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For the 2025 school year, there are 149 public schools serving 100,437 students in Dekalb County, GA (there are , serving 13,893 private students). 88% of all K-12 students in Dekalb County, GA are educated in public schools (compared to the GA state average of 91%).

The top ranked public schools in Dekalb County, GA are Kittredge Magnet School, Wadsworth Magnet School For High Achievers and Oakhurst Elementary School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Dekalb County, GA public schools have an average math proficiency score of 26% (versus the Georgia public school average of 38%), and reading proficiency score of 34% (versus the 40% statewide average). Schools in Dekalb County have an average ranking of 5/10, which is in the bottom 50% of Georgia public schools.

Minority enrollment is 87% of the student body (majority Black), which is more than the Georgia public school average of 65% (majority Black).