Box 18 shows all the taxable wages, reported tips, and other compensation you earned during the year subject to local taxes.
Not all states have local taxes, so it's common for this to be blank on your W-2. If it is, you don't have to enter anything for boxes 18 through 20. If this is the case, leave those fields blank.
Is there an amount on Line 19? If so, make sure you have the state code entered on that line and a description of the locality in Box 20. Pay attention to any warnings TurboTax shows after entering or editing your w-2.
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