Public ArcGIS MapServer endpoint for Lake County parcel data. URL, supported fields, and a working sample query — copy it, or open it directly in the UrbanKit parcel lookup tool.
https://maps.lakecountyil.gov/arcgis/rest/services/GISMapping/WABParcels/MapServer/12PINParcel Identification Numbertaxpayer_nameTaxpayer Namesitus_addr_line_1Situs Addresssitus_addr_citySitus Citycurl -s 'https://maps.lakecountyil.gov/arcgis/rest/services/GISMapping/WABParcels/MapServer/12/query?where=UPPER(taxpayer_name)%20LIKE%20UPPER('%25SMITH%25')&outFields=PIN,taxpayer_name,situs_addr_line_1,situs_addr_city&f=json&resultRecordCount=10'https://maps.lakecountyil.gov/arcgis/rest/services/GISMapping/WABParcels/MapServer/12/query?where=UPPER(taxpayer_name) LIKE UPPER('%SMITH%')&outFields=PIN,taxpayer_name,situs_addr_line_1,situs_addr_city&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| PIN | Parcel Identification Number | YES |
| taxpayer_name | Taxpayer Name | YES |
| situs_addr_line_1 | Situs Address | YES |
| situs_addr_city | Situs City | YES |
Lake County is the northernmost Illinois collar county, bordering Wisconsin (county seat Waukegan, pop. 710,000). WABParcels/MapServer is a 13-layer service; layer 12 (Tax Parcel Information) is the rich parcel polygon layer with 190+ fields covering PIN, taxpayer_name, situs address, assessment values, building characteristics, flood zone, and political boundaries. Owner-name search works via UPPER() LIKE on the taxpayer_name field. The county also exposes CCAO/TaxParcelViewer/MapServer but its layer 14 has only a Name field — WABParcels/12 is the correct layer for rich queries. Key fields beyond PIN and taxpayer_name include situs_addr_line_1, situs_addr_city, situs_zip, mail_addr_line_1, mail_city, mail_zip, property_class, tax_rate, tot_assessed_val, year_built, liv_area_sqft, zoning_district, flood_zone, and multiple political-boundary fields (congressional_district, state_rep_district, school_district, fire_district). The endpoint is at maps.lakecountyil.gov — not to be confused with Lake County Indiana or Lake County Ohio, which use separate GIS systems.
Lake County, Illinois GIS Division — https://www.lakecountyil.gov/636/GISMaps
Lake County's Tax Parcel Information layer exposes a parcel identifier (Parcel Identification Number), owner names (Taxpayer Name), and address fields (Situs Address, Situs City). Use it for owner-name lookups and address-based parcel searches. All 4 listed fields accept queries. Served as an ArcGIS MapServer layer, which supports query operations but not write operations; last verified 2026-05-15.
/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 Lake County actually publishes — not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
Many county servers allow public reads but block browser cross-origin requests. The UrbanKit parcel lookup tool fetches directly from your browser; if it works there, the layer is technically public. For your own integration, you may need a same-origin proxy or server-side fetch.
Possibly — counties move services without warning. We re-verify entries weekly and flag stale ones. If you're seeing a fresh 404, please let us know and we'll update the listing.
Most are. Public ArcGIS layers don't typically rate-limit individual reads, but heavy programmatic use can trigger throttling at the host level. Be respectful — query what you need.