See page 60 of the Form 1 instructions for an alphabetical listing of Wisconsin school districts. https://www.revenue.wi.gov/TaxForms2017through2019/2019-Form1-Inst.pdf
Refer to this listing and find the number of the district in which you lived on December 31, 2019. Fill in this number in the name and address area of your return. Failure to include your school district number may delay the processing of your return and any refund due.
The listing is divided into two sections. SECTION I lists all districts which operate high schools. SECTION II lists those districts which operate schools having only elementary grades.
Your school district will generally be the name of the municipality where the public high school is located which any children at your home would be entitled to attend. However, if such high school is a “union high school,” refer to SECTION II and find the number of your elementary district.
The listing has the names of the school districts only to help you find your district number. Don’t write in the name of your school district or the name of any specific school. Fill in only your school district’s number on the school district line in the name and address area of your return.
1. If you lived in the city of Milwaukee, you will enter the number 3619 on the school district line.
2. If you lived in the city of Hartford, you would refer to SECTION II and find the number 2443, which is the number for Jt. No. 1 Hartford elementary district.
The following are other factors to be considered in determining your school district number:
1. If you lived in one school district but worked in another, fill in the district number where you lived.
2. If you were temporarily living away from your permanent home, fill in the district number of your permanent home