0 → D+46.9
Pacifica Council District 5
+49.5% more likely voters than 26P turnout · D+44.9 → D+41.5
South San Francisco Council District 3
+79.3% more likely voters than 26P turnout · D+47.1 → D+46.1
San Bruno Council District 1
+74.3% more likely voters than 26P turnout · D+41.6 → D+40.9
Pacifica Council District 3
+50.5% more likely voters than 26P turnout · D+51.2 → D+47.0
San Bruno Council District 2
+67.9% more likely voters than 26P turnout · D+42.2 → D+40.0
South San Francisco Council District 5
+93.3% more likely voters than 26P turnout · D+51.3 → D+48.0
Redwood City Council District 2
+65.9% more likely voters than 26P turnout · D+54.7 → D+51.4
Menlo Park Council District 5
+55.1% more likely voters than 26P turnout · D+41.2 → D+39.9
Pacifica Council District 2
+59.1% more likely voters than 26P turnout · D+50.5 → D+46.2
Menlo Park Council District 4
+57.5% more likely voters than 26P turnout · D+48.9 → D+46.7
Menlo Park Council District 2
+50.4% more likely voters than 26P turnout · D+58.9 → D+55.1
Belmont Council District 3
+54.1% more likely voters than 26P turnout · D+47.9 → D+45.2
Belmont Council District 4
+55.7% more likely voters than 26P turnout · D+40.9 → D+39.8
Belmont Council District 2
+50.2% more likely voters than 26P turnout · D+45.8 → D+45.0
Burlingame Council District 3
+58.6% more likely voters than 26P turnout · D+44.8 → D+43.6
Menlo Park Council District 3
+57.0% more likely voters than 26P turnout · D+53.2 → D+49.6
Pacifica Council District 1
+77.5% more likely voters than 26P turnout · D+47.0 → D+46.9
Redwood City Council District 3
+88.8% more likely voters than 26P turnout · D+53.9 → D+50.4
Foster City Council District 4
+73.3% more likely voters than 26P turnout · D+36.4 → D+34.8
San Bruno Council District 4
+105.5% more likely voters than 26P turnout · D+48.8 → D+45.4
Burlingame Council District 4
+60.8% more likely voters than 26P turnout · D+45.6 → D+41.6
Foster City Council District 1
+61.8% more likely voters than 26P turnout · D+42.1 → D+37.9
Redwood City Council District 4
+74.7% more likely voters than 26P turnout · D+59.3 → D+54.8
Burlingame Council District 5
+68.3% more likely voters than 26P turnout · D+45.4 → D+41.8
Foster City Council District 5
+66.2% more likely voters than 26P turnout · D+40.8 → D+38.8
Belmont Council District 1
+73.1% more likely voters than 26P turnout · D+48.0 → D+42.3
Burlingame Council District 2
+67.1% more likely voters than 26P turnout · D+48.3 → D+45.5
Foster City Council District 2
+69.1% more likely voters than 26P turnout · D+38.0 → D+34.8
Millbrae Council District 4
+70.0% more likely voters than 26P turnout · D+28.6 → D+29.0
Millbrae Council District 1
+69.3% more likely voters than 26P turnout · D+35.0 → D+32.6
Foster City Council District 3
+80.1% more likely voters than 26P turnout · D+36.9 → D+37.0
Burlingame Council District 1
+80.5% more likely voters than 26P turnout · D+31.9 → D+32.4
Millbrae Council District 5
+76.8% more likely voters than 26P turnout · D+30.4 → D+27.7
Menlo Park Council District 1
+110.7% more likely voters than 26P turnout · D+63.2 → D+55.4
Millbrae Council District 2
+74.0% more likely voters than 26P turnout · D+37.7 → D+35.1
Millbrae Council District 3
+76.5% more likely voters than 26P turnout · D+37.0 → D+33.1
Half Moon Bay Council District 4
+38.4% more likely voters than 26P turnout · D+37.2 → D+35.3
Half Moon Bay Council District 3
+39.6% more likely voters than 26P turnout · D+48.9 → D+47.3
Half Moon Bay Council District 1
+45.2% more likely voters than 26P turnout · D+41.0 → D+41.1
Half Moon Bay Council District 5
+44.4% more likely voters than 26P turnout · D+46.6 → D+42.9
Half Moon Bay Council District 2
+55.0% more likely voters than 26P turnout · D+38.7 → D+37.8
Woodside Council District 1
+59.9% more likely voters than 26P turnout · D+30.3 → D+30.8
Woodside Council District 4
