what is the current sales tax in contra costa county
2017 Contra Costa County, California Sales Tax The Contra Costa County, California sales tax is 8.50% , consisting of 6.50% California state sales tax and 2.00% Contra Costa County local sales taxes.The local sales tax consists of a 1.00% county sales tax and a 1.00% special district sales tax (used to fund transportation districts, local attractions, etc).