GIS Data

The Protest Deadline for most property owners in Williamson County was May 15, 2023.

See your Notice of Appraised Value for your specific deadline.

Here are a few documents that might be helpful:

Additional Open Records File Layout
Certified/Supplement Roll File Layout
File Layout for the tables updated daily
Property Data Export File Layout

WCAD’s data is presented in various formats and file types. Click on a data type below to view all of the downloadable content available within.

GIS Data, Parcels, and Subdivision boundaries are updated nightly. The others are updated quarterly in January, April, July, and October.

Certified Data Preliminary Data Historical Data GIS Data Agent Data

Preview	Description	Posted	Download
N/A	Data Field Layout: Field descriptions and data types Data Type: PDF 19 pages 574 KB	2019/07/29
N/A	Map Pages: Full set of WCAD’s maps Data Type: PDF 2,075 pages 1 GB	2021/01/01
	Page Index: Page index for PDF formatted WCAD maps Data Type: Polygon	2021/01/01
	Abstracts: Original land grant surveys Data Type: Polygon	2021/01/01
	Cadastral Lines: Linework that corresponds with all polygon edges Data Type: Line	2021/01/01
	Community College Boundaries: Community college taxing areas Data Type: Polygon	2021/01/01
	City Boundaries: City limits Data Type: Polygon	2021/01/01
	County Boundary: County area Data Type: Polygon	2021/01/01
	Defined Areas: Boundaries of Defined areas Data Type: Polygon	2021/01/01
	ESD Boundaries: Boundaries of Emergency Service Districts Data Type: Polygon	2021/01/01
	ISD Boundaries: Boundaries of Independent School Districts Data Type: Polygon	2021/01/01
	Limited District Boundaries: Boundaries of Limited Districts Data Type: Polygon	2021/01/01
	MUD Boundaries: Boundaries of Municipal Utility Districts Data Type: Polygon	2021/01/01
	Parcels: Parcels Data Type: Polygon	Nightly
	PID Boundaries: Boundaries of Public Utility Districts Data Type: Polygon	2021/01/01
	Road District Boundaries: Boundaries of Road Districts Data Type: Polygon	2021/01/01
	Subdivision Boundaries: Subdivision boundaries Data Type: Polygon	Nightly
	TIF Boundaries: Taxing Indriment Financing zones Data Type: Polygon	2021/01/01
	Watershed Boundaries: Boundaries of Watershed areas Data Type: Polygon	2021/01/01
	WC & ID Boundaries: Water Control & Improvement District boundaries Data Type: Polygon	2021/01/01
	WS & ID Boundaries: Water Sewer Improvement District boundaries Data Type: Polygon	2021/01/01