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For the 2025-26 school year, there are 5 public high schools serving 1,163 students in Dewey County, SD.

The top ranked public high schools in Dewey County, SD are Timber Lake High School - 01, E. A. G. L. E. Center High School - 07 and Eagle Butte High School - 01. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Dewey County, SD public high schools have an average math proficiency score of 27% (versus the South Dakota public high school average of 40%), and reading proficiency score of 36% (versus the 63% statewide average). High schools in Dewey County have an average ranking of 2/10, which is in the bottom 50% of South Dakota public high schools.

Dewey County, SD public high school have a Graduation Rate of 57%, which is less than the South Dakota average of 82%.

The school with highest graduation rate is Timber Lake High School - 01, with ≥80% graduation rate. Read more about public school graduation rate statistics in South Dakota or national school graduation rate statistics.

Minority enrollment is 95% of the student body (majority American Indian), which is more than the South Dakota public high school average of 35% (majority American Indian).