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.
This page is the endpoint reference. If you came here to find a specific property, the Collin County parcel search runs this same layer in your browser, no account and no API key.
Search Collin County parcelsHave a street address but not the parcel number? Find the parcel number by address.
https://gismaps.cityofallen.org/arcgis/rest/services/ReferenceData/Collin_County_Appraisal_District_Parcels/MapServer/1Field by field, whether any endpoint we index for Collin County answers it, and the evidence for each. We only call a field restricted when there is a stated reason we can cite. Everything else here is a fact about the services we index, not a claim about the law.
| Field | Status | Basis |
|---|---|---|
| APN | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| Owner name | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| Owner mailing address | Not published | No endpoint we index for this county documents this field, so a query cannot ask for it. That is a fact about the services we index, not a legal restriction, and not a statement that the county holds no such record. Where to request it. |
| Site address | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| Geometry | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| Land use | Not published | No endpoint we index for this county documents this field, so a query cannot ask for it. That is a fact about the services we index, not a legal restriction, and not a statement that the county holds no such record. Where to request it. |
| Zoning | Not published | No endpoint we index for this county documents this field, so a query cannot ask for it. That is a fact about the services we index, not a legal restriction, and not a statement that the county holds no such record. Where to request it. |
GIS_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')%20AND%20CAST(GIS_DBO_AD_Entity_confidential_%20AS%20VARCHAR(255))%20NOT%20LIKE%20'%25T%25'%20AND%20GIS_DBO_AD_Entity_confidential_%20IN%20('F')&outFields=GIS_DBO_Parcel_PROP_ID,GIS_DBO_AD_Entity_file_as_name,GIS_DBO_AD_Entity_situs_display,GIS_DBO_AD_Entity_confidential_&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%') AND CAST(GIS_DBO_AD_Entity_confidential_ AS VARCHAR(255)) NOT LIKE '%T%' AND GIS_DBO_AD_Entity_confidential_ IN ('F')&outFields=GIS_DBO_Parcel_PROP_ID,GIS_DBO_AD_Entity_file_as_name,GIS_DBO_AD_Entity_situs_display,GIS_DBO_AD_Entity_confidential_&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; CCAD publishes those accounts WITH the owner and marks them in GIS_DBO_AD_Entity_confidential_ (alias 'Confidential Flag (t/f)': measured 2026-10-25, 'T' on 1,598, 'F' on 435,783 and NULL on 15,003 of 452,384 rows). The registry's confidentialFlag marker names that column, so a flagged row is withheld on every hosted surface (the REST API, the hosted MCP and the free tools, under any spelling of the layer URL); the stdio MCP server (@urbankitstudio/mcp-atlas) adds the exclusion to its own owner query in its next release; add AND CAST(GIS_DBO_AD_Entity_confidential_ AS VARCHAR(255)) NOT LIKE '%T%' AND GIS_DBO_AD_Entity_confidential_ IN ('F') to any query of your own, as the sampleQuery does (measured 2026-10-25: 452,384 rows, 1,598 'T' and 15,003 with a NULL cell, and the CAST clause keeps 435,783, dropping both: a NULL cell fails closed). The IN list is confidentialFlag.safeValues, every distinct raw cell an unflagged owner holds (measured 2026-10-26 with returnDistinctValues): a cell that is not exactly 'F' drops out whatever the server's text handling does, and the IN clause alone, or both clauses together, keep the same 435,783 rows.
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 2026-10-25.
/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 2026-10-25. 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.