Thousand Islands High School
🇺🇸 Official data · 2025Clayton, New York 13624 · Thousand Islands Central School District
#286 of 1,079 high schools in New York
#691 of 16,910 nationally
About Thousand Islands High School
Thousand Islands High School is a public high located in Clayton, in the Thousand Islands Central School District school district of New York, United States. It caters for Grades 9–12. In 2025 it enrolled 262 students. Traditional public schools run by a school district; free to attend.
Its Success Index (US) is 84.5 out of 100, placing it in the top 5% of high schools in United States and 286th of 1,079 ranked high schools in New York. Its strongest component is math proficiency (96th percentile), and its weakest is students per teacher (63th percentile).
Other published figures: enrollment 262.
There are 3 schools in Clayton; Thousand Islands High School ranks 1st of 3 scored schools there.
Success Index (US) breakdown
Each component is a percentile against high schools across United States.
- Math proficiency (30%)92%
- Reading proficiency (30%)92%
- Community advantage (fewer free/reduced-price lunch) (25%)37.8%
- Students per teacher (15%)13.1
The Success Index (US) summarises published data about a school community. It is not a measure of teaching quality. Read the methodology.
Published measures
All figures published for Thousand Islands High School by the official sources.
- Enrollment
- 262
- Students enrolled in the latest NCES directory year.
- Free/reduced-price lunch
- 37.8%
- Share of students eligible for free or reduced-price lunch.
- Students per teacher
- 13.1
- Enrollment divided by FTE teachers; not class size.
- Reading proficiency
- 92%
- Share of tested students proficient or above (all students, all grades).
- Math proficiency
- 92%
- Share of tested students proficient or above (all students, all grades).
Free academic assessment
Is your child on grade level in reading and math?
Success Tutoring offers personalised English and math tutoring from Kindergarten to Grade 12. Start with a free online assessment and a clear plan for the year ahead.
- Personalised learning plan mapped to the Australian Curriculum
- English & Maths from Kindergarten to Year 12
- Flexible memberships, no lock-in contracts
- Centres across NSW, VIC, QLD, WA, SA and ACT
Schools near Thousand Islands High School
Closest schools by straight-line distance, with their Success Index (US).
Thousand Islands Middle School
Clayton · Public middle · Grades 6–8
185 students · 0 m away
Guardino Elementary School
Clayton · Public elementary · Grades PK–5
243 students · 11 km away
Bashaw Elementary School
Cape Vincent · Public elementary · Grades PK–5
109 students · 13 km away
Similar schools
Public high schools in New York with a comparable Enrollment.
Lower Manhattan Arts Academy
New York · Public high · Grades 9–12
262 students
It Takes A Village Academy
Brooklyn · Public high · Grades 9–12
262 students
Warrensburg Junior-Senior High School
Warrensburg · Public high · Grades 7–12
262 students
Humanities Preparatory Academy
New York · Public high · Grades 9–12
261 students
Marie Curie High School-Nursing
Bronx · Public high · Grades 9–12
263 students
Red Creek High School
Red Creek · Public high · Grades 9–12
263 students
Frequently asked questions
Is Thousand Islands High School a good school?
Thousand Islands High School has a Success Index (US) of 84.5 out of 100 (Top 5% of high schools in United States) and ranks #286 of 1,079 in New York. The index summarises published data about the school community and, where available, attainment; it does not measure teaching quality, so visit the school and ask about support at your child's level.
Where does Thousand Islands High School rank in New York?
Thousand Islands High School ranks #286 of 1,079 high schools in New York and #691 of 16,910 nationally on the Success Index (US) (2025 data).
How many students attend Thousand Islands High School?
Thousand Islands High School had 262 students in 2025.
Is Thousand Islands High School a elementary school or a high school?
Thousand Islands High School is classified as a high covering Grades 9–12. It is a public school.
What other schools are near Thousand Islands High School?
There are 3 schools within 15 km of Thousand Islands High School; they are listed on this page with their Success Index (US) and distance, and can be compared side by side.