Santa Anna, Starr County, TexasSanta Anna is a census-designated place in Starr County, Texas, United States. This was a new CDP for the 2010 census, with a population of 13.GeographySanta Anna is located at .DemographicsSanta Anna first appeared as a census designated place in the 2010 U.S. census.EducationThe CDP is within the San Isidro Independent School District.