Public ArcGIS MapServer endpoint for New Castle County parcel data. URL, supported fields, and a working sample query, copy it, or open it directly in the UrbanKit parcel lookup tool.
https://gis.nccde.org/entserver/rest/services/Foundation/Base_Layers/MapServer/0PRCLIDParcel ID (APN)CNTCTLASTOwner Last Name / ContactADDRESSProperty Addresscurl -s 'https://gis.nccde.org/entserver/rest/services/Foundation/Base_Layers/MapServer/0/query?where=UPPER(CNTCTLAST)+LIKE+UPPER('%25SMITH%25')&outFields=PRCLID,CNTCTLAST,ADDRESS,OWNADDR&returnGeometry=false&f=json&resultRecordCount=10'https://gis.nccde.org/entserver/rest/services/Foundation/Base_Layers/MapServer/0/query?where=UPPER(CNTCTLAST)+LIKE+UPPER('%SMITH%')&outFields=PRCLID,CNTCTLAST,ADDRESS,OWNADDR&returnGeometry=false&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| PRCLID | Parcel ID (APN) | YES |
| CNTCTLAST | Owner Last Name / Contact | YES |
| OWNADDR | Owner Mailing Address | NO |
| ADDRESS | Property Address | YES |
New Castle County DE (Wilmington/Newark metro; county seat Wilmington; FIPS 10003; most populous of Delaware's 3 counties, pop. ~570,000) publishes a public ArcGIS MapServer parcel layer hosted by NCCDE GIS (Foundation/Base_Layers/MapServer/0, 'Parcels', ~203,753 features, no token required). Key fields: PRCLID (parcel ID / APN), CNTCTLAST (owner last name / contact, the searchable owner field), OWNADDR (owner mailing address), ADDRESS (property situs address). Owner-name search via UPPER(CNTCTLAST) LIKE UPPER('%NAME%') works. Verified 2026-06-20: UPPER(CNTCTLAST) LIKE UPPER('%SMITH%') returns Wilmington-area parcels. Delaware has only 3 counties (New Castle, Kent, Sussex); Kent and Sussex are served separately. Do not confuse with New Castle in Pennsylvania (Lawrence County, PA).
New Castle County Government, Office of Land Use / GIS (NCCDE), https://gis.nccde.org/
New Castle County's Parcels layer exposes a parcel identifier (Parcel ID (APN)), owner names (Owner Last Name / Contact), and address fields (Property Address). Use it for owner-name lookups and address-based parcel searches. 3 of 4 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 2026-06-20.
/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 New Castle County actually publishes, not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
gis.nccde.org serves New Castle County, Delaware 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 New Castle County's MapServer layer on 2026-06-20. 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.
New Castle County's layer is hosted by the county on gis.nccde.org. Public ArcGIS endpoints rarely rate-limit individual reads, but gis.nccde.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.