Brown County has a number of different communities and school districts, with Green Bay being one of them. Green Bay is located in the Green Bay Area Public School District, the school district number for Green Bay is 2289.
For additional information, here is a link to a guide on the Wisconsin Department of Revenue website. The school district codes can be found on page 57 for reference https://www.revenue.wi.gov/DORForms/2015Form1_inst.pdf.
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