There isn't one.
It varies not just from State to State, but frequently from county to county and even city or town to city or town within a state.
Also. what is taxed changes from area to area.
There is no universal sales tax rate in America - each state, county and city applies their own sales tax. See 'Sources and related links' below for each rate.
The sales tax rate on used goods in this state is X.
The sales tax rate on used items in this state is X.
The sales tax rate for Topeka, KS is 8.95% and that is including the state of Kansas sales tax.
The state sales tax rate in Massachusetts is 6.25%
The state sales tax rate in Louisiana is 5.000%. With local taxes, the total sales tax rate is between 5.000% and 12.000%.
The state sales tax rate in Maryland is 6%. There are no local taxes beyond the state rate.
The state sales tax rate in Colorado is 2.900%. With local taxes, the total sales tax rate is between 2.900% and 10.900%.
The current total local sales tax rate in Tulsa, OK is 8.517%.
The state sales tax rate in Arizona is 5.600%. With local taxes, the total sales tax rate is between 5.850% and 10.900%.
The sales tax rate in Iowa is 6%. Some areas of the state impose an additional 1% Local Option Sales Tax (LOST) bringing the total sales tax rate to 7%.
The sales tax rate are not the same in every state. It varies on what the state and local governments charge. If a business has a sales tax license, then they are allowed to charge it.