Every Wisconsin county is governed by an elected county board, and every seat on it is a supervisory district — 1,590 of them across all 72 counties, on boards as small as five seats and as large as 38. The tool finds the district that covers any point in the state and names the supervisor who holds it, with the phone number and email the county publishes for them.
Find your county supervisor →Opens the map with the county and county board layers on. Search your address or ZIP, or tap your location.
What the lookup shows
Select any point in Wisconsin and the county board card shows the county, the supervisory district number, and the supervisor who holds it — with their phone number and email where the county publishes those, their role on the board where they hold one, a link to their own page where the county keeps one, and a link to the county's board directory. It also says how many seats the board has.
Three things a seat can be besides filled, and the card says which. A seat the county itself marks empty is shown as vacant — leaving the row off would read as "we could not find out", which is a different thing. A district that two publishers draw differently, so that which supervisor represents part of its ground is not settled, is shown as not named, with the reason. And where a county names its board only in a document rather than on a page, the card links the document, because that is the one place the name can be checked.
Where the names come from
Wisconsin publishes no statewide roster of county supervisors, so all 72 counties were assembled one at a time, each from the county's own board page, clerk's directory, staff directory or, in a few cases, its own GIS layer. Most are re-read weekly and any change arrives as a reviewed update, never an automatic one. A handful are read once and carried with the date they were read, because those counties' websites either ask automated readers to stay off or answer with a challenge this project does not try to defeat; the sources & data layers page names which.
Some counties publish less than others, and the card shows exactly what each one does. A county that prints one phone number for its whole board — the clerk's line — does not get that number attached to each supervisor as if it were a direct line. A county that publishes addresses only behind a script that hides them from harvesters keeps them hidden here too. Nothing is filled in from memory or inferred from a name.
Supervisory district, ward, aldermanic district
Three maps that are easy to confuse, and none of them share their lines.
- Supervisory district — one seat on the county board. Redrawn by each county after the decennial census, from whole municipal wards.
- Municipal ward — the unit Wisconsin administers elections by. Every supervisory district, assembly district and senate district is built from whole wards, which is why they nest cleanly and why the ward is the smallest thing on the map. Turn on the Municipal Ward layer to see yours.
- Aldermanic district — a seat on a city council (or, in nine villages, a trustee district). A city government, not the county. The map has a layer for those too: see your aldermanic district.
The same address always has one county supervisor, and in a city it also has an alderperson; the two answer to different boards about different things.
Where the boundaries come from
District boundaries come from the Wisconsin Legislative Technology Services Bureau's statewide County Supervisory Districts (Current) layer — the aggregate of every county's twice-yearly filing under Wis. Stat. 5.15(4)(br)1 — pre-built and shipped with the app so the lookup works offline and never waits on the state's server. One county is the exception: Trempealeau's districts come from the county's own adopted 2021–2031 plan, because the state's file merges two of its districts into one and so drops a seat the county still elects. The map is free, requires no login, and sets no tracking cookies.