THE SAN JOAQUIN COUNTY LAND BRIEF
Land in the
Delta setting.
San Joaquin County has 1,392.3 square miles of land in California. 10 mapped landscape regions meet across San Joaquin County: Delta, Northern Terraces, Lodi Alluvium, among others.
The Sacramento and San Joaquin river systems occupy broad sediment-filled basins, with fans and terraces toward the valley margins. These nearly level landscapes contrast with California's surrounding hills and mountains.
Regional context: Central California Valley ↗ · Regional mapping across the county footprint
Where the landscape changes
San Joaquin County intersects 10 mapped regional units. The largest mapped shares are:
- Delta21.7%
- Northern Terraces17.7%
- Lodi Alluvium12%
- Stockton Basin10.9%
- Westside Alluvial Fans and Terraces10.3%
Central California Foothills and Coastal Mountains in San Joaquin County
Oak woodland, chaparral and grassland occupy foothills and low coastal mountains around the Central Valley. Narrow agricultural valleys interrupt this landscape of dry summers and wetter winters.
Read the regional source ↗Finding your parcel within San Joaquin County
The atlas lists 28 cities, towns, townships, and Census communities associated with San Joaquin County, including Stockton, Tracy, Manteca. The list includes overlapping geography types and does not divide the county into exclusive service areas.
San Joaquin County by land and water
The Census records 34.3 square miles of water within San Joaquin County, or 2.4% of its total area. That share is close to San Joaquin County’s 2.4%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, San Joaquin County has 1,148.8 times the land area of nearby Kennedy CDP (1.21 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Alameda County, Amador County, Calaveras County, Contra Costa County, Sacramento County, Stanislaus County within California. A tract near one of these lines should be matched to the county identifier on its own records.

