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ATLAS · STATE·DE

Delaware county
parcel REST APIs.

1 county indexed. ArcGIS FeatureServer and MapServer URLs, with supported search fields per layer.

Endpoint URLs · 1 county

New Castle County, DEhttps://gis.nccde.org/entserver/rest/services/Foundation/Base_Layers/MapServer/0

Looking for one property instead of an endpoint? Type a Delaware street address into Find My Parcel Number and it returns the parcel number from the county's own records.

Counties indexed in this state, with endpoint counts, supported fields, and the registry's listing status. The registry listing is a curation record, not a live check — see the status page for what the liveness probe last observed.
County	Endpoints	Searchable fields	Registry listing	Action
New Castle County	1	Parcel ID (APN) · Owner Last Name / Contact · Property Address	LISTED LIVE	Open

Questions, with answers

Delaware parcel REST API, common questions

Which Delaware counties publish a public parcel ArcGIS REST API?

1 Delaware county is indexed in the UrbanKit atlas with a verified public REST endpoint: New Castle. It exposes an owner-name field you can search directly on the public layer.

How do I search Delaware parcels by owner name?

New Castle exposes an owner-name field on the public REST layer. New Castle, for example, uses the CNTCTLAST field. A case-insensitive search is ?where=UPPER(CNTCTLAST)%20LIKE%20UPPER('%25SMITH%25')&outFields=*&f=json. Open a county's page here for its full field list and a ready-to-run sample query.

What is the ArcGIS REST URL for parcels in New Castle, Delaware?

New Castle publishes parcels at https://gis.nccde.org/entserver/rest/services/Foundation/Base_Layers/MapServer/0, a MapServer (layer 0). It indexes by Parcel ID (APN), Owner Last Name / Contact, and Property Address. Owner-name search: UPPER(CNTCTLAST) LIKE UPPER('%25SMITH%25').

Listing missing or moved? and include its current URL if you have it. A full four-shard sweep checks every endpoint every two hours, with degraded endpoints re-checked every 30 minutes.

UrbanKit Studio

Free online tools for urban planners and local government staff

Our Tools

Public Notice Radius Mailing List Generator

Generate mailing lists for public notice requirements. Upload parcel GeoJSON data, enter a project address, set a buffer distance (e.g., 500 feet), and automatically identify all property owners within the notification radius. Export as CSV or print-ready Avery 5160 labels.

Use cases: Zoning variances, conditional use permits, rezoning applications, subdivision plats, environmental reviews, historic preservation notices.

CSV to Avery 5160 Label Maker

Convert any CSV mailing list into print-ready Avery 5160 label sheets. Upload your spreadsheet, map columns to address fields, preview your labels, and download a PDF formatted for standard 30-label sheets (1" × 2⅝" labels).

Use cases: Public notice mailings, bulk mail campaigns, event invitations, holiday cards, business mailings.

Parcel & Property Lookup Tool

Connect to any county's ArcGIS Feature Layer and search parcels by APN, address, or owner name. Instantly retrieve property details, zoning designations, assessed values, mailing addresses, and ownership information, all from your browser.

Paste any ArcGIS REST Feature Layer URL (e.g., from your county GIS portal) and the tool automatically detects searchable fields. Results display all available parcel attributes with one-click copy and print support.

Use cases: Property research, title searches, zoning verification, public notice preparation, development feasibility analysis, neighborhood analysis.

Why UrbanKit Studio?

What stays local: CSVs you map into labels, GeoJSON you upload for a radius, and the PDFs and CSVs you generate stay on your device. See the privacy policy for the tools that use our servers.
Free to use: The browser tools need no account and no subscription.
Built for planners: Designed by someone who understands public notice requirements and local government workflows.
Automatic deduplication: Removes duplicate addresses to save postage and label stock.

About UrbanKit Studio

UrbanKit Studio was built by a planner who got tired of the clunky, expensive workflows involved in generating public notice mailing lists. What should take minutes (buffering parcels, pulling owner addresses, deduplicating, and printing labels) often takes hours using legacy GIS tools or expensive subscription software.

Our mission is to make essential planning tools accessible to everyone: small municipalities that can't afford enterprise GIS, solo practitioners handling their first variance application, and community members who want to participate in the planning process. The browser tools are free and need no account. CSVs you map into labels, GeoJSON you upload for a radius, and the PDFs and CSVs you generate stay on your device. See the privacy policy for the tools that use our servers.

We're actively building new tools and expanding coverage. If you have ideas or feedback, we'd love to hear from you.

Frequently Asked Questions

What is public notice radius notification?: Most cities and counties require that property owners within a certain distance of a proposed development be notified of upcoming public hearings. Typical distances range from 200 to 500 feet, though requirements vary by jurisdiction and project type (variances, CUPs, rezonings, subdivisions).
Where do I get parcel GeoJSON data?: Check your county assessor or GIS department. Many offer free parcel downloads through open data portals. State GIS clearinghouses and services like Regrid.com also provide parcel data. If you have a Shapefile, convert to GeoJSON using mapshaper.org or QGIS.
What are Avery 5160 labels?: Avery 5160 is the most popular mailing label format in the US. Each 8.5" × 11" sheet contains 30 labels (1" × 2⅝" each) arranged in a 3×10 grid. They work with both inkjet and laser printers and are sold at office supply stores, Amazon, and Avery's website.
Is my data secure?: CSVs you map into labels, GeoJSON you upload for a radius, and the PDFs and CSVs you generate stay on your device. Three features send your lookups to our servers, where we may cache the county's response for up to 7 days: bulk enrichment, which sends us the addresses you paste or load from a CSV; auto-county radius lookups; and the parcel atlas API and MCP server. When one of those three looks up an address, our servers pass it to the U.S. Census Bureau's geocoder and cache the Census response, including the matched address, for up to 30 days. The Owner Lookup and Find My Parcel Number pages also send the address you type through our servers to the Census geocoder, but we keep no copy of the answer, only a count of which county it fell in. Property reports, the radius map's address box and the zoning case pages with an address search go straight from your browser to the city's open-data portal or to a public geocoder (the Census Bureau, OpenStreetMap's Nominatim or NYC Planning Labs GeoSearch), and those requests never pass through our servers. The privacy policy lists what we keep.
How does the Parcel Lookup tool work?: Paste any ArcGIS REST Feature Layer URL from your county's GIS portal. The tool loads the layer's metadata to discover available fields, then lets you search by any field (APN, address, owner name). Results show all parcel attributes with one-click copy. It works with any county or municipality that publishes an ArcGIS REST service.
Can I use these tools on mobile?: Yes, UrbanKit Studio is fully responsive. However, for the best experience with the map-based Radius Notice tool, we recommend a desktop or laptop computer.

Contact Us

Have a question, feature request, or bug report? We'd love to hear from you. Use our contact form and we'll respond within 1–2 business days.

What we can help with:

Technical support for any of our tools
Feature requests and suggestions for new planning utilities
Bug reports and data format questions
Partnership and integration opportunities

Resources & Guides

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