Public ArcGIS MapServer endpoint for Orange County parcel data. URL, supported fields, and a working sample query, copy it, or open it directly in the UrbanKit parcel lookup tool.
https://www.ocgis.com/arcpub/rest/services/Map_Layers/Parcels/MapServer/0ASSESSMENT_NOAssessment Number (APN)SITE_ADDRESSSite Addresscurl -s 'https://www.ocgis.com/arcpub/rest/services/Map_Layers/Parcels/MapServer/0/query?where=ASSESSMENT_NO+LIKE+'%25072-478%25'&outFields=ASSESSMENT_NO,SITE_ADDRESS,YEAR_BUILT&returnGeometry=false&f=json&resultRecordCount=10'
https://www.ocgis.com/arcpub/rest/services/Map_Layers/Parcels/MapServer/0/query?where=ASSESSMENT_NO+LIKE+'%072-478%'&outFields=ASSESSMENT_NO,SITE_ADDRESS,YEAR_BUILT&returnGeometry=false&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| ASSESSMENT_NO | Assessment Number (APN) | YES |
| SITE_ADDRESS | Site Address | YES |
| YEAR_BUILT | Year Built | NO |
| NBR_BEDROOMS | Bedrooms | NO |
Orange County CA (Anaheim/Santa Ana/Irvine), 687,000+ parcels. Only 6 fields on the public REST endpoint: ASSESSMENT_NO, SITE_ADDRESS, YEAR_BUILT, NBR_BEDROOMS, SHAPE, OBJECTID. Owner name is NOT on this public layer. The ASSESSMENT_NO is the APN with hyphens (e.g. '072-478-23'). Full assessor data is available through the ParcelQuest partnership at the county assessor portal (ocassessor.gov). This domain (ocgis.com) is Orange County California Public Works GIS. Note that Orange County Florida's GIS uses ocfl.net.
Orange County Public Works GIS / OC Survey, https://data-ocpw.opendata.arcgis.com/
Orange County's Parcels layer exposes a parcel identifier (Assessment Number (APN)) and address fields (Site Address). Use it for address-to-PIN lookups and identifier queries. 2 of 4 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 2026-05-15.
/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 Orange County actually publishes, not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
www.ocgis.com serves Orange 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 Orange 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.
Orange County's layer is hosted by the county on www.ocgis.com. Public ArcGIS endpoints rarely rate-limit individual reads, but www.ocgis.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.