Public ArcGIS MapServer endpoint for Harris 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.gis.hctx.net/arcgis/rest/services/HCAD/Parcels/MapServer/0HCAD_NUMHCAD Parcel Numberacct_numAccount Numberowner_name_1Owner Name (Primary)owner_name_2Owner Name 2site_str_numSite Street Numbersite_str_nameSite Street Namesite_citySite Citysite_zipSite ZIPmail_addr_1Mailing Addresscurl -s 'https://www.gis.hctx.net/arcgis/rest/services/HCAD/Parcels/MapServer/0/query?where=UPPER(owner_name_1)%20LIKE%20UPPER('%25SMITH%25')&outFields=HCAD_NUM,owner_name_1,site_str_num,site_str_name,site_city&returnGeometry=false&f=json&resultRecordCount=10'https://www.gis.hctx.net/arcgis/rest/services/HCAD/Parcels/MapServer/0/query?where=UPPER(owner_name_1) LIKE UPPER('%SMITH%')&outFields=HCAD_NUM,owner_name_1,site_str_num,site_str_name,site_city&returnGeometry=false&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| HCAD_NUM | HCAD Parcel Number | YES |
| acct_num | Account Number | YES |
| owner_name_1 | Owner Name (Primary) | YES |
| owner_name_2 | Owner Name 2 | YES |
| site_str_num | Site Street Number | YES |
| site_str_name | Site Street Name | YES |
| site_city | Site City | YES |
| site_zip | Site ZIP | YES |
| mail_addr_1 | Mailing Address | YES |
Harris County, Texas (Houston metro, pop. 4.7M, county seat Houston) is the most populous Texas county and third-most populous in the US. The data authority is HCAD, Harris Central Appraisal District, which maintains property appraisal records independently of the county government. 62 fields confirmed, including HCAD_NUM (parcel ID), acct_num, owner_name_1/2/3 (up to three ownership slots with own_pct_1/2/3 percentage shares), site_str_num, site_str_name, site_city, site_zip, mail_addr_1/2/3, mail_city, mail_state, mail_zip, land_use, land_value, bld_value, total_appraised_val, new_owner_date, and yr_impr. Owner name is public under the Texas Public Information Act; Texas Tax Code §25.025 allows certain categories of persons (peace officers, judges, domestic violence victims, and others) to request suppression of their home address from appraisal district records. Owner-name LIKE query confirmed live. Max record count = 1000 per query. The HCAD open-data hub at geo-harriscounty.opendata.arcgis.com provides bulk downloads. A sibling service on the same server covers HCAD_MUD (Municipal Utility District) boundaries.
Harris County Appraisal District (HCAD) GIS Division, https://geo-harriscounty.opendata.arcgis.com/
Harris County's HCAD Parcels layer exposes a parcel identifier (HCAD Parcel Number), owner names (Owner Name (Primary), Owner Name 2), and address fields (Site Street Number, Site Street Name, Site City, Site ZIP, Mailing Address). Use it for owner-name lookups and address-based parcel searches. All 9 listed fields accept queries. Served as an ArcGIS MapServer layer, which supports query operations but not write operations; last verified 2026-05-11.
/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 Harris County actually publishes, not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
www.gis.hctx.net serves Harris County, Texas 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 Harris County's MapServer layer on 2026-05-11. 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.
Harris County's layer is hosted by the county on www.gis.hctx.net. Public ArcGIS endpoints rarely rate-limit individual reads, but www.gis.hctx.net 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.