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For the 2026 school year, there are 4 public schools serving 1,411 students in Johnston, SC (there are , serving 226 private students). 86% of all K-12 students in Johnston, SC are educated in public schools (compared to the SC state average of 92%).

The top-ranked public schools in Johnston, SC are Strom Thurmond High School, Johnston-edgefield-trenton Middle School and Johnston Elementary School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Johnston, SC public schools have an average math proficiency score of 22% (versus the South Carolina public school average of 43%), and reading proficiency score of 43% (versus the 52% statewide average). Schools in Johnston have an average ranking of 3/10, which is in the bottom 50% of South Carolina public schools.

Minority enrollment is 64% of the student body (majority Black), which is more than the South Carolina public school average of 53% (majority Black).