How to Pull Tax Delinquent County Data for Milwaukee County, WI

A tax delinquent list shows properties where the owner is behind on property taxes. To find tax delinquent records for Milwaukee County, Wisconsin (WI), use City of Milwaukee Open Data. No account is needed. It is free to use. You need a US VPN. You may see a CAPTCHA. You can download a CSV file.

Also known as: delinquent tax list, delinquent property taxes, back taxes list.

Verified November 5, 2026 5 steps City of Milwaukee Open Data
See the steps Open the site

What you need

Account
No account needed
Cost
Free
CAPTCHA
CAPTCHA sometimes
Export
CSV download
VPN
US VPN needed

This site is not open from every country. In our test it showed error code 1009 from the Philippines and opened from the US.

What it is

The City of Milwaukee Treasurer's list of real estate tax accounts that are not paid. It covers properties in the City of Milwaukee.

Why it matters

Unpaid taxes can lead to foreclosure. The owner may want to sell before that happens. The owner name and mailing address are already in the file.

The fields you get

  • Levy year
  • Tax key
  • Property address
  • Alderman district
  • Owner name
  • Owner mailing address
  • Owner city, state and ZIP
  • Total tax principal

The dataset says it updates monthly. The file we saw was marked current balance as of October 5, 2026.

Follow these 5 steps

  1. Check that the site opens

    Open data.milwaukee.gov. The site is not open from every country. If you see error code 1009, it is not available at your location. In our test it opened from the US and not from the Philippines.
    Screenshot of City of Milwaukee Open Data, step 1: Check that the site opens Enlarge

  2. Download the file

    Click this link: Delinquent Real Estate Tax Accounts CSV. The file downloads right away. It has about 17,500 rows.
    Tip: This is the same data as the dataset page. That page may show Checking your browser first, and may ask you to solve a CAPTCHA.

  3. Open the file

    Open the CSV in Excel or Google Sheets. Each row is one unpaid tax year for one property. The same property can have more than one row. Sample rows from the downloaded file, owner columns left out. This image is not a site screenshot.
    Screenshot of City of Milwaukee Open Data, step 3: Open the file Enlarge

  4. Find the oldest debts

    Sort Levy Year from oldest to newest. Older unpaid years are closer to tax foreclosure.

  5. Save your records

    Keep Tax Key #, Property Address, Levy Year, Total Tax Principal and Owner's Name. Save the sheet. Add City of Milwaukee and WI to each property address.

Tips for after you pull

  • Owners with a mailing address out of town may be absentee owners. Compare the mailing address with the property address.

Watch out for these

  • The City, State and Zip columns belong to the owner's mailing address, not the property. A row can say CHASKA, MN and still be a Milwaukee property.
  • Do not use those columns to sort by county. Every property in the file is in the City of Milwaukee.
  • Total Tax Principal does not include interest. The dataset page says the full payoff also includes accrued interest.

Common questions

Why do I see other cities in this file?
Those are owner mailing cities. The property is still in the City of Milwaukee.

Other lists in Milwaukee County

Code ViolationMilwaukee County, WI

Tax Delinquent in other states

District of Columbia, DC

See every guide

All Wisconsin guides 2 All Tax Delinquent guides 2

Do not want to do this by hand?

CountyPull pulls this list for you automatically.

Start free 100 free rows each month