Tomball is a city in Harris County in the U.S. state of Texas, a part of the Houston metropolitan area.The population was 10,753 at the 2010 census. In 1907, the community of Peck was renamed Tomball for local congressman Thomas Henry Ball, who had a major role in the development of the Port of Houston.he city of Tomball is primarily served by FM 2920 (Main Street) east to west and State Highway 249 (Tomball Parkway) north to south. David Wayne Hooks Memorial Airport, a general aviation airport, is located outside of the Tomball city limits in northwest Harris County.