There are 7 US Post Offices in Robertson County serving a total of 15,758 residents equating to 2,251 residents per post office. It's estimated that approximately 25,152 packages are handled across the 7 county post offices annually. Robertson County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 16,622. Its county seat is Franklin. The county was created in 1837 and organized the following year. It is named for Sterling C. Robertson, an early settler who signed the Texas Declaration of Independence. Robertson County is part of the College Station-Bryan, TX Metropolitan Statistical Area."