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For the 2025-26 school year, there is 1 public school serving 423 students in Stonington, CT (there are , serving 166 private students). 72% of all K-12 students in Stonington, CT are educated in public schools (compared to the CT state average of 88%).

The top-ranked public school in Stonington, CT is Deans Mill School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Stonington, CT public school have an average math proficiency score of 79% (versus the Connecticut public school average of 42%), and reading proficiency score of 81% (versus the 51% statewide average). Schools in Stonington have an average ranking of 10/10, which is in the top 5% of Connecticut public schools.

Minority enrollment is 13% of the student body (majority Hispanic), which is less than the Connecticut public school average of 54% (majority Hispanic).