For the 2026 school year, there are 12 public middle schools serving 5,731 students in Jefferson County, NY.
The top-ranked public middle schools in Jefferson County, NY are Thousand Islands Middle School, General Brown Junior-senior High School and Alexandria Central High School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.
Jefferson County, NY public middle schools have an average math proficiency score of 51% (versus the New York public middle school average of 51%), and reading proficiency score of 46% (versus the 51% statewide average). Middle schools in Jefferson County have an average ranking of 7/10, which is in the top 50% of New York public middle schools.
Minority enrollment is 18% of the student body (majority Hispanic), which is less than the New York public middle school average of 64% (majority Hispanic).
Best Public Middle Schools in Jefferson County (2026)
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Quick Facts
Rank: #11.
Thousand Islands Middle School
(Math: 75-79% | Reading: 64%)
Rank:
Rank:
9/
Top 20%10
8487 County Rt 9
Clayton, NY 13624
(315) 686-5594
Clayton, NY 13624
(315) 686-5594
Gr: 6-8 | 185 students Student-teacher ratio: 12:1 Minority enrollment: 6%
Rank: #22.
General Brown Junior-senior High School
(Math: 75-79% | Reading: 55%)
Rank:
Rank:
8/
Top 30%10
17643 Cemetery Rd
Dexter, NY 13634
(315) 779-2300
Dexter, NY 13634
(315) 779-2300
Gr: 7-12 | 675 students Student-teacher ratio: 15:1 Minority enrollment: 9%
Rank: #33.
Alexandria Central High School
(Math: 50-54% | Reading: 65-69%)
Rank:
Rank:
7/
Top 50%10
34 Bolton Ave
Alexandria Bay, NY 13607
(315) 482-5113
Alexandria Bay, NY 13607
(315) 482-5113
Gr: 7-12 | 224 students Student-teacher ratio: 9:1 Minority enrollment: 6%
Rank: #44.
La Fargeville Central School
(Math: 60% | Reading: 57%)
Rank:
Rank:
7/
Top 50%10
20414 Sunrise Ave
La Fargeville, NY 13656
(315) 658-2241
La Fargeville, NY 13656
(315) 658-2241
Gr: PK-12 | 448 students Student-teacher ratio: 11:1 Minority enrollment: 7%
Rank: #55.
Sackets Harbor Central School
(Math: 66% | Reading: 50-54%)
Rank:
Rank:
7/
Top 50%10
215 S Broad St
Sackets Harbor, NY 13685
(315) 646-3575
Sackets Harbor, NY 13685
(315) 646-3575
Gr: PK-12 | 411 students Student-teacher ratio: 11:1 Minority enrollment: 13%
Rank: #66.
Lyme Central School
(Math: 50-54% | Reading: 50-54%)
Rank:
Rank:
6/
Top 50%10
11868 Academy St
Chaumont, NY 13622
(315) 649-2417
Chaumont, NY 13622
(315) 649-2417
Gr: PK-12 | 335 students Student-teacher ratio: 11:1 Minority enrollment: 11%
Rank: #77.
Indian River Middle School
(Math: 50% | Reading: 47%)
Rank:
Rank:
5/
Bottom 50%10
32735 County Rt 29
Philadelphia, NY 13673
(315) 642-0125
Philadelphia, NY 13673
(315) 642-0125
Gr: 6-8 | 730 students Student-teacher ratio: 10:1 Minority enrollment: 36%
Rank: #88.
Belleville Henderson Central School
(Math: 43% | Reading: 44%)
Rank:
Rank:
5/
Bottom 50%10
8372 County Rt 75
Adams, NY 13605
(315) 846-5121
Adams, NY 13605
(315) 846-5121
Gr: PK-12 | 491 students Student-teacher ratio: 12:1 Minority enrollment: 7%
Rank: #99.
Carthage Middle School
(Math: 44% | Reading: 42%)
Rank:
Rank:
4/
Bottom 50%10
21986 Cole Rd
Carthage, NY 13619
(315) 493-5020
Carthage, NY 13619
(315) 493-5020
Gr: 5-8 | 925 students Student-teacher ratio: 10:1 Minority enrollment: 27%
Rank: #1010.
Clarke Middle School
(Math: 41% | Reading: 41%)
Rank:
Rank:
4/
Bottom 50%10
11060 Us Rt 11
Adams, NY 13605
(315) 232-4531
Adams, NY 13605
(315) 232-4531
Gr: 6-8 | 399 students Student-teacher ratio: 11:1 Minority enrollment: 5%
Rank: #1111.
Case Middle School
(Math: 41% | Reading: 35%)
Rank:
Rank:
3/
Bottom 50%10
1237 Washington St
Watertown, NY 13601
(315) 785-3870
Watertown, NY 13601
(315) 785-3870
Gr: 7-8 | 586 students Student-teacher ratio: 11:1 Minority enrollment: 33%
Rank: n/an/a
Jefferson-lewis-hamilton-herkimer-oneida Boces
Special Education School
20104 State Rte 3
Watertown, NY 13601
(315) 779-7010
Watertown, NY 13601
(315) 779-7010
Gr: K-12 | 267 students Student-teacher ratio: 3:1 Minority enrollment: 16%
Frequently Asked Questions
What are the top-ranked public middle schools in Jefferson County, NY?
The top-ranked public middle schools in Jefferson County, NY include Thousand Islands Middle School, General Brown Junior-senior High School and Alexandria Central High School.
How many public middle schools are located in Jefferson County?
12 public middle schools are located in Jefferson County.
What is the racial composition of students in Jefferson County?
Jefferson County public middle schools minority enrollment is 18% of the student body (majority Hispanic), which is less than the New York public middle schools average of 64% (majority Hispanic).
Which public middle schools in Jefferson County are often viewed compared to one another?
Popular comparisons of public middle schools in Jefferson County include: Lyme Central School vs. Sackets Harbor Central School, Indian River Middle School vs. Carthage Middle School, Carthage Middle School vs. Indian River Middle School
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