Public ArcGIS MapServer endpoint for Los Angeles County parcel data. URL, supported fields, and a working sample query, copy it, or open it directly in the UrbanKit parcel lookup tool.
https://public.gis.lacounty.gov/public/rest/services/LACounty_Cache/LACounty_Parcel/MapServer/0AINAssessor Identification Number (AIN)APNAssessor Parcel Number (formatted)SitusFullAddressSitus Addresscurl -s 'https://public.gis.lacounty.gov/public/rest/services/LACounty_Cache/LACounty_Parcel/MapServer/0/query?where=AIN%3D%274321002009%27&outFields=*&f=json'
https://public.gis.lacounty.gov/public/rest/services/LACounty_Cache/LACounty_Parcel/MapServer/0/query?where=AIN='4321002009'&outFields=*&f=jsonOpen this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| AIN | Assessor Identification Number (AIN) | YES |
| APN | Assessor Parcel Number (formatted) | YES |
| SitusFullAddress | Situs Address | YES |
| SitusCity | City | NO |
| SitusZIP | ZIP Code | NO |
| UseCode | Use Code | NO |
| UseDescription | Use Description | NO |
| YearBuilt1 | Year Built | NO |
Los Angeles County is the most populous US county (pop. 10M+) and contains 88 incorporated cities plus a large unincorporated area. The Assessor Identification Number (AIN) is a 10-digit numeric code unique to each parcel. The public LACounty_Cache/LACounty_Parcel MapServer layer exposes AIN, APN, and SitusFullAddress (no owner name), per California Government Code §7928.205, which broadly restricts owner name and mailing address from public REST endpoints across California. For ownership data, use the LA County Assessor's portal at assessor.lacounty.gov; the Assessor's office manages roughly 2.5 million parcels and publishes annual assessment rolls. Re-verified live 2026-06-04, a sample AIN query returned a real parcel. The EGIS open-data hub at egis-lacounty.hub.arcgis.com has downloadable parcel shapefiles. AIN queries use exact match: AIN='4321002009' (no dashes).
Los Angeles County GIS, https://egis-lacounty.hub.arcgis.com/
Los Angeles County's LA County Parcel layer exposes parcel identifiers (Assessor Identification Number (AIN), Assessor Parcel Number (formatted)) and address fields (Situs Address). Use it for address-to-PIN lookups and identifier queries. 3 of 8 listed fields accept queries; the rest are returned on read but not indexed for search. Served as an ArcGIS MapServer layer, which supports query operations but not write operations; last verified 2026-06-04.
/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 Los Angeles County actually publishes, not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
public.gis.lacounty.gov serves Los Angeles County, California 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 Los Angeles County's MapServer layer on 2026-06-04. 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.
Los Angeles County's layer is hosted by the county on public.gis.lacounty.gov. Public ArcGIS endpoints rarely rate-limit individual reads, but public.gis.lacounty.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.