There are 3 US Post Offices in Somervell County serving a total of 8,413 residents equating to 2,804 residents per post office. It's estimated that approximately 13,428 packages are handled across the 3 county post offices annually. Somervell County is a county located on the Edwards Plateau in the U.S. state of Texas. As of the 2010 census, its population was 8,490. Its county seat is Glen Rose. The county is named for Alexander Somervell, Secretary of War for the Republic of Texas. Somervell County is included in the Dallas-Fort Worth-Arlington, TX Metropolitan Statistical Area and the Granbury Micropolitan Area. The county contains the Comanche Peak Nuclear Generating Station, one of two nuclear power plants in Texas.