If your business office is located in an incorporated city limit of Contra Costa County and you will be doing business in the unincorporated area of the County, click HERE
for online application.
If your business office is located in an unincorporated area of the Contra Costa County, you will first need to contact the Division of Community Development
at (925) 674-7200 or visit them at 30 Muir Road, Martinez, CA 94553
, for zoning and planning requirements before applying for a county business license.