Pleasanton is a city in Atascosa County, Texas, United States. The population was 8,934 at the 2010 census. Pleasanton's official motto is "The City of Live Oaks and Friendly Folks." It is part of the San Antonio-New Braunfels Metropolitan Statistical Area.Pleasanton honors its cowboy heritage with the "Mr. Cowboy" sculpture in front of City Hall and across from the giant oak tree downtown.