San Antonio, or unofficially San Ann as the locals call it, is a city in Pasco County, Florida, United States. It is a suburban city included in the Tampa-St. Petersburg-Clearwater, Florida Metropolitan Statistical Area. It lies within Florida's 5th congressional district. The population was 1,138 at the 2010 census.
San Antonio was founded (in name only) in 1881 by Edmund F. Dunnewho previously had been chief justice of the Arizona territory. Dunne was a legal counsel involved in the Disston Land Purchase, and as his commission, received 100,000 choice acres (400 km2) of land out of the 4,000,000 acre (16,000 km²) purchase. The following year on February 15, while surveying the Disston Purchase with his cousin, Captain Hugh Dunne,Judge Dunne selected the city's location and began settling it. He established the city as the center of a Catholic colony in Florida. Dunne planned several other villages for the surrounding area including Saint Joseph, Saint Thomas, Villa Maria, Carmel and San Felipe, but only the rural community of Saint Joseph survives today. In 1889 the Benedictines established the monastery of St. Leo and St. Leo College on Dunne's former homestead and farm land, later incorporating the area as part of a separate town, St. Leo, Florida. At the time of its founding San Antonio was located in the southern third of Hernando County, as Pasco County was not created until 1887. The Orange Belt Railway first began service to San Antonio in November 1887.