Public ArcGIS MapServer endpoint for Collin County parcel data. URL, supported fields, and a working sample query, copy it, or open it directly in the UrbanKit parcel lookup tool.
https://gismaps.cityofallen.org/arcgis/rest/services/ReferenceData/Collin_County_Appraisal_District_Parcels/MapServer/1GIS_DBO_AD_Entity_file_as_nameOwner NameGIS_DBO_AD_Entity_situs_displaySitus AddressGIS_DBO_Parcel_PROP_IDProperty ID (key)GIS_DBO_Parcel_GEO_IDGeographic IDcurl -s 'https://gismaps.cityofallen.org/arcgis/rest/services/ReferenceData/Collin_County_Appraisal_District_Parcels/MapServer/1/query?where=UPPER(GIS_DBO_AD_Entity_file_as_name)%20LIKE%20UPPER('%25SMITH%25')&outFields=GIS_DBO_Parcel_PROP_ID,GIS_DBO_AD_Entity_file_as_name,GIS_DBO_AD_Entity_situs_display&returnGeometry=false&f=json&resultRecordCount=10'https://gismaps.cityofallen.org/arcgis/rest/services/ReferenceData/Collin_County_Appraisal_District_Parcels/MapServer/1/query?where=UPPER(GIS_DBO_AD_Entity_file_as_name) LIKE UPPER('%SMITH%')&outFields=GIS_DBO_Parcel_PROP_ID,GIS_DBO_AD_Entity_file_as_name,GIS_DBO_AD_Entity_situs_display&returnGeometry=false&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| GIS_DBO_AD_Entity_file_as_name | Owner Name | YES |
| GIS_DBO_AD_Entity_situs_display | Situs Address | YES |
| GIS_DBO_Parcel_PROP_ID | Property ID (key) | YES |
| GIS_DBO_Parcel_GEO_ID | Geographic ID | YES |
Collin County, Texas (Plano / Frisco / McKinney, pop. ~1.1M, among the fastest-growing US counties) publishes Collin Central Appraisal District (CCAD) parcels through a City of Allen ArcGIS MapServer. Owner search uses the joined field GIS_DBO_AD_Entity_file_as_name; the situs (site) address is GIS_DBO_AD_Entity_situs_display; the parcel key is GIS_DBO_Parcel_PROP_ID. The GIS_DBO_ table-join prefixes must be used verbatim in WHERE clauses. Owner LIKE query confirmed live 2026-05-30. Texas Tax Code §25.025 lets protected persons (peace officers, judges, family-violence victims) suppress owner/address records.
Collin Central Appraisal District (CCAD), hosted via City of Allen GIS, https://www.collincad.org/
Collin County's Collin County Appraisal District Parcels layer exposes owner names (Owner Name) and address fields (Situs Address). 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 2026-05-30.
/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 Collin County actually publishes, not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
gismaps.cityofallen.org serves Collin 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 Collin County's MapServer layer on 2026-05-30. 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.
Collin County's layer is hosted by the county on gismaps.cityofallen.org. Public ArcGIS endpoints rarely rate-limit individual reads, but gismaps.cityofallen.org 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.