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For the 2025-26 school year, there are 12 public high schools serving 6,510 students in Jefferson County, NY.

The top ranked public high schools in Jefferson County, NY are Thousand Islands High School, South Jefferson High School and Carthage Senior High School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Jefferson County, NY public high schools have an average math proficiency score of 61% (versus the New York public high school average of 55%), and reading proficiency score of 59% (versus the 59% statewide average). High schools in Jefferson County have an average ranking of 7/10, which is in the top 50% of New York public high schools.

Jefferson County, NY public high school have a Graduation Rate of 86%, which is less than the New York average of 89%.

The school with highest graduation rate is South Jefferson High School, with ≥95% graduation rate. Read more about public school graduation rate statistics in New York or national school graduation rate statistics.

Minority enrollment is 17% of the student body (majority Hispanic), which is less than the New York public high school average of 61% (majority Hispanic).