Population 2010

685,306

Population 2020

779,233

Registered Voters

293,957

Republicans

107,147

Democrat

128,530

Minor Party

1518,30

No Party

7,553

Municipalities

City Name Population 
Escalon7,106
Lathrop17,488
Lodi62,354
Manteca66,081
Ripon14,021
Stockton289,926
Tracy81,115

Superintendent of Schools

Treasurer / Tax Collector

County Commission

District 1 Miguel Villapudua
District 2 Katherine Miller
District 3 Tom Patti 
District 4 Charles Winn
District 5 Bob Elliott

School Board

District 1 Janet D. Dyk
District 2Ken Vogel
District 3 Douglas I. Vigil
District 4 Vernon J. Gebhardt
District 5 Greg Clark

Brief Political History

In the California State Senate, San Joaquin County is in the 5th Senate District, represented by Democrat Susan Eggman.[46]

On November 4, 2008, San Joaquin County voted 65.5% in favor of Proposition 8 which amended the California Constitution to ban same-sex marriages.[47]

For most of its history, San Joaquin County has been a Republican-leaning swing county, voting for the national winner in all but 4 presidential elections (1884, 1948, 1960, 1976) from 1880 to 2012. In 2016, Hillary Clinton became the first Democratic Party candidate who lost nationally to win the county, and she did so by a sizable margin of around 14 points. Conversely, Donald Trump posted the worst result in county history for a national Republican Party electoral college winner, being held to under 40% of the vote. In 2020, Trump vastly increased upon his 2016 results, securing more votes than any Republican candidate in history. Despite this, he only barely passed 40% due to a similarly large increase on the Democratic side.

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