TurboTax has no way determine the jurisdiction in which you reside from your address.
It seems unlikely that could have resulted from leaving the jurisdiction blank. If left blank, TurboTax prohibits e-filing and defaults to using a rate of 0.0320 (the highest rate of any jurisdiction). The only reason that TurboTax would use a rate of 0.0283 would be if a jurisdiction having a 0.0283 rate was selected. Baltimore County is the only jurisdiction with a 0.0283 rate.