+55.5% more likely voters than 26P turnout · D+17.6 → D+21.8
Woodside Council District 3
+51.0% more likely voters than 26P turnout · D+22.0 → D+22.1
Woodside Council District 2
+53.9% more likely voters than 26P turnout · D+27.7 → D+26.3
Woodside Council District 5
+45.0% more likely voters than 26P turnout · D+29.0 → D+31.9
Community College Districts · 5
San Mateo Community College District Trustee Area 1
+52.4% more likely voters than 26P turnout · D+44.0 → D+42.1
San Mateo Community College District Trustee Area 3
+71.8% more likely voters than 26P turnout · D+39.7 → D+38.0
San Mateo Community College District Trustee Area 4
+64.1% more likely voters than 26P turnout · D+44.7 → D+42.5
San Mateo Community College District Trustee Area 5
+65.5% more likely voters than 26P turnout · D+50.9 → D+48.4
San Mateo Community College District Trustee Area 2
+84.3% more likely voters than 26P turnout · D+47.9 → D+45.9
Unified School Districts · 11
So San Francisco Unified School District Trustee Area C
+71.3% more likely voters than 26P turnout · D+43.5 → D+42.0
So San Francisco Unified School District Trustee Area B
+82.0% more likely voters than 26P turnout · D+45.1 → D+43.8
So San Francisco Unified School District Trustee Area a
+81.1% more likely voters than 26P turnout · D+45.8 → D+45.0
So San Francisco Unified School District Trustee Area E
+89.4% more likely voters than 26P turnout · D+51.0 → D+47.5
So San Francisco Unified School District Trustee Area D
+76.0% more likely voters than 26P turnout · D+47.5 → D+46.0
Cabrillo Unified School District Trustee Area B
+40.3% more likely voters than 26P turnout · D+48.8 → D+44.4
Cabrillo Unified School District Trustee Area a
+39.8% more likely voters than 26P turnout · D+54.9 → D+50.6
Cabrillo Unified School District Trustee Area D
+45.9% more likely voters than 26P turnout · D+42.6 → D+40.8
Cabrillo Unified School District Trustee Area E
+44.3% more likely voters than 26P turnout · D+35.5 → D+34.1
Cabrillo Unified School District Trustee Area C
+49.5% more likely voters than 26P turnout · D+43.0 → D+41.9
La Honda-Pescadero Unified School District
+48.9% more likely voters than 26P turnout · D+38.0 → D+38.4
High School Districts · 11
Jefferson Union High School District
+72.2% more likely voters than 26P turnout · D+47.6 → D+45.3
Sequoia Union High School District Trustee Area C
+50.5% more likely voters than 26P turnout · D+41.4 → D+40.1
Sequoia Union High School District Trustee Area B
+51.8% more likely voters than 26P turnout · D+45.5 → D+44.1
San Mateo Union High School District Trustee Area 3
+58.3% more likely voters than 26P turnout · D+37.4 → D+35.6
San Mateo Union High School District Trustee Area 2
+68.1% more likely voters than 26P turnout · D+39.2 → D+36.8
Sequoia Union High School District Trustee Area D
+60.4% more likely voters than 26P turnout · D+49.5 → D+47.2
Sequoia Union High School District Trustee Area A
+63.0% more likely voters than 26P turnout · D+46.3 → D+43.8
San Mateo Union High School District Trustee Area 5
+71.4% more likely voters than 26P turnout · D+41.8 → D+39.6
San Mateo Union High School District Trustee Area 4
+71.0% more likely voters than 26P turnout · D+50.7 → D+47.5
San Mateo Union High School District Trustee Area 1
+77.4% more likely voters than 26P turnout · D+42.3 → D+40.3
Sequoia Union High School District Trustee Area E
+110.0% more likely voters than 26P turnout · D+61.9 → D+56.3
Elementary School Districts · 37
Jefferson Elementary School District
+88.2% more likely voters than 26P turnout · D+47.0 → D+45.4
Pacifica Elementary School District
+55.1% more likely voters than 26P turnout · D+47.4 → D+44.5
San Carlos Elementary School District
+52.1% more likely voters than 26P turnout · D+46.5 → D+45.1
Menlo Park Elementary School District
+56.3% more likely voters than 26P turnout · D+47.5 → D+45.1
San Mateo-Foster City Elementary School District Trustee Area 3
