There is an A# on your naturalization certificate. Since it is available, it is generally recommended to fill in the information, although it is not an error to leave it blank either.
In any event, the I-130 petition if filed correctly will unequivocally label you as a U.S. citizen irrespective of the completion of that field on the G325A.
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Yes you do. Your alien number is to be used any time you complete uscis forms that require it.
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