Charter Oak High School was created in 1894.
Charter Oak Unified School District was created in 1894.
Royal Oak High School opened in the mid sixties (1965?) and graduated its last class in 1985. Due to declining enrollment the Charter Oak Unified School District closed Sunflower and Ruddock Intermediate Schools, transferred all high school students to Charter Oak High School and converted Royal Oak into the district's sole middle school. (ROHS Class of 84)
Charter Oak Schoolhouse was created in 1873.
Charter Oak Bridge was created in 1991.
Charter Oak Firehouse was created in 1876.
Oak Harbor High School was created in 1906.
Oak Mountain High School was created in 1999.
Klein Oak High School was created in 1982.
Oak Forest High School was created in 1971.
Great Oak High School was created in 2004.
Oak Glen High School was created in 1963.
Oak Hills High School was created in 1958.