UrbanKit Studio — Free GIS & Mailing Tools for Planners

URBANKIT/STUDIO

FREE · NO SIGNUP

URBANKIT/STUDIO · EST. 2026 · ONLINEFREE · BROWSER-ONLY · NO TELEMETRY · OPEN SOURCE

ATLAS · STATE·CA

California county
parcel REST APIs.

2 counties indexed. ArcGIS FeatureServer and MapServer URLs, with supported search fields per layer.

Counties indexed in this state, with endpoint counts, supported fields, and status.
County	Endpoints	Searchable fields	Status	Action
Los Angeles County	1	Assessor Identification Number (AIN) · Situs Address	UNVERIFIED	OPEN
Sonoma County	1	Assessor's Parcel Number · Situs Address	UNVERIFIED	OPEN

Listing missing or moved? Tell us — we verify and update weekly.

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?

100% browser-based — Your data never leaves your computer. All processing happens locally.
Free to use — No account required, no subscription fees.
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. Every tool is free, runs entirely in the browser, and requires no account or personal information.

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?: Yes. All processing happens entirely in your browser. Your CSV files, GeoJSON data, and generated PDFs never leave your computer. We don't store, transmit, or have access to any of your data.
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.

View all FAQs →

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

How to Get Parcel GeoJSON Data
Avery 5160 Printing Tips
Public Notice Radius Requirements
Deduplicating Mailing Lists
What is GeoJSON?
How to Find an ArcGIS Parcel Layer URL
What is an APN (Assessor's Parcel Number)?
Understanding Parcel Data Fields
Avery 5160 Labels Not Printing Correctly?

View all resources →