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?
maps.lakecountyil.gov serves Lake 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 Lake County's MapServer layer on 2026-05-15. 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.
Lake County's layer is hosted by the county on maps.lakecountyil.gov. Public ArcGIS endpoints rarely rate-limit individual reads, but maps.lakecountyil.gov 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.