If you mean your state Sales tax rate, the loink below has a list be state, but there might also be additional sales tax added for the county or city. The sales tax rate is what the stores charge on your purchases. You can look at a store receipt (but some states don't tax food, so be aware of that).
If you mean where do you find the state Income tax that was withheld from your W2, the state tax you paid is in Box 17 and the local tax you paid is in box 19.
The state and local tax rate is not listed on your W2. Turbotax will tell you what your tax rates are after you complete your returns.
For a table of the ranges of states' income taxes, please click on the lower link.
https://taxfoundation.org/state-and-local-sales-tax-rates-2018/
https://www.money-zine.com/financial-planning/tax-shelter/state-income-tax-rates/
