How to Find Property Owners, Parcel Boundaries, and Lot Information in Harris County (HCAD Guide)

Use the HCAD Parcel Viewer to find property owner names, parcel boundaries, lot size, and tax information anywhere in Houston.

The Harris County Appraisal District (HCAD) Parcel Viewer is one of the most powerful tools for understanding land ownership in Houston.

Whether you’re trying to find who owns a property, research a development site, or understand parcel boundaries on your block, this step-by-step guide will show you exactly how to use it.

Access the Viewer

What You Can Find Using the HCAD Parcel Viewer

With just an address or owner name, you can quickly find:

Property owner name
Parcel boundaries and lot shape
Lot size and square footage
Appraised and market value
Property (HCAD) account number
Tax jurisdiction details
Subdivision and legal description

This tool is widely used for community organizing, real estate research, and understanding development patterns in Houston.

If you’re working with multiple properties or doing deeper research, you don’t have to look up parcels one by one. HCAD provides a public ArcGIS API at: https://arcweb.hcad.org

This allows you to query parcel data directly and pull structured results (JSON) that can be used in tools like Google Sheets, Notion, or custom apps.

Example API Query

Here’s a sample request using a parcel’s HCAD account number:

			
https://arcweb.hcad.org/server/rest/services/public/public_query/MapServer/0/query?f=json&where=HCAD_NUM%20%3D%20%270052270000023%27&outFields=*

This returns:

Owner name
Address
Appraised value
Parcel details
And more

You can plug this directly into Google Sheets using IMPORTDATA or similar tools to build your own datasets.

Instead of clicking parcel-by-parcel in the viewer, you can: query multiple account numbers, build a spreadsheet of owners, analyze ownership patterns across a corridor

HCAD account numbers (HCAD_NUM) often include leading zeroes, and those must be preserved in your query.

Example:

✅ Correct: 0052270000023
❌ Incorrect: 52270000023

If you remove the leading zeroes:

The query may fail
Or return incorrect results

Always treat account numbers as text (not numbers) when working in spreadsheets or code.

If you’re working in Google Sheets:

Format your column as Plain Text
Or add a leading ' (apostrophe) before the number

This ensures the full account number is preserved.

With the API, you can:

Build your own parcel database
Track property ownership across multiple parcels
Automate outreach lists
Integrate parcel data into maps and dashboards

Need Help Finding Property Information?

A Tale of Two Bridges works with residents, property owners, and community groups to better understand land ownership, parcel data, and development patterns across Houston.

Whether you’re: