City taxes in box 14 of W2

On my W2 in box 14 I have DNVR which in looking at year end paystub it shows under "employee taxes" section as "City Tax - DNVR". Since I know box 14 is just informational, where would I input these city taxes I must have paid sometime during the year? I see box 19 and 20 on W2 is for local taxes but they are empty so I don't think I should put it in those boxes in turbotax. Any direction would be helpful! TIA