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For the 2025-26 school year, there are 3 public schools serving 760 students in Thomaston, CT (there are , serving 142 private students). 84% of all K-12 students in Thomaston, CT are educated in public schools (compared to the CT state average of 88%).

The top ranked public schools in Thomaston, CT are Thomaston Center School, Black Rock School and Thomaston High School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Thomaston, CT public schools have an average math proficiency score of 41% (versus the Connecticut public school average of 42%), and reading proficiency score of 54% (versus the 51% statewide average). Schools in Thomaston have an average ranking of 4/10, which is in the bottom 50% of Connecticut public schools.

Minority enrollment is 18% of the student body (majority Hispanic), which is less than the Connecticut public school average of 54% (majority Hispanic).