Public ArcGIS MapServer endpoint for Chester 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 Chester County parcel search runs this same layer in your browser, no account and no API key.
Search Chester County parcelsHave a street address but not the parcel number? Find the parcel number by address.
https://mapservices.pasda.psu.edu/server/rest/services/pasda/ChesterCounty/MapServer/11Field by field, whether any endpoint we index for Chester 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 | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| 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 | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| 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. |
UPIParcel ID (UPI, Uniform Parcel Identifier)OWN1Owner NameLOC_ADDRESSitus AddressADDR1Owner Mailing Address (street line)curl -s 'https://mapservices.pasda.psu.edu/server/rest/services/pasda/ChesterCounty/MapServer/11/query?where=UPPER(OWN1)+LIKE+UPPER('%25SMITH%25')&outFields=UPI,OWN1,LOC_ADDRES,ADDR1,ADDR2,ZIP1&returnGeometry=false&resultRecordCount=10&f=json'https://mapservices.pasda.psu.edu/server/rest/services/pasda/ChesterCounty/MapServer/11/query?where=UPPER(OWN1)+LIKE+UPPER('%SMITH%')&outFields=UPI,OWN1,LOC_ADDRES,ADDR1,ADDR2,ZIP1&returnGeometry=false&resultRecordCount=10&f=jsonOpen this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| UPI | Parcel ID (UPI, Uniform Parcel Identifier) | YES |
| OWN1 | Owner Name | YES |
| OWN2 | Owner Name 2 | NO |
| LOC_ADDRES | Situs Address | YES |
| ADDR1 | Owner Mailing Address (street line) | YES |
| ADDR2 | Owner Mailing City and State | NO |
| ADDR3 | Owner Mailing Address line 3 | NO |
| ZIP1 | Owner Mailing ZIP | NO |
| PIN_MAP | Map PIN | NO |
| MUNI | Municipality Code | NO |
| LUC | Land Use Code | NO |
| TOT_ASSESS | Total Assessed Value | NO |
| ACRE_PLAN_ | Acres (plan) | NO |
Chester County, Pennsylvania (West Chester; FIPS 42029). The county's parcels are published through PASDA (Pennsylvania Spatial Data Access, the state clearinghouse run by Penn State) as ChesterCounty MapServer layer 11, 'Chester County Parcels 202610': 194,767 parcels on 2026-10-10, 193,293 of them with an owner (1,474 have a blank OWN1). The data is county-supplied; the host is PASDA, not the county. PASDA REPUBLISHES MONTHLY under a new vintage stamp: the layer name carries the month (202610) and the name, and possibly the index, rotates on each republish, as it does for Bradford in this file. If the liveness probe flags this record, list the service's layers and pick the one whose name starts 'Chester County Parcels'. USE THIS HOST ONLY: an older copy at maps.pasda.psu.edu/arcgis (ChesterCounty MapServer 11, vintage 202312) answers 'Service not started' and is dead. The owner is OWN1 with OWN2; the situs is LOC_ADDRES (house number, street and type in one string, also split as ST_NUM, DIR, ST_NAME and ST_TYPE; blank on 7,747 rows, about 4%); the owner mailing address is ADDR1 (the street line) with ADDR2 (city and state in one string) and ADDR3 (usually blank), plus ZIP1; the parcel id is UPI (the Uniform Parcel Identifier, the county's tax id), with the map PIN in PIN_MAP and PIN_COMMON. MUNI is a numeric municipality code. Currency: MODIFY_DAT and ASMT_DATE (text dates) both peak at 2026-09-17, so owners are about three weeks behind the assessment office at this vintage. CORS: the server echoes the request Origin in Access-Control-Allow-Origin, also on the preflight. maxRecordCount is 1000 with pagination. No license or terms text is published on the service or layer. TLS: Python's Windows trust store has rejected this host's certificate chain; Node's fetch and curl accept it. Verified 2026-10-10: a count, resultRecordCount=1, an owner LIKE query (1,234 rows for %SMITH%), a situs LIKE query on MAIN ST (718 rows) and a point query at the county's internal point (one parcel, with an owner).
Chester County Geographic Information Services (supplies the data); PASDA, Penn State (hosts the layer), https://chester-county-s-gis-hub-chesco.hub.arcgis.com/
Chester County's Chester County Parcels 202610 layer exposes a parcel identifier (Parcel ID (UPI, Uniform Parcel Identifier)), owner names (Owner Name, Owner Mailing Address (street line)), and address fields (Situs Address). Use it for owner-name lookups and address-based parcel searches. 4 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 2026-10-10.
/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 Chester County actually publishes, not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
mapservices.pasda.psu.edu serves Chester County, Pennsylvania 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 Chester County's MapServer layer on 2026-10-10. 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.
Chester County's layer is hosted by the county on mapservices.pasda.psu.edu. Public ArcGIS endpoints rarely rate-limit individual reads, but mapservices.pasda.psu.edu 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.