Contra Costa County · 2026 General Likely Voters
Pick a jurisdiction — countywide first, then every political geography · universe as of 2026-08-25 · not election results
Contra Costa County — Countywide
329,510 voted in the 2026 Primary · 544,555 likely General Election voters
+65.3% more likely voters than 26P turnout
Congressional Districts · 3
Congressional District 10
full district · spans 2 counties
+60.4% more likely voters than 26P turnout · D+28.2 → D+27.3
Congressional District 8
full district · spans 5 counties
+71.5% more likely voters than 26P turnout · D+35.4 → D+33.9
Congressional District 9
full district · spans 2 counties
+98.4% more likely voters than 26P turnout · D+17.3 → D+19.3
State Senate Districts · 3
State Senate District 9
full district · spans 2 counties
+65.7% more likely voters than 26P turnout · D+34.4 → D+33.6
State Senate District 7
full district · spans 2 counties
+58.0% more likely voters than 26P turnout · D+69.7 → D+65.4
State Senate District 3
full district · spans 6 counties
+66.0% more likely voters than 26P turnout · D+26.5 → D+25.4
State Assembly Districts · 4
Assembly District 15
full district
+73.6% more likely voters than 26P turnout · D+32.0 → D+31.5
Assembly District 16
full district · spans 2 counties
+59.0% more likely voters than 26P turnout · D+27.4 → D+26.3
Assembly District 14
full district · spans 2 counties
+53.7% more likely voters than 26P turnout · D+69.3 → D+65.1
Assembly District 11
full district · spans 3 counties
+78.5% more likely voters than 26P turnout · D+20.2 → D+21.1
Supervisorial Districts · 5
Supervisorial District 2
+53.9% more likely voters than 26P turnout · D+27.1 → D+26.1
Supervisorial District 4
+61.0% more likely voters than 26P turnout · D+33.9 → D+32.6
Supervisorial District 3
+81.3% more likely voters than 26P turnout · D+18.2 → D+19.7
Supervisorial District 1
+61.4% more likely voters than 26P turnout · D+63.4 → D+59.2
Supervisorial District 5
+78.2% more likely voters than 26P turnout · D+40.7 → D+39.3
Cities · 20
Unincorporated
+63.4% more likely voters than 26P turnout · D+26.1 → D+25.9
City of Concord
+68.3% more likely voters than 26P turnout · D+33.1 → D+32.1
City of Antioch
+95.9% more likely voters than 26P turnout · D+36.7 → D+36.9
City of Richmond
+69.1% more likely voters than 26P turnout · D+66.7 → D+61.6
City of Walnut Creek
+48.7% more likely voters than 26P turnout · D+41.0 → D+38.5
City of San Ramon
+77.9% more likely voters than 26P turnout · D+27.4 → D+28.0
City of Brentwood
+70.6% more likely voters than 26P turnout · D+13.2 → D+13.4
City of Danville
+54.5% more likely voters than 26P turnout · D+13.1 → D+13.1
City of Pittsburg
+100.1% more likely voters than 26P turnout · D+46.8 → D+43.7
City of Martinez
+52.8% more likely voters than 26P turnout · D+34.2 → D+32.2
City of Oakley
+83.3% more likely voters than 26P turnout · D+15.9 → D+16.4
City of Pleasant Hill
+56.1% more likely voters than 26P turnout · D+39.7 → D+37.4
City of Lafayette
+34.0% more likely voters than 26P turnout · D+41.2 → D+39.2
City of El Cerrito
+32.2% more likely voters than 26P turnout · D+69.6 → D+66.8
City of Hercules
+72.4% more likely voters than 26P turnout · D+51.3 → D+48.8
City of Orinda
+50.1% more likely voters than 26P turnout · D+41.7 → D+40.8
City of Pinole
+59.3% more likely voters than 26P turnout · D+47.2 → D+45.4
City of Moraga
+35.3% more likely voters than 26P turnout · D+37.4 → D+35.4
City of San Pablo
+112.2% more likely voters than 26P turnout · D+59.6 → D+56.0
City of Clayton
+52.1% more likely voters than 26P turnout · D+11.8 → D+11.7
City Council Districts · 37
Antioch Council District 3
+93.5% more likely voters than 26P turnout · D+36.5 → D+36.7
Concord Council District 5
+59.9% more likely voters than 26P turnout · D+29.1 → D+27.7
Antioch Council District 4
+94.9% more likely voters than 26P turnout · D+40.7 → D+39.4
Concord Council District 1
+64.5% more likely voters than 26P turnout · D+30.3 → D+29.2
Concord Council District 4
+61.9% more likely voters than 26P turnout · D+31.9 → D+30.4
Concord Council District 2
+76.4% more likely voters than 26P turnout · D+38.8 → D+37.8
San Ramon Council District 2
+63.3% more likely voters than 26P turnout · D+21.3 → D+22.1
Brentwood Council District 3
+48.5% more likely voters than 26P turnout · D+15.5 → D+14.2
Antioch Council District 2
+93.1% more likely voters than 26P turnout · D+33.5 → D+34.8
San Ramon Council District 1
+68.2% more likely voters than 26P turnout · D+25.6 → D+26.0
