The State and Local income taxes can include any balance due you paid to the State/local people when you filed 2018 taxes in 2019.....plus a few other things too.
save a PDF copy of your tax return, for your records, with all forms and worksheets and look for the Federal "Tax Payments Worksheet. That worksheet shows all your Stat e(local) income tax payments made .
Lines 20, 21, 22, 23 of that worksheet shows all the possible state and local sources of payments being xferred to line 5a of the Schedule A (minus any 4th Qtr state/local Estimated payment you might have made in Jan of 2020)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
