San Joaquin County comprises the Stockton-Lodi, CA Metropolitan Statistical Area, which is also included in the San Jose–San Francisco–Oakland, CA Combined Statistical Area. The county is located in the Central Valley, just east of the nine-county San Francisco Bay Area region.
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 (meaningJoachim) to the San Joaquin River, which springs from the southern Sierra Nevada. San Joaquin County is the site of theSan Joaquin Valley‘s first permanent residence.
Between 1843 and 1846, during the era when California was a province of independent Mexico, five Mexican land grants were made in what became San Joaquin County: Campo de los Franceses, Pescadero (Grimes), Pescadero (Pico), Sanjon de los Moquelumnes and Thompson.
It was developed for ranching and agriculture. It attracted more miners and settlers at the time of the California Gold Rush.