Public ArcGIS MapServer endpoint for Allegheny County parcel data. URL, supported fields, and a working sample query — copy it, or open it directly in the UrbanKit parcel lookup tool.
https://gisdata.alleghenycounty.us/arcgis/rest/services/EGIS/Web_Parcels/MapServer/0/query?where=PIN+LIKE+'%0364%'&outFields=PIN,MAPBLOCKLOT&returnGeometry=false&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| PIN | Parcel Identification Number | YES |
| MAPBLOCKLOT | Map-Block-Lot Reference | YES |
Only 5 fields on the public Web_Parcels endpoint: OBJECTID, PIN, MAPBLOCKLOT, SHAPE, SHAPE.STArea(), SHAPE.STLength(). This is geometry + parcel ID only — owner name is NOT exposed on the public REST layer. The EGIS folder on gisdata.alleghenycounty.us contains only 4 services (Web_Parcels, Buildings, Municipalities, AC_AddressPointsWithLabels). Full owner/address data is accessible through the Allegheny County Real Estate portal at alleghenyco.us/property-assessment and the county's block-lot lookup at property.alleghenycounty.us — these are browser-only, not REST-queryable. The WPRDC open data portal at data.wprdc.org has property assessment data as a CSV/API download.
Allegheny County Department of Information Technology — GIS Division — https://openac-alcogis.opendata.arcgis.com/
/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 this county actually publishes — not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
Many county servers allow public reads but block browser cross-origin requests. The UrbanKit parcel lookup tool fetches directly from your browser; if it works there, the layer is technically public. For your own integration, you may need a same-origin proxy or server-side fetch.
Possibly — counties move services without warning. We re-verify entries weekly and flag stale ones. If you're seeing a fresh 404, please let us know and we'll update the listing.
Most are. Public ArcGIS layers don't typically rate-limit individual reads, but heavy programmatic use can trigger throttling at the host level. Be respectful — query what you need.