How do I find my total state and local sales tax rate?

https://ttlc.intuit.com/questions/1900791-how-do-i-find-my-local-sales-tax

https://ttlc.intuit.com/questions/2566624-how-much-sales-tax-did-i-pay-last-year

The IRS has a handy online sales tax calculator, which uses your zip code:  https://www.irs.gov/credits-deductions/individuals/sales-tax-deduction-calculator