For the 2025 school year, there are 31 public elementary schools serving 11,837 students in Jefferson County, NY.
The top ranked public elementary schools in Jefferson County, NY are Thousand Islands Middle School, Black River School and La Fargeville Central School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.
Jefferson County, NY public elementary schools have an average math proficiency score of 45% (versus the New York public elementary school average of 52%), and reading proficiency score of 40% (versus the 48% statewide average). Elementary schools in Jefferson County have an average ranking of 5/10, which is in the bottom 50% of New York public elementary schools.
Minority enrollment is 23% of the student body (majority Hispanic), which is less than the New York public elementary school average of 61% (majority Hispanic).
Best Public Elementary Schools in Jefferson County (2025)
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 | 192 students Student-teacher ratio: 11:1 Minority enrollment: 7%
Rank: #22.
Black River School
(Math: 65-69% | Reading: 50-54%)
Rank:
Rank:
7/
Top 50%10
160 Leray St
Black River, NY 13612
(315) 773-5911
Black River, NY 13612
(315) 773-5911
Gr: PK-4 | 546 students Student-teacher ratio: 12:1 Minority enrollment: 36%
Rank: #33.
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 | 465 students Student-teacher ratio: 11:1 Minority enrollment: 7%
Rank: #44.
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 | 399 students Student-teacher ratio: 11:1 Minority enrollment: 12%
Rank: #55.
Philadelphia Primary School
(Math: 60-79% | Reading: 40-59%)
Rank:
Rank:
7/
Top 50%10
3 Sand St
Philadelphia, NY 13673
(315) 642-3432
Philadelphia, NY 13673
(315) 642-3432
Gr: PK-3 | 121 students Student-teacher ratio: 10:1 Minority enrollment: 18%
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 | 345 students Student-teacher ratio: 12:1 Minority enrollment: 11%
Rank: #77.
Bashaw Elementary School
(Math: 50-59% | Reading: 40-49%)
Rank:
Rank:
5/
Bottom 50%10
410 S Esselstyne
Clayton, NY 13624
(315) 654-2142
Clayton, NY 13624
(315) 654-2142
Gr: PK-5 | 114 students Student-teacher ratio: 13:1 Minority enrollment: 2%
Rank: #88.
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 | 725 students Student-teacher ratio: 10:1 Minority enrollment: 34%
Rank: #99.
Alexandria Central Elementary School
(Math: 50-54% | Reading: 40-44%)
Rank:
Rank:
5/
Bottom 50%10
34 Bolton Ave
Alexandria Bay, NY 13607
(315) 482-9971
Alexandria Bay, NY 13607
(315) 482-9971
Gr: PK-6 | 249 students Student-teacher ratio: 10:1 Minority enrollment: 6%
Rank: #1010.
Theresa Primary School
(Math: 30-39% | Reading: 50-59%)
Rank:
Rank:
5/
Bottom 50%10
125 Bridge St
Theresa, NY 13691
(315) 628-4432
Theresa, NY 13691
(315) 628-4432
Gr: K-3 | 193 students Student-teacher ratio: 11:1 Minority enrollment: 15%
Rank: #1111.
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 | 503 students Student-teacher ratio: 11:1 Minority enrollment: 9%
Rank: #1212.
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 | 930 students Student-teacher ratio: 9:1 Minority enrollment: 29%
Rank: #1313.
Calcium Primary School
(Math: 55-59% | Reading: 25-29%)
Rank:
Rank:
4/
Bottom 50%10
25440 Indian River Dr
Calcium, NY 13616
(315) 629-1100
Calcium, NY 13616
(315) 629-1100
Gr: PK-3 | 540 students Student-teacher ratio: 12:1 Minority enrollment: 45%
Rank: #1414.
Guardino