There are 6 US Post Offices in Potter County serving a total of 8,801 residents equating to 1,467 residents per post office. It's estimated that approximately 14,047 packages are handled across the 6 county post offices annually. Potter County is a county located in the U.S. state of Texas. As of the 2010 census, the population was 121,073. Its county seat is Amarillo. The county was created in 1876 and organized in 1887. It is named for Robert Potter, a politician, signer of the Texas Declaration of Independence and the Secretary of the Texas Navy. Potter County is included in the Amarillo, TX Metropolitan Statistical Area."