San Ramon Council District 4
+86.1% more likely voters than 26P turnout · D+31.3 → D+31.3
Richmond Council District 4
+61.8% more likely voters than 26P turnout · D+60.8 → D+56.9
Richmond Council District 5
+56.5% more likely voters than 26P turnout · D+72.2 → D+65.8
San Ramon Council District 3
+107.9% more likely voters than 26P turnout · D+35.8 → D+34.6
Antioch Council District 1
+106.0% more likely voters than 26P turnout · D+34.3 → D+35.7
Richmond Council District 6
+59.1% more likely voters than 26P turnout · D+69.3 → D+64.2
Brentwood Council District 1
+74.3% more likely voters than 26P turnout · D+7.8 → D+11.0
Brentwood Council District 2
+90.1% more likely voters than 26P turnout · D+14.6 → D+15.6
Brentwood Council District 4
+87.3% more likely voters than 26P turnout · D+13.5 → D+12.7
Richmond Council District 2
+72.9% more likely voters than 26P turnout · D+61.6 → D+58.5
Martinez Council District 4
+46.7% more likely voters than 26P turnout · D+29.4 → D+28.7
Martinez Council District 3
+50.1% more likely voters than 26P turnout · D+35.2 → D+32.7
Concord Council District 3
+106.5% more likely voters than 26P turnout · D+43.7 → D+42.4
Richmond Council District 3
+86.4% more likely voters than 26P turnout · D+69.5 → D+64.5
Martinez Council District 2
+62.0% more likely voters than 26P turnout · D+31.7 → D+30.8
Martinez Council District 1
+55.3% more likely voters than 26P turnout · D+42.0 → D+37.6
Oakley Council District 4
+85.9% more likely voters than 26P turnout · D+22.7 → D+21.7
Pleasant Hill Council District 4
+47.9% more likely voters than 26P turnout · D+36.9 → D+33.9
Oakley Council District 3
+76.7% more likely voters than 26P turnout · D+8.7 → D+9.7
Pleasant Hill Council District 3
+50.1% more likely voters than 26P turnout · D+39.9 → D+38.3
Richmond Council District 1
+117.1% more likely voters than 26P turnout · D+67.9 → D+60.2
Pleasant Hill Council District 5
+53.4% more likely voters than 26P turnout · D+39.0 → D+36.9
Oakley Council District 1
+82.6% more likely voters than 26P turnout · D+11.7 → D+14.0
Oakley Council District 5
+93.4% more likely voters than 26P turnout · D+21.2 → D+21.8
Oakley Council District 2
+79.8% more likely voters than 26P turnout · D+16.3 → D+15.5
Pleasant Hill Council District 2
+72.7% more likely voters than 26P turnout · D+43.3 → D+40.5
Pleasant Hill Council District 1
+67.4% more likely voters than 26P turnout · D+41.3 → D+39.0
Community College Districts · 6
Contra Costa Community College District Trustee Area 2
+49.0% more likely voters than 26P turnout · D+37.7 → D+36.1
Contra Costa Community College District Trustee Area 4
+69.0% more likely voters than 26P turnout · D+14.6 → D+15.9
Contra Costa Community College District Trustee Area 3
+66.5% more likely voters than 26P turnout · D+33.6 → D+32.4
Contra Costa Community College District Trustee Area 1
+62.2% more likely voters than 26P turnout · D+64.0 → D+59.7
Contra Costa Community College District Trustee Area 5
+93.6% more likely voters than 26P turnout · D+31.7 → D+31.9
Chabot-Las Positas Community College District Trustee Area 7
+105.6% more likely voters than 26P turnout · D+22.9 → D+26.7
Unified School Districts · 28
Mt Diablo Unified School District Trustee Area 4
+54.8% more likely voters than 26P turnout · D+26.1 → D+25.9
West Contra Costa Unified School District Trustee Area 5
+35.9% more likely voters than 26P turnout · D+70.7 → D+67.2
Mt Diablo Unified School District Trustee Area 2
+53.6% more likely voters than 26P turnout · D+38.0 → D+35.9
Mt Diablo Unified School District Trustee Area 5
+63.5% more likely voters than 26P turnout · D+30.0 → D+28.7
West Contra Costa Unified School District Trustee Area 1
+66.9% more likely voters than 26P turnout · D+49.2 → D+47.3
West Contra Costa Unified School District Trustee Area 4
+69.4% more likely voters than 26P turnout · D+56.4 → D+53.2
Pittsburg Unified School District
+99.5% more likely voters than 26P turnout · D+49.3 → D+45.5
San Ramon Valley Unified School District Trustee Area 2
+53.6% more likely voters than 26P turnout · D+14.6 → D+15.0
Mt Diablo Unified School District Trustee Area 1
+88.6% more likely voters than 26P turnout · D+39.4 → D+38.0
San Ramon Valley Unified School District Trustee Area 1
+53.2% more likely voters than 26P turnout · D+2.9 → D+4.3
San Ramon Valley Unified School District Trustee Area 5
+66.7% more likely voters than 26P turnout · D+16.3 → D+18.1
Mt Diablo Unified School District Trustee Area 3
