Public ArcGIS MapServer endpoint for Will County parcel data. URL, supported fields, and a working sample query, copy it, or open it directly in the UrbanKit parcel lookup tool.
https://gis.willcountyillinois.com/server/rest/services/Basemap/Parcels_20/MapServer/0PINParcel Identification Numbercurl -s 'https://gis.willcountyillinois.com/server/rest/services/Basemap/Parcels_20/MapServer/0/query?where=PIN%3D'1909142050020000'&outFields=*&f=json'
https://gis.willcountyillinois.com/server/rest/services/Basemap/Parcels_20/MapServer/0/query?where=PIN='1909142050020000'&outFields=*&f=jsonOpen this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| PIN | Parcel Identification Number | YES |
NOTE 2026-06-27: Parcels_21/MapServer became a zombie service (service listed but layers:[]. All layer queries return HTTP 500 'json' error). Parcels_20/MapServer/0 is the active fallback (prior-year snapshot, 276,644 parcels confirmed live). No Parcels_22 or newer service exists on the server as of 2026-06-27. URL updated from Parcels_21 to Parcels_20. Owner-name and address fields are NOT exposed in this public endpoint, only PIN and subtype metadata (Base Parcel, Condo, Leasehold, Mineral Rights, etc.). Owner/address data exists in the county's Geocortex viewer at gisapp.willcountyillinois.com but is not queryable via REST without a token. The ParcelFabric folder on the same server is token-gated. FIPS 17197 (Joliet / Chicago south suburbs). Contact GIS Division at gis@willcounty.gov for endpoint status updates.
Will County GIS Division, https://willcounty.gov/County-Offices/Administration/GIS-Division
Will County's Parcels_20 layer exposes a parcel identifier (Parcel Identification Number). Use it for PIN-keyed record pulls (owner-name search lives on a separate assessor system). The single listed field accepts queries. Served as an ArcGIS MapServer layer, which supports query operations but not write operations; last verified 2026-06-27.
/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.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 Will County actually publishes, not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
gis.willcountyillinois.com serves Will County, Illinois parcels over public ArcGIS REST, but, like most county servers, it may not send the CORS headers a browser needs for a cross-origin fetch. If a direct browser call fails, the layer still works from curl, Postman, or a server-side script; the UrbanKit parcel lookup tool proxies the request, so a search that succeeds there confirms the layer is genuinely public.
We last verified Will County's MapServer layer on 2026-06-27. County GIS teams move services without notice, so if you hit a fresh 404, tell us and we'll re-check. Atlas entries are re-verified on a rolling basis.
Will County's layer is hosted by the county on gis.willcountyillinois.com. Public ArcGIS endpoints rarely rate-limit individual reads, but gis.willcountyillinois.com can throttle heavy automated traffic at the host level. Page through results with resultOffset / resultRecordCount and request only the fields you need. There's no API key and no charge from the county.