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For the 2025-26 school year, there are 2 public middle schools serving 88 students in Castlewood, SD.

The top ranked public middle schools in Castlewood, SD are Claremont Colony Elementary - 04 and Castlewood Middle School - 03. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Castlewood, SD public middle schools have an average math proficiency score of 43% (versus the South Dakota public middle school average of 39%), and reading proficiency score of 52% (versus the 49% statewide average). Middle schools in Castlewood have an average ranking of 6/10, which is in the top 50% of South Dakota public middle schools.

Minority enrollment is 7% of the student body (majority Hispanic), which is less than the South Dakota public middle school average of 42% (majority American Indian).