Williamson County GIS and Addressing staff provides the addressing for the unincorporated areas of the County as well as for several of the smaller incorporated Cities. Our addressing staff is currently awaiting final approval of Williamson County 911 Addressing Guidelines; please review the draft version - Williamson County Addressing Guidelines (PDF).

Review a basic list of agreed-upon addressing guidelines by the addressing jurisdictions within Williamson County - Basic Addressing Guidelines (PDF).

In addition, the staff maintains the master address database that drives the 911 landline telephone system for the entire County.

Valid Address Search

This tool allows you to search for all valid addresses at the time of the data load (the data is updated approximately once per month). If you need the most current, up-to-the-minute data, please contact us.

Information Regarding Street Names

Williamson County Addressing Department does not allow street names that are duplicated in the County. You should check current and reserved streets, as we will verify both as well. Please keep in mind that all street names in the County must still be approved through our office, this tool is just provided to help expedite service in selecting street names. We will provide to you proof of approval. 

For more information, please email our Addressing Department.