Santo, TexasSanto is an unincorporated community and census designated place in Palo Pinto County, Texas, United States. It lies on Farm to Market Road 4, 14 miles south of Palo Pinto, and has an estimated population of 315.EducationThe Santo Independent School District serves area students.DemographicsSanto first appeared as a census designated place in the 2020 U.S. census.