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For the 2025 school year, there are 24 public schools serving 9,716 students in Williamson County, IL (there are , serving 562 private students). 95% of all K-12 students in Williamson County, IL are educated in public schools (compared to the IL state average of 88%).

The top ranked public schools in Williamson County, IL are Carterville High School, Washington Elementary School and Carterville Jr High School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Williamson County, IL public schools have an average math proficiency score of 22% (versus the Illinois public school average of 26%), and reading proficiency score of 36% (versus the 30% statewide average). Schools in Williamson County have an average ranking of 8/10, which is in the top 30% of Illinois public schools.

Minority enrollment is 19% of the student body (majority Black), which is less than the Illinois public school average of 55% (majority Hispanic).