Rio Americano High School, colloquially known as Rio, is a public high school in Sacramento, California, serving students in grades 9 through 12 as part of the San Juan Unified School District. Rio Americano students come from the surrounding areas of Arden Park, Arden Oaks, Sierra Oaks, Fair Oaks, Carmichael, Gold River, and to a much lesser extent, the La Sierra community.