Winnebago County, IL
parcel GIS REST API.

No public parcel REST endpoint we can serve for Winnebago County.

No public REST endpoint we can serve

WinGIS, a subscription GIS service, runs Winnebago County's parcel layers, and every query needs a login token, so we don't index it. Search the WinGIS property search, or request it and we'll tell you if that changes.

Checked 2026-05-15. Request it below and we’ll tell you if that changes.

How to find an ArcGIS parcel layer URL

Notes

Winnebago County IL GIS is operated by WinGIS (wingis.org), a regional GIS services company on a subscription model. Their ArcGIS REST server at maps.wingis.org/public/rest/services/PropertySearch/MapServer is indexed as containing Parcel & Lot Lines, Parcel Owner, PIN Labels, and Parcel Dimensions layers, but all REST queries return HTTP 499 (Token Required) as of 2026-05-15. The word 'public' in the URL path is a directory naming convention, not an access grant. The public-facing search at wingis.org/maps/propertysearch is browser-only and not queryable. No alternative county-hosted ArcGIS REST endpoint was found. The Supervisor of Assessments at assessor.wincoil.gov has a property lookup UI but no public REST API.

Source

WinGIS (Winnebago County GIS partner), https://wingis.org/

Using this endpoint

What Winnebago County publishes

Winnebago County does not yet have a verified public REST endpoint in our atlas. The sections below cover patterns common to most county parcel APIs.

Two paths from URL to result

Open in Parcel Lookup: click the button on the endpoint card. The lookup tool loads the layer, auto-detects fields, and gives you a search box. No code, no API keys, just a browser.
Query directly: append /query?where=…&outFields=*&f=jsonto the URL. The sample query above is a working example you can paste into a browser tab to see the raw JSON response.

Why field names vary by county

Counties publish parcel data through their own ArcGIS Server installations, each with its own schema. One county uses APN, another uses PIN, a third uses PARCEL_ID. Some expose owner names; others keep them on a separate assessor's portal. The searchable fields list above reflects what Winnebago County actually publishes, not what you might expect from a national standard (there isn't one).

For background, see What is an APN?

What to do with the results

Generate a public-notice mailing list: pipe the parcel layer URL into Radius Notice to buffer around an address and select neighboring owners.
Print Avery 5160 labels: export the result CSV and drop it into CSV → Labels.
Pull individual parcel records: use Parcel Lookup directly to grab zoning, assessed value, and ownership for one property at a time.

Quick FAQs

Does Winnebago County have a public parcel REST endpoint?

Not in our atlas yet. Winnebago County either runs a token-gated server or a viewer-only portal. If you know a public ArcGIS REST URL for it, add it to the request form above and we'll check it.

View all FAQs

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