+83.9% more likely voters than 26P turnout · D+40.9 → D+39.8
San Ramon Valley Unified School District Trustee Area 4
+71.0% more likely voters than 26P turnout · D+24.4 → D+25.1
West Contra Costa Unified School District Trustee Area 2
+80.3% more likely voters than 26P turnout · D+69.4 → D+64.0
San Ramon Valley Unified School District Trustee Area 3
+107.9% more likely voters than 26P turnout · D+36.8 → D+35.3
West Contra Costa Unified School District Trustee Area 3
+118.5% more likely voters than 26P turnout · D+62.1 → D+57.0
Antioch Unified School District Trustee Area 2
+91.3% more likely voters than 26P turnout · D+32.5 → D+32.4
Antioch Unified School District Trustee Area 3
+97.2% more likely voters than 26P turnout · D+40.7 → D+39.6
Antioch Unified School District Trustee Area 4
+85.1% more likely voters than 26P turnout · D+32.1 → D+33.6
Antioch Unified School District Trustee Area 1
+97.2% more likely voters than 26P turnout · D+31.8 → D+32.8
Antioch Unified School District Trustee Area 5
+104.6% more likely voters than 26P turnout · D+38.8 → D+39.9
John Swett Unified School District
+73.6% more likely voters than 26P turnout · D+44.6 → D+42.9
Martinez Unified School District Trustee Area 5
+44.8% more likely voters than 26P turnout · D+25.7 → D+24.6
Martinez Unified School District Trustee Area 1
+53.3% more likely voters than 26P turnout · D+32.8 → D+30.0
Martinez Unified School District Trustee Area 4
+59.6% more likely voters than 26P turnout · D+26.7 → D+28.1
Martinez Unified School District Trustee Area 3
+63.9% more likely voters than 26P turnout · D+34.7 → D+32.1
Martinez Unified School District Trustee Area 2
+65.7% more likely voters than 26P turnout · D+33.9 → D+31.0
Livermore Valley Joint Unified School District Trustee Area 3
+42.7% more likely voters than 26P turnout · R+26.5 → R+22.8
High School Districts · 10
Acalanes Union High School District Trustee Area 2
+34.9% more likely voters than 26P turnout · D+42.6 → D+39.3
Acalanes Union High School District Trustee Area 4
+41.7% more likely voters than 26P turnout · D+37.8 → D+36.3
Liberty Union High School District ( Contra Costa ) Trustee Area 5
+57.1% more likely voters than 26P turnout · D+14.7 → D+14.7
Acalanes Union High School District Trustee Area 3
+36.2% more likely voters than 26P turnout · D+44.6 → D+42.9
Liberty Union High School District ( Contra Costa ) Trustee Area 4
+75.0% more likely voters than 26P turnout · R+5.1 → R+2.4
Acalanes Union High School District Trustee Area 5
+41.6% more likely voters than 26P turnout · D+40.8 → D+39.4
Liberty Union High School District ( Contra Costa ) Trustee Area 3
+80.0% more likely voters than 26P turnout · D+8.2 → D+9.0
Liberty Union High School District ( Contra Costa ) Trustee Area 2
+94.3% more likely voters than 26P turnout · D+15.0 → D+16.5
Liberty Union High School District ( Contra Costa ) Trustee Area 1
+78.4% more likely voters than 26P turnout · D+12.2 → D+13.1
Acalanes Union High School District Trustee Area 1
+67.9% more likely voters than 26P turnout · D+45.3 → D+41.1
Elementary School Districts · 13
Brentwood Union Elementary School District
+71.9% more likely voters than 26P turnout · D+13.2 → D+13.8
Walnut Creek Elementary School District
+46.5% more likely voters than 26P turnout · D+43.9 → D+40.5
Lafayette Elementary School District
+34.2% more likely voters than 26P turnout · D+41.3 → D+39.4
Orinda Union Elementary School District
+50.1% more likely voters than 26P turnout · D+41.6 → D+40.8
Moraga Elementary School District
+35.2% more likely voters than 26P turnout · D+37.1 → D+35.0
Byron Union Elementary School District
+71.1% more likely voters than 26P turnout · R+17.7 → R+13.9
Oakley Union Elementary School District Trustee Area 4
+98.2% more likely voters than 26P turnout · D+27.9 → D+26.9
Oakley Union Elementary School District Trustee Area 1
+74.2% more likely voters than 26P turnout · D+13.7 → D+13.3
Oakley Union Elementary School District Trustee Area 5
+72.9% more likely voters than 26P turnout · D+8.7 → D+8.6
Oakley Union Elementary School District Trustee Area 2
+85.6% more likely voters than 26P turnout · D+14.0 → D+13.6
Oakley Union Elementary School District Trustee Area 3
+82.4% more likely voters than 26P turnout · D+7.3 → D+12.2
Knightsen Elementary School District
+75.1% more likely voters than 26P turnout · R+10.4 → R+9.8
Canyon Elementary School District
+48.9% more likely voters than 26P turnout · D+67.4 → D+64.2
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.