San Joaquin County

San Joaquin County, California
County
San Joaquin County
Images, from top down, left to right: Downtown Stockton waterfront, Lodi Arch, San Joaquin River Bridge at Mossdale Crossing, Lockeford, Stanislaus River at Caswell Memorial State Park
Seal
Location of San Joaquin County in California
California's location in the United States
Country	United States
State	California
Region	San Joaquin Valley
Incorporated	February 18, 1850
County seat
Largest city	Stockton
Government
• County Administrator	Monica Nino
Area
• Total	1,426 sq mi (3,690 km2)
• Land	1,391 sq mi (3,600 km2)
• Water	35 sq mi (90 km2)
Highest elevation	3,629 ft (1,106 m)
Population (April 1, 2010)
• Total	704,379
• Estimate (2016)	733,709
• Density	490/sq mi (190/km2)
Time zone	Pacific Standard Time (UTC-8)
• Summer (DST)	Pacific Daylight Time (UTC-7)
FIPS code	06-077
GNIS feature ID	277303
Website	www.sjgov.org

San Joaquin County /ˈsæn wɑːˈkiːn/ is a county in the U.S. state of California. As of the 2010 census, the population was 685,306. The county seat is .

San Joaquin County comprises the Stockton-Lodi, CA Metropolitan Statistical Area, which is also included in the more inclusive San Jose-San Francisco-Oakland, CA Combined Statistical Area. The county is located in Northern California's Central Valley, just east of the less extensive nine-county San Francisco Bay Area region.

The City of San Joaquin, despite sharing its name with the county, is located in Fresno County.

San Joaquin County was one of the original United States counties of California, created in 1850 at the time of statehood.

The county was named for the San Joaquin River which runs through it. In the early 19th century Lieutenant Gabriel Moraga, commanding an expedition in the lower great California Central Valley, gave the name of San Joaquin (meaning Joachim) to the San Joaquin River, which springs from the southern Sierra Nevada. San Joaquin County is the site of the San Joaquin Valley's first permanent residence.