High Quality Content by WIKIPEDIA articles! San Benito is a city in Cameron County, Texas, United States. The population was 24,250 at the 2010 census. It is the birthplace of Country and Tex-Mex music icon Freddy Fender. San Benito celebrated the 100th anniversary of the naming of the city April 3, 2007. 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.