what is massachusetts state id number

state id number for massachusetts?
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    According to 1099-G instructions at IRS.gov website this is an "optional field".  My MA 1099-G doesn't even have any boxes beyond Box #8 (go figure), so I'm leaving it blank.

    Box 10b. State identification no. (optional)
    Enter the identification number of the state department, division, or office identified in box 10a.
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      The 1099-G form has a box "Payer's Federal Identification Number". This is the State ID Number TurboTax asks for.
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