How do you find a state id number if there is not one on the w2g form? the w2g is from Nevada

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Try leaving it blank unless state income tax was withheld. The W2G instructions state:

State Tax Information
Boxes 13, 14, and 15 and Copies 1 and 2 are provided for your convenience only and don't have to be completed for the IRS. If you withheld state income tax on a payment of gambling winnings, you may enter it in box 15 of Form W-2G. If you do, also complete boxes 13 and 14. A state identification number (box 13) is assigned by each individual state.