There are 4 US Post Offices in Jack County serving a total of 8,586 residents equating to 2,147 residents per post office. It's estimated that approximately 13,704 packages are handled across the 4 county post offices annually. Jack County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 9,044. Its county seat is Jacksboro. The county was created in 1856 and organized the next year. It is named for Patrick Churchill Jack and his brother William Houston Jack, both soldiers of the Texas Revolution. Republican Drew Springer, Jr., a businessman from Muenster in Cooke County, has since January 2013 represented Jack County in the Texas House of Representatives."