Sweetwater Union High School (commonly referred to as SUHi and SUH within the district) is a secondary school located in National City, California, United States. Established in 1920, it is one of the oldest high schools in San Diego County. Flagship of the Sweetwater Union High School District, SUHI predominantly serves the National City community with an enrollment of 2,675 students. In 2009, Sweetwater High School was named on Newsweek's list of the top 1,500 public high schools in the United States. In 2016 it ranked 2065th on U.S. News & World Report's list of best high schools.