go back to the actual form 1099-DIV...if you aren't already.
The state is not the state you earned them in....it is the state that issued the bonds held.....i.e. which state did the tax-exempt interest come FROM .
1099-DIV forms are usually from Mutual Fund collections of bonds, and usually, the selection is from the end of the list of states, or "More than one state"
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But it is possible that you invested in a mutual fund that contained almost exclusively NY-issued bonds....even so, the Mutual Fund may contain some non-NY bonds and you may need to break out the NY-Only $$ amounts as shown below (example is for NC bonds for an NC resident)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*