You must be looking at the School District (SD) section of the "Finder". Westerville has a 2.0% City income Tax.
You do not need a code for box 20 City tax (you do for SD tax).
You say you work there, but don't say where you live. If you also live in Westerville, you need to file a city return. The City of Westerville has mandatory filing. You can not do a Westerville return with TurboTax, since it is neither a CCA or RITA member. City tax web site: https://www.westerville.org/services/income-tax-forms
You normally only have to
file a return in the city you live in. It is not necessary to file one in the
city you work in, if different. Your employer will remit withholding to the
city you work in, but you do not file a return unless you're claiming a refund or
your employer didn't withhold enough ( both highly unusual). The city you live
in will allow a credit or partial credit for the withheld tax you paid to the
work location city.
To verify or find out if
you live in a school district or city with an income tax enter your address at:
http://www.tax.ohio.gov/Individual/LocalTaxInformation.aspx
