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For the 2025-26 school year, there is 1 public high school serving 106 students in Castlewood, SD.

The top-ranked public high school in Castlewood, SD is Castlewood High School - 01. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Castlewood, SD public high school have an average math proficiency score of 50% (versus the South Dakota public high school average of 40%), and reading proficiency score of 50% (versus the 63% statewide average). High schools in Castlewood have an average ranking of 6/10, which is in the top 50% of South Dakota public high schools.

Castlewood, SD public high school have a Graduation Rate of 50%, which is less than the South Dakota average of 82%.

The school with highest graduation rate is Castlewood High School - 01, with ≥50% graduation rate. Read more about public school graduation rate statistics in South Dakota or national school graduation rate statistics.

Minority enrollment is 8% of the student body (majority Hispanic), which is less than the South Dakota public high school average of 35% (majority American Indian).