Thousand Islands High School
Public
High Grades 9–12 A-School Grade
Part of Thousand Islands Central School District
8481 County Rt 9, Clayton, NY 13624 · (315) 686-5594
Community ratings
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Academic performance
Math proficiency92%
State average 56.1%
Reading / language arts69.5%
State average 62.6%
EDFacts via Urban Institute Education Data Portal (SY2020-21)
At a glance
262Students enrolled
13:1Student–teacher ratio
38%Free / reduced lunch
RuralSetting
Regular SchoolSchool type
Enrollment by grade
Grade 970
Grade 1067
Grade 1165
Grade 1259
Ungraded1
Students
White · 90%236
Hispanic · 5%12
Two or more races · 4%11
Asian · 1%2
American Indian/Alaska Native · 0%1
Counts as reported to NCES; percentages are of students with a reported race/ethnicity.
Enrollment · last 5 years
244’20
255’21
247’22
253’23
262’24
Location
8481 County Rt 9 Clayton
Neighbor reviews
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School facts from the U.S. Department of Education (NCES), 2024-2025 school year. Academic scores from the EDFacts via Urban Institute Education Data Portal (SY2020-21). Community ratings and reviews reflect neighbor opinions, not an official measure of school quality.