Enrollment
262
High
DISTRICT 200 · STATE 668
SCHOOL COMMUNITY·THOUSAND ISLANDS CENTRAL SCHOOL DISTRICT·NCES 360765000548
THOUSAND ISLANDS HIGH SCHOOL
8481 COUNTY RT 9, CLAYTON, NY 13624 · (315) 686-5594 · Jefferson County
GRADES 09–12HIGH42-RURALREGULAR SCHOOL262 STUDENTS
A
allk12 Grade
Scored higher than 91% of New York public high schools
- ATest scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- ABeats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
- ·Three-year trend Not available for this school, so the grade uses the other parts.
Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded New York public high schools
Student : Teacher
12.7:1
21 FTE teachers
DISTRICT 11.6:1 · STATE 11.0:1
Free / Reduced Lunch
38%
99 students
DISTRICT 32% · STATE 58%
Community
0
0 members
Enrollment and student:teacher ratio compared against other high schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 9 | 70 | 27% |
| Grade 10 | 67 | 26% |
| Grade 11 | 65 | 25% |
| Grade 12 | 59 | 23% |
| Ungraded | 1 | 0% |
Student demographics
18%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 13% · STATE 72% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
School pathway
Feeds from
Based on grade levels within THOUSAND ISLANDS CENTRAL SCHOOL DISTRICT. Attendance zones can vary; confirm enrollment with the district.
QUIET COMMUNITY
Be the first to start a discussion at THOUSAND ISLANDS HIGH SCHOOL.
START A DISCUSSIONTest scores
NYS Assessments 2024-25 . % Proficient (Level 3 + Level 4)English Language Arts
79.0%
NY avg 58.3% . -16.0pp since 2023
Math
85.0%
NY avg 57.4% . +2.0pp since 2023
What this means: On the NYS Assessments, New York's statewide test, about 79 of every 100 students at this school read and write at grade level and about 85 of 100 do math at grade level. Across all New York schools, those numbers are about 58 and 57. Reading and writing scores are down about 16 points since 2023, while math scores are up about 2 points.
NYS Assessments results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 79.0% | 85.0% |
| 2023-24 | 95.0% | 83.0% |
% Proficient (Level 3 + Level 4), all students and all tested grades.
Source: NYS Assessments. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
OUTPERFORMING
Top 10% of NY schools after controlling for student poverty
Actual proficiency
86.7%
composite math + reading, all grades
Predicted
61.1%
based on NY schools with similar FRL share
Beats by
+25.6pp
above demographic expectation
What this means: About 87% of students here test proficient in math and reading, well above the roughly 61% typical for New York schools with a similar share of low-income students. BeatsExpectations ranks schools against others at the same poverty level, not by raw scores, so a school can post high scores and still fall short of its prediction, or post lower scores and still beat it. This school clears its prediction by about 26 points, placing it in New York's top 10%.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
Schools most like THOUSAND ISLANDS HIGH SCHOOL
THOUSAND ISLANDS HIGH SCHOOL's state test result (86.7% proficient) is higher than 5 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| THOUSAND ISLANDS HIGH SCHOOL this school | 262 | 37.8% | 86.7% |
| SAUQUOIT VALLEY HIGH SCHOOL SAUQUOIT | 280 | 37.1% | 77.3% |
| LETCHWORTH SENIOR HIGH SCHOOL GAINESVILLE | 268 | 38.8% | 78.2% |
| MARION JUNIOR-SENIOR HIGH SCHOOL MARION | 268 | 39.6% | 69.6% |
| GREENE HIGH SCHOOL GREENE | 273 | 35.2% | 78.4% |
| MOUNT MARKHAM SENIOR HIGH SCHOOL WEST WINFIELD | 283 | 39.9% | 76.3% |
Matched among New York high schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.
Where THOUSAND ISLANDS HIGH SCHOOL ranks
Among high schools| Measure | This school | In New York | In Jefferson County |
|---|---|---|---|
| State test proficiency ranked highest first | 86.7% | #108 of 1,135 | #1 of 7 |
| Math proficiency ranked highest first | 85.0% | #89 of 1,109 ▲ 82 | #1 of 7 ▲ 1 |
| Reading proficiency ranked highest first | 79.0% | #439 of 1,135 ▼ 325 | #4 of 7 ▼ 3 |
| Enrollment ranked largest first | 262 | #990 of 1,216 | #6 of 7 |
| Students per teacher ranked fewest first | 12.7:1 | #792 of 1,058 | #4 of 7 |
| Diversity index ranked most diverse first | 18.5% | #896 of 1,070 | #4 of 7 |
| Free and reduced lunch ranked highest share first | 37.8% | #887 of 1,167 | #7 of 7 |
| Enrollment change since 2017-18 ranked steepest decline first | -14.1% | #312 of 743 | N/A |
Ranked against other public high schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
262
+18 (+7%) vs 2020
-20% since 1990-91, when it was 329
Student : Teacher
12.7:1
was 10.2:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 262 | 20.7 | 12.7:1 | 38% (99) |
| 2023-24 | 253 | 19.9 | 12.7:1 | 41% (104) |
| 2022-23 | 247 | 19.9 | 12.4:1 | 47% (115) |
| 2020-21 | 244 | 24 | 10.2:1 | 39% (94) |
| 2017-18 | 305 | 25.4 | 12.0:1 | 43% (131) |
| 2015-16 | 342 | 22 | 15.6:1 | 41% (139) |
| 2010-11 | 348 | 24 | 14.5:1 | 26% (90) |
| 2000-01 | 377 | 32 | 11.8:1 | 24% (91) |
| 1990-91 | 329 | 21 | 15.7:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for THOUSAND ISLANDS HIGH SCHOOL.
About THOUSAND ISLANDS HIGH SCHOOL
THOUSAND ISLANDS HIGH SCHOOL is a very small high school in CLAYTON, New York, one of the schools in THOUSAND ISLANDS CENTRAL SCHOOL DISTRICT. The school covers grades 9 through 12 and reported 262 students in 2024-25. The school is 61% below the average for high schools in New York.
Federal data list 4 schools in THOUSAND ISLANDS CENTRAL SCHOOL DISTRICT, with 799 students enrolled.
THOUSAND ISLANDS HIGH SCHOOL is 90% White by enrollment. The next largest groups are 5% Hispanic and 4% multiracial. Measured by the diversity index, the student body scores 18%.
Based on 20.7 full-time-equivalent teachers, THOUSAND ISLANDS HIGH SCHOOL has a ratio of 12.7:1. The gap from the 11.0:1 average for high schools in New York is 1.6 students per teacher. Eligibility for free or reduced-price lunch stands at 38%. Compared with the 49% average for public schools in Jefferson County, the school's rate is lower.
On the allk12 Grade, THOUSAND ISLANDS HIGH SCHOOL lands at A, ahead of 91% of New York public high schools.
On BeatsExpectations, which compares test results with what a school's student poverty level would predict, THOUSAND ISLANDS HIGH SCHOOL ranks in the top 10% in New York. Its average proficiency rate across its state test results is 86.7%, against a prediction of 61.1%.
In Jefferson County, home to about 115,040 people, median household income comes to about $66,301, the share of adults with a bachelor's degree or higher is 27%, and roughly 10% of residents are in poverty. There are 39 public schools in the county, enrolling about 16,789, THOUSAND ISLANDS HIGH SCHOOL among them.
Measured in a straight line, THOUSAND ISLANDS MIDDLE SCHOOL is less than a tenth of a mile from THOUSAND ISLANDS HIGH SCHOOL. Within ten miles are 4 other public schools. On proficiency, THOUSAND ISLANDS HIGH SCHOOL is ahead of the 61.5% nearby average, ranking 1st of 8.
For locale, NCES codes THOUSAND ISLANDS HIGH SCHOOL as Rural: Distant.
From 2020-21 to 2024-25, enrollment rose from 244 to 262, a 7% rise. The student-to-teacher ratio increased from 10.2:1 in 2020-21 to 12.7:1 in 2024-25.
THOUSAND ISLANDS HIGH SCHOOL has a community page on allk12 for topics such as pickup and drop-off, after-school programs, and teacher feedback. You can also rate the school on this page.
Jefferson County at a glance
View full county profilePopulation
115,040
Census ACS
Median income
$66,301
Household, ACS
Bachelor's+
27%
Adults 25+
Poverty rate
10%
Below federal line
Schools in county
39
16,789 students
Quick facts
Related schools
Other schools in THOUSAND ISLANDS CENTRAL SCHOOL DISTRICT
- GUARDINO ELEMENTARY SCHOOLElementary · 243 students
- THOUSAND ISLANDS MIDDLE SCHOOLMiddle · 185 students
- BASHAW ELEMENTARY SCHOOLElementary · 109 students
Other schools in CLAYTON
- GUARDINO ELEMENTARY SCHOOLElementary · 243 students
- THOUSAND ISLANDS MIDDLE SCHOOLMiddle · 185 students
Nearby schools
- THOUSAND ISLANDS MIDDLE SCHOOL0.0 mi · 185
- GUARDINO ELEMENTARY SCHOOL6.6 mi · 243
- BASHAW ELEMENTARY SCHOOL8.0 mi · 109
- LYME CENTRAL SCHOOL9.4 mi · 335
- LA FARGEVILLE CENTRAL SCHOOL11.6 mi · 448
- DEXTER ELEMENTARY SCHOOL14.9 mi · 300
Frequently asked questions
About THOUSAND ISLANDS HIGH SCHOOLHow large is THOUSAND ISLANDS HIGH SCHOOL?
THOUSAND ISLANDS HIGH SCHOOL enrolls approximately 262 students in grades 09-12.
Is THOUSAND ISLANDS HIGH SCHOOL an elementary, middle, or high school?
THOUSAND ISLANDS HIGH SCHOOL is a high school covering grades 09-12.
How many teachers does THOUSAND ISLANDS HIGH SCHOOL have?
THOUSAND ISLANDS HIGH SCHOOL employs 21 FTE teachers, for a student-to-teacher ratio of 12.7:1.
What is the racial breakdown of students at THOUSAND ISLANDS HIGH SCHOOL?
At THOUSAND ISLANDS HIGH SCHOOL, the student body is approximately 90% White, 5% Hispanic, 1% Asian, 4% Two or more.
Is THOUSAND ISLANDS HIGH SCHOOL public or private?
THOUSAND ISLANDS HIGH SCHOOL is a public K-12 school, overseen by THOUSAND ISLANDS CENTRAL SCHOOL DISTRICT.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.