Very Good
#1401 of 4,742 schools in NY
Top 30% in state
Thousand Islands High School
High School · THOUSAND ISLANDS CENTRAL SCHOOL DISTRICT
PO BOX 1000, Clayton, NY 13624
Enrollment
253
Student-Teacher
13.3:1
Score
7.3
Grades
9th – 12th
Enrollment
253
Student-Teacher
13.3:1
Score
7.3
Grades
9th – 12th
Data vintage
2022-23
Data vintage2022-23
How this school compares
New York schools
#1,401 of 4,742
In Clayton
#1 of 4
public schools
In district
#1 of 4
THOUSAND ISLANDS CENTRAL SCHOOL DISTRICT
Academic performance
9.1 / 10
Excellent
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Thousand Islands High School
High School in Clayton · grades 9th – 12th. Start here, then compare fit against nearby and district options.
Thousand Islands Middle School
0.0 mi away. Use as a geographic alternative in the same move search.
Guardino Elementary School
6.6 mi away. Use as a geographic alternative in the same move search.
About Thousand Islands High School
Thousand Islands High School is a public high school in Clayton, NY, part of THOUSAND ISLANDS CENTRAL SCHOOL DISTRICT. Thousand Islands High School serves approximately 253 students, and covers grades 9th-12th, and has a 13.3:1 student-teacher ratio. Thousand Islands High School has a current MySchoolScout rating of 7.3 out of 10 and ranks #1,401 of 4,742 schools in NY.
Structured state assessment records for Thousand Islands High School show 92% math proficiency (multi-year average, 2009-2021) and 88% reading/ELA proficiency (multi-year average, 2009-2021).
- This school 7.3 · Very Good
- NY avg 7.0
What Parents Should Know
Thousand Islands High School sits in a rural area, which can mean longer drives for some families. Rural schools are often community anchors with smaller classes, but check transportation, after-school options, and access to specialized services before you commit.
Score Breakdown
Full Profile · 4/4 metricsView breakdown
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Thousand Islands High School — Students at Thousand Islands High School score 81% proficient, which is above what's typical for similar communities (expected: 55%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
41.1%
Students qualifying for federal meal assistance
Test Scores NY EDFACTS (2020-21)
Based on 26 test records from NY state assessments. About our data
Proficiency Trend
↓ DecliningAverage proficiency (% at or above grade level) across Math & ELA over time.
* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.
Source: EdFacts (NCES) and state assessment data. Growth score: 7.9/10.
How Thousand Islands High School Compares
See how Thousand Islands High School performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Programs & Offerings
Data as of 2021-22 · Source: CRDC via Urban Institute · Learn more
Location
PO BOX 1000, Clayton, NY 13624
Nearby Alternatives
Families considering Thousand Islands High School may also want to explore other high schools in the area. ALEXANDRIA CENTRAL HIGH SCHOOL (rated 6.2/10, 17.5 miles away, in nearby Alexandria Bay), a more accessible option. Another option is IMMACULATE HEART CENTRAL JR/SR HIGH SCHOOL (rated 6.0/10, 20.9 miles away, in nearby Watertown), a more accessible option. Additionally, GENERAL BROWN JUNIOR-SENIOR HIGH SCHOOL (rated 5.1/10, 15.2 miles away, in nearby Dexter), a more accessible option. For more schools in Clayton, see our Clayton schools guide .
Nearby Schools
20 within 21.6 miNeighborhood Census ACS (2019-2023)
Census data for ZIP 13624 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$79,167
Median Home Value
$224,000
Median Rent
$982/mo
Population
4,438
College Educated
31.4%
Homeownership
65.8%
Avg Commute
27.6 min
Poverty Rate
11.5%
Median Age
46
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| BERNE-KNOX-WESTERLO JUNIOR-SENIOR HIGH SCHOOL Berne, NY | 7.3 |
| BROOKLYN SCHOOL FOR MUSIC & THEATER Brooklyn, NY | 7.3 |
| CINCINNATUS HIGH SCHOOL Cincinnatus, NY | 7.3 |
| DRYDEN HIGH SCHOOL Dryden, NY | 7.3 |
| ELISABETH IRWIN HIGH SCHOOL New York, NY | 7.3 |
| FREDERICK DOUGLASS ACADEMY VII HIGH SCHOOL Brooklyn, NY | 7.3 |
Frequently Asked Questions
Common questions about Thousand Islands High School
What grades does Thousand Islands High School serve?
Thousand Islands High School serves students in grades 9th through 12th.
How many students attend Thousand Islands High School?
Thousand Islands High School has an enrollment of approximately 253 students.
What is the student-teacher ratio at Thousand Islands High School?
The student-teacher ratio at Thousand Islands High School is 13.3:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Thousand Islands High School rank in NY?
Thousand Islands High School ranks #1,401 of 4,742 schools in NY.
What is Thousand Islands High School's MySchoolScout rating?
Thousand Islands High School has a current MySchoolScout rating of 7.3 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
What are the test scores at Thousand Islands High School?
Based on loaded state assessment records, Thousand Islands High School has 92% math proficiency (multi-year average, 2009-2021) and 88% reading/ELA proficiency (multi-year average, 2009-2021).
Is Thousand Islands High School a charter school?
No, Thousand Islands High School is not a charter school. It is a traditional public school operated by the local school district.
Is Thousand Islands High School a Title I school?
No, Thousand Islands High School is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Thousand Islands High School?
41.1% of students at Thousand Islands High School qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
Neighborhood Context
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Quick Facts NCES CCD (SY 2022-23)
- Grades
- 9th – 12th
- Enrollment
- 253
- Student-Teacher Ratio
- 13.3:1
- Teachers (FTE)
- 19
- Free/Reduced Lunch
- 41.1%
- Type
- regular
- Setting
- Distant Rural
- County
- Jefferson County
- Chronic Absenteeism (SY 2022-23)
- 30.0%
- Phone
- (315) 686-5594
- 4-Year Graduation
- 95%+
Resources & Links
District
THOUSAND ISLANDS CENTRAL SCHOOL DISTRICT- District Enrollment
- 841
- Schools in District
- 4
- Per-Pupil Spending
- $23,443
- District Rank
- #1 of 4
Other Schools in This District
How we rate schools
A clear 1–10 score built from public data — growth, academics, and learning environment. No hidden criteria, no pay-to-play.
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