Public ArcGIS MapServer endpoint for Westchester County parcel data. URL, supported fields, and a working sample query, copy it, or open it directly in the UrbanKit parcel lookup tool.
https://gisservices.its.ny.gov/arcgis/rest/services/NYS_Tax_Parcels_Public/MapServer/1COUNTY_NAMECounty Name, filter with 'Westchester'PRIMARY_OWNERPrimary Owner NameADD_OWNERAdditional Owner NamePARCEL_ADDRParcel AddressSWIS_SBL_IDSWIS-SBL Parcel IdentifierPRINT_KEYPrint Key (tax map reference)MAIL_ADDRMailing Addresscurl -s 'https://gisservices.its.ny.gov/arcgis/rest/services/NYS_Tax_Parcels_Public/MapServer/1/query?where=COUNTY_NAME%3D'Westchester'+AND+UPPER(PRIMARY_OWNER)+LIKE+UPPER('%25SMITH%25')&outFields=COUNTY_NAME,PRIMARY_OWNER,PARCEL_ADDR,SWIS_SBL_ID,MUNI_NAME,TOTAL_AV&returnGeometry=false&f=json&resultRecordCount=10'https://gisservices.its.ny.gov/arcgis/rest/services/NYS_Tax_Parcels_Public/MapServer/1/query?where=COUNTY_NAME='Westchester'+AND+UPPER(PRIMARY_OWNER)+LIKE+UPPER('%SMITH%')&outFields=COUNTY_NAME,PRIMARY_OWNER,PARCEL_ADDR,SWIS_SBL_ID,MUNI_NAME,TOTAL_AV&returnGeometry=false&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| COUNTY_NAME | County Name, filter with 'Westchester' | YES |
| PRIMARY_OWNER | Primary Owner Name | YES |
| ADD_OWNER | Additional Owner Name | YES |
| PARCEL_ADDR | Parcel Address | YES |
| SWIS_SBL_ID | SWIS-SBL Parcel Identifier | YES |
| PRINT_KEY | Print Key (tax map reference) | YES |
| MUNI_NAME | Municipality Name | NO |
| MAIL_ADDR | Mailing Address | YES |
| PROP_CLASS | Property Class Code | NO |
| TOTAL_AV | Total Assessed Value | NO |
| FULL_MARKET_VAL | Full Market Value | NO |
| YR_BLT | Year Built | NO |
| SCHOOL_NAME | School District Name | NO |
75+ fields confirmed. Same NYS Tax Parcels Public statewide endpoint as New York County (Manhattan) and Suffolk County, filter by COUNTY_NAME='Westchester'. Westchester is the most affluent large county in the lower Hudson Valley (~1M residents), and a high-search-intent county for public notice tools. PRIMARY_OWNER is the assessed owner name. Municipalities within Westchester accessible via this layer include Yonkers, White Plains, New Rochelle, Mount Vernon, Scarsdale, Ardsley, Tarrytown, Port Chester, Mamaroneck, and 35+ other cities/towns/villages, all filtered by COUNTY_NAME='Westchester'. Data is NYS RPS annual roll export (ROLL_YR=2025 confirmed in live query). The Westchester County GIS portal at gis.westchestergov.com offers a browser-based property viewer but does NOT expose a separate county-run public parcel REST endpoint for owner-name search; the NYS statewide service is the only public REST option. For both Suffolk and Westchester, always pair COUNTY_NAME with the owner query (as shown in sampleQuery) to avoid cross-county false matches in this multi-county statewide layer.
NYS Office of Information Technology Services (ITS) GIS Program Office, https://www.its.ny.gov/gis
Westchester County's NYS_Tax_Parcels_Public layer exposes a parcel identifier (SWIS-SBL Parcel Identifier), owner names (Primary Owner Name, Additional Owner Name), and address fields (Parcel Address, Mailing Address). Use it for owner-name lookups and address-based parcel searches. 7 of 13 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 2026-05-14.
/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 Westchester County actually publishes, not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
gisservices.its.ny.gov serves Westchester County, New York 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 Westchester County's MapServer layer on 2026-05-14. 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.
Westchester County's layer is hosted by the county on gisservices.its.ny.gov. Public ArcGIS endpoints rarely rate-limit individual reads, but gisservices.its.ny.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.