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.
Please reply below if you have any additional questions.
When you are in TurboTax working on your Wisconsin tax return:
The program will ask for a county, select your county.
The next screen will ask for your School Code and Tax District Information. This question has a link that will take you to the school districts under that county.
See the following images for your reference:
You can also visit the Department of Revenue at the link below: