Port Bolivar is an unincorporated area located in the Bolivar Peninsula census-designated place, in Galveston County, Texas, United States state of Texas within Galveston County and part of the Houston–Sugar Land–Baytown metropolitan area. As of 2000, Port Bolivar had a population of 1,200. The town is home to the historic Bolivar Lighthouse, which once guided ships entering Galveston Bay.