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Politics in theSan Francisco Bay Area is widely regarded as one of the mostliberal in the country. According to theCalifornia Secretary of State, theDemocratic Party holds a voter registration advantage in everycongressional district,State Senate district,State Assembly district,State Board of Equalization district,County Board of Supervisors district, all nine counties, and all of the 101 incorporated municipalities in the Bay Area. TheRepublican Party holds a voter registration advantage in one congressional sub-district (the portion of the9th inContra Costa County) and unincorporatedSolano County.[1]
Since 1960, the nine-county Bay Area has voted forRepublican presidential candidates only twice: in 1972 forRichard Nixon and in 1980 forRonald Reagan, both Californians. The last county to vote for a Republican presidential candidate wasNapa County in 1988 forGeorge H. W. Bush.
All nine counties in the Bay Area currently have a voter registration advantage in favor of the Democratic Party.
| County | |||||||
|---|---|---|---|---|---|---|---|
| Population (2020)[2] | 2024 election results[3] | Median household income (2018)[4] | Per capita income (2011)[5] | Voter Registration (2023)[6] | |||
| Democratic | Independent | Republican | |||||
| Alameda | 1,682,296 | 74.6%—21.0% Harris | $92,574 | $33,888 | 563,864 | 222,019 | 102,953 |
| Contra Costa | 1,165,983 | 67.3%-29.4% Harris | $93,712 | $36,274 | 379,524 | 153,822 | 127,752 |
| Marin | 262,325 | 80.6%-16.7% Harris | $110,217 | $49,439 | 106,921 | 33,102 | 20,721 |
| Napa | 138,014 | 65.9%-31.1% Harris | $84,753 | $32,170 | 42,491 | 16,988 | 17,731 |
| San Francisco | 878,392 | 80.3%-15.5% Harris | $104,552 | $44,905 | 318,286 | 122,624 | 34,890 |
| San Mateo | 764,659 | 73.5%-23.2% Harris | $113,776 | $44,331 | 244,946 | 104,646 | 60,259 |
| Santa Clara | 1,936,278 | 68.0%-28.1% Harris | $116,178 | $39,365 | 525,176 | 280,493 | 167,840 |
| Solano | 453,551 | 60.0%-37.0% Harris | $77,609 | $27,785 | 129,593 | 57,895 | 58,542 |
| Sonoma | 488,862 | 71.4%-25.2% Harris | $76,753 | $30,868 | 171,744 | 53,578 | 52,658 |
| Median | — | — | $96,265 | $37,851 | — | — | — |
| Total | 7,770,360 | 70.1%–24.2% Harris | — | — | 2,482,545 | 1,342,167 | 643,346 |
| County | Population[7] | Registered voters[8] | Democratic[8] | Republican[8] | D–R spread[8] | American Independent[8] | Green[8] | Libertarian[8] | Peace and Freedom[8] | Americans Elect[8] | Other[8] | No party preference[8] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alameda | 1,494,876 | 54.6% | 56.4% | 14.1% | +42.3% | 2.0% | 1.2% | 0.5% | 0.4% | 0.0% | 6.0% | 19.5% |
| Contra Costa | 1,037,817 | 58.5% | 50.4% | 21.8% | +24.8% | 2.6% | 0.5% | 0.6% | 0.2% | 0.0% | 0.2% | 23.7% |
| Marin | 250,666 | 61.5% | 54.4% | 18.2% | +36.2% | 2.1% | 1.4% | 0.5% | 0.2% | 0.0% | 0.3% | 12.9% |
| Napa | 135,377 | 56.2% | 46.9% | 24.2% | +22.7% | 3.0% | 0.8% | 0.8% | 0.3% | 0.0% | 0.5% | 23.4% |
| San Francisco | 870,887 | 62.4% | 55.6% | 8.6% | +47.0% | 1.8% | 1.7% | 0.6% | 0.3% | 0.0% | 0.3% | 31.1% |
| San Mateo | 711,622 | 50.7% | 51.3% | 19.4% | +31.9% | 2.1% | 0.7% | 0.5% | 0.2% | 0.0% | 0.2% | 25.5% |
| Santa Clara | 1,762,754 | 46.5% | 45.6% | 21.7% | +23.9% | 2.1% | 0.5% | 0.6% | 0.2% | 0.0% | 0.2% | 29.0% |
| Solano | 411,620 | 51.1% | 48.6% | 25.0% | +23.6% | 2.8% | 0.4% | 0.5% | 0.4% | 0.0% | 0.4% | 22.0% |
| Sonoma | 478,551 | 54.7% | 51.5% | 21.6% | +29.9% | 2.5% | 1.8% | 0.7% | 0.3% | 0.0% | 0.3% | 21.3% |
Every Congressional district in the Bay Area is currently represented by a Democrat. According to theCook Partisan Voting Index (CPVI),congressional districts the Bay Area tends to favor Democratic candidates by roughly 40 to 50 percentage points, considerably above the mean for California and the nation overall. All congressional districts in the region voted for DemocratKamala Harris over RepublicanDonald Trump in the2024 Presidential Election.
| District | Location | Representative | Cook PVI[9] | 2024 election results[10] | Median household income (2025)[11] |
|---|---|---|---|---|---|
| 2nd | Marin County and theNorth Coast | Jared Huffman | D+24 | 70.9%–25.7% Harris | $97,004 |
| 4th | Lake andNapa, most ofYolo, and parts ofSolano andSonoma | Mike Thompson | D+17 | 64.0%–32.8% Harris | $98,067 |
| 8th | Parts ofSolano andContra Costa around theSacramento-San Joaquin River Delta | John Garamendi | D+24 | 70.1%-26.6% Harris | $95,876 |
| 10th | Most ofContra Costa:Concord, Southern Antioch,Walnut Creek and parts ofAlameda, California | Mark DeSaulnier | D+18 | 65.2%-31.4% Harris | $151,546 |
| 11th | San Francisco | Nancy Pelosi | D+36 | 81.4%–14.1% Harris | $142,524 |
| 12th | Berkeley,Oakland, andSan Leandro | Lateefah Simon | D+39 | 84.5% 10.6% Harris | $111,408 |
| 14th | Hayward,Union City, and theTri-Valley | Eric Swalwell | D+20 | 65.8%-30.3% Harris | $137,402 |
| 15th | Most ofSan Mateo County and southern San Francisco | Kevin Mullin | D+27 | 72.2%-24.3% Harris | $151,494 |
| 16th | FromPacifica to the southern edge of San Jose throughMenlo Park and western Silicon Valley | Sam Liccardo | D+26 | 72.5%-23.9% Harris | $181,659 |
| 17th | South ofFremont and northernSilicon Valley | Ro Khanna | D+25 | 66.7%-28.8% Harris | $181,913 |
| 18th | San Jose andMorgan Hill | Zoe Lofgren | D+23 | 63.2%-33.7% Harris | $103,010 |
| Median | — | — | D+19 | 72%–25% Harris | $69,316 |
During theBase Realignment and Closures (BRACs) of the 1990s, almost all the military installations in the region were closed.[12][13] The only remaining majoractive duty military installations areTravis Air Force Base[14] andCoast Guard Island.
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