Williamson County Jester Annex
Commissioner Precinct One
1801 East Old Settlers Blvd.
Suite #110
Round Rock, TX 78664
Phone: (512) 244-8610
Fax: (512) 244-8616
Driving Directions

Doris Sanchez
Communications Specialist
(512) 244-8610 Direct Line

Garry Brown
Executive Assistant
(512) 244-8615

Commissioner Precinct One, Terry Cook

Terry believes elected officials should be responsive to all of the people they represent. She knows that once a candidate is elected to office, he or she makes the duties and responsibilities a top priority. As a member of the Williamson County Commissioners Court, Terry works tirelessly to ensure that the Court manages county business and its resources consistent with her vision to benefit all county residents in a fair and non-partisan manner. Making certain that our county funds are used responsibly, Terry pledges to keep Williamson County a place where every man, woman, and child has quality, fulfilling lives without onerous tax and debt burdens.

She has a master’s degree in biomedical engineering from Duke University and worked in research and high-tech industries for 20+ years, and also has business perspective as a small business owner here in Williamson County. She has extensive experience in managing people and projects, budgeting, and contract negotiation with companies small and large alike.

Terry tirelessly urges civic engagement and strongly encourages others to do the same. She has been a volunteer deputy voter registrar for Bell, Travis, and Williamson counties registering voters from all over the region. She also has served in Williamson County as an elections clerk, and as an alternate judge during elections. In addition, she was a Colorado Master Gardener in a county with the most extensive public outreach program in the state. She also has been involved in planning and design of public parks and management of open space.

Terry and her husband, Wayne, have called Round Rock their home for over eleven years. She enjoys interior and landscape design, unique dining experiences, traveling, Bible study, live theatre, and music.


To lead pro-actively on the Williamson County Commissioners Court while advocating for the constituents of Precinct 1 and the county at-large from a foundation of collaboration and respect.


To transform Williamson County government into a more accessible, responsive, transparent, and well-managed organization for our residents, so that we become the community recognized as the best in central Texas to live and enjoy.


Accountability, commitment, integrity, and respect form the core values that guide the Williamson County Commissioner Precinct 1 office.