Background

GIS Data for San Joaquin County

The San Joaquin County GIS Map Server website offers a comprehensive collection of downloadable digital GIS data provided as ESRI shapefiles in Zip archives, updated biannually (most recently on January 6, 2025). Visitors can access a wide range of technical datasets categorized into key areas including **Administrative** (e.g., County Limit, City Limits, School Districts), **Cadastral** (Parcels, APN Book Index), **Transportation** (Streets, Railroads, Highway Exits), **Addressing** (Address Grid regions and sections), **Political** districts, **Hydrology** (Lakes & Rivers, Ponds, Delta zones), **Planning** (Zoning, General Plan, Agricultural Preserves, Airport Influence Areas), **Locations** (Airports, Hospitals, Parks), **Safety** (Fire Districts, Sheriff Beats, Ambulance Zones), **Services** (Water, Sewer, Irrigation Districts), **Hazards** (Fire Hazard Severity Zones, Earthquake Zones, Flood Zones), **Topography** (Elevation Contours), and **US Census 2020** spatial units. The site also provides standard reference data such as PLSS Sections and USGS 7.5' Quads. All datasets are projected to CCS83 NAD83 Zone 3 in US Survey Feet and require specialized GIS software and skills for effective use. For users needing more current or customized data extracts, a dedicated [GIS Data Request](https://sjmap.org/GISDataRequest.htm) page is available. Note that use of this data is subject to specific terms, disclaimers, and no technical support is provided outside normal County operations.