+56.5% more likely voters than 26P turnout · D+42.6 → D+40.4
Redwood Elementary School District Trustee Area 1
+44.9% more likely voters than 26P turnout · D+42.9 → D+41.1
San Mateo-Foster City Elementary School District Trustee Area 5
+62.7% more likely voters than 26P turnout · D+45.6 → D+43.7
Millbrae Elementary School District
+75.9% more likely voters than 26P turnout · D+34.3 → D+32.2
San Mateo-Foster City Elementary School District Trustee Area 1
+69.9% more likely voters than 26P turnout · D+39.3 → D+36.6
San Mateo-Foster City Elementary School District Trustee Area 2
+77.9% more likely voters than 26P turnout · D+44.7 → D+42.9
Redwood Elementary School District Trustee Area 3
+54.0% more likely voters than 26P turnout · D+42.8 → D+41.1
San Mateo-Foster City Elementary School District Trustee Area 4
+67.2% more likely voters than 26P turnout · D+52.7 → D+49.0
Ravenswood Elementary School District
+115.2% more likely voters than 26P turnout · D+65.1 → D+57.4
Redwood Elementary School District Trustee Area 2
+59.7% more likely voters than 26P turnout · D+53.6 → D+50.7
Las Lomitas Elementary School District
+55.3% more likely voters than 26P turnout · D+43.9 → D+42.8
Redwood Elementary School District Trustee Area 4
+71.5% more likely voters than 26P turnout · D+51.4 → D+48.9
Redwood Elementary School District Trustee Area 5
+86.7% more likely voters than 26P turnout · D+52.8 → D+51.7
Hillsborough Elementary School District
+65.0% more likely voters than 26P turnout · D+19.5 → D+19.5
Belmont-Redwood Shores Elementary School District Trustee Area 1
+49.4% more likely voters than 26P turnout · D+43.4 → D+42.4
Belmont-Redwood Shores Elementary School District Trustee Area 4
+69.4% more likely voters than 26P turnout · D+36.4 → D+35.5
Belmont-Redwood Shores Elementary School District Trustee Area 5
+61.8% more likely voters than 26P turnout · D+45.3 → D+42.5
Portola Valley Elementary School District
+46.6% more likely voters than 26P turnout · D+42.0 → D+42.0
San Bruno Elementary School District Trustee Area 4
+63.2% more likely voters than 26P turnout · D+40.8 → D+38.3
Belmont-Redwood Shores Elementary School District Trustee Area 2
+59.0% more likely voters than 26P turnout · D+45.1 → D+43.4
Brisbane Elementary School District
+59.9% more likely voters than 26P turnout · D+53.3 → D+50.0
Burlingame Elementary School District Trustee Area 1
+59.2% more likely voters than 26P turnout · D+41.6 → D+39.2
San Bruno Elementary School District Trustee Area 2
+69.1% more likely voters than 26P turnout · D+39.3 → D+37.3
Burlingame Elementary School District Trustee Area 3
+66.7% more likely voters than 26P turnout · D+48.7 → D+45.8
Belmont-Redwood Shores Elementary School District Trustee Area 3
+71.6% more likely voters than 26P turnout · D+44.5 → D+41.9
San Bruno Elementary School District Trustee Area 3
+80.9% more likely voters than 26P turnout · D+47.2 → D+45.1
Burlingame Elementary School District Trustee Area 5
+60.9% more likely voters than 26P turnout · D+45.6 → D+41.6
Burlingame Elementary School District Trustee Area 4
+68.3% more likely voters than 26P turnout · D+45.4 → D+41.8
San Bruno Elementary School District Trustee Area 1
+78.3% more likely voters than 26P turnout · D+40.2 → D+39.3
Burlingame Elementary School District Trustee Area 2
+81.1% more likely voters than 26P turnout · D+31.4 → D+32.6
San Bruno Elementary School District Trustee Area 5
+100.5% more likely voters than 26P turnout · D+49.3 → D+46.6
Woodside Elementary School District
+54.4% more likely voters than 26P turnout · D+31.1 → D+30.9
Bayshore Elementary School District
+91.8% more likely voters than 26P turnout · D+45.0 → D+42.8
Every card links to that jurisdiction's own page (shareable URL) with maps, composition tables, sub-geography breakdowns, and the AI summary. Congressional and legislative cards open the full cross-county district.