THE ANTIOCH LAND BRIEF
Land in the
Suisun Terraces and Low Hills setting.
Antioch city has 29.2 square miles of land in Contra Costa County. Its Census reference point is in Suisun Terraces and Low Hills, within Central California Foothills and Coastal Mountains.
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.
Regional context: Central California Foothills and Coastal Mountains ↗ · Classification at the Census reference point
Antioch and Contra Costa County
Antioch is associated with Contra Costa County in the Census boundary data. Start with the parcel’s tax bill to match the property to that jurisdiction, then confirm which government handles its land use.
Antioch by land and water
The Census records 0.77 square miles of water within Antioch, or 2.6% of its total area. It is 8.3 percentage points lower than the 10.8% recorded for Contra Costa County. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Antioch city has 2 times the land area of nearby Brentwood city (14.9 square miles). These areas describe boundaries, not comparable property prices.

