Bacliff is a census-designated place in north-central Galveston County, Texas, United States, 16 miles northwest of Galveston. The population was 9,677 at the 2020 census, up from 8,619 at the 2010 census. Bacliff, originally called Clifton-by-the-Sea, began as a seaside resort town. Located on the western shore of Galveston Bay, Bacliff, along with S…Bacliff is a census-designated place in north-central Galveston County, Texas, United States, 16 miles northwest of Galveston. The population was 9,677 at the 2020 census, up from 8,619 at the 2010 census. Bacliff, originally called Clifton-by-the-Sea, began as a seaside resort town. Located on the western shore of Galveston Bay, Bacliff, along with San Leon and Bayview, are the largest unincorporated communities on the Galveston County mainland.