San Benito is a city in Cameron County, Texas, United States. The population was 24,250 at the 2010 census. On April 3, 2007, San Benito celebrated the 100th anniversary of its naming.The post office was named "Diaz" from April to May 1907. The San Benito Museum, Freddy Fender Museum and Conjunto Music Museum opened in the same building Nov. 17, 2007.On October 25, 1975, on the television show Hee Haw, Freddy Fender saluted his hometown of San Benito, population 15,177.San Benito is part of the Brownsville–Harlingen–Raymondville and the Matamoros–Brownsville metropolitan areas.