modesto  ca is in what county
Modesto, Stanislaus County Sales Tax Rate. Details. The sales tax in Modesto is 7.38%, which is about average for cities in Stanislaus County and lower than average for California (7.75%). Modesto is one of 21 cities in Stanislaus County with a distinct sales tax as listed by the California Board of Equalization. See all cities in Stanislaus County.