Web GIS

Interactive Maps
The GIS team has developed an interactive map application for use on our web site.  The goal of serving maps via a web browser is to provide you with easier access to County data.  Please turn off your popup blocker when using our interactive map applications.

Assessor Search


An assessor search by Assessor Parcel Number (APN) or Adress can be accessed here.



Data Download


The County provides free access to most of our GIS data via the internet.  Note that GIS or CAD software on your computer is required to use these files.  Click here to download.    


Bay Area Map


The Contra Costa, Bay Area Map will help you find Contra Costa's location in the San Francisco Bay Area.


District and Supervisor Map


 
The District & Supervisor Map identify your District Supervisor and determine if you live in unicorportated or incorporated Contra Costa