The website for the Sales Tax Clearinghouse provides a calculator so a user can find sales tax by inputting a ZIP code and hitting Look Up. The calculator displays any state, county and city sales taxes for that area.
Almost all states impose sales taxes to help fund their governmental responsibilities, according to HowStuffWorks. Sales taxes are important parts of state budgets, used to help pay for services such as schools, courts, highway departments and state police. Along with property taxes, counties also use sales tax revenues to provide public services, King County reports. Some of the funds go to cities and towns within the counties, as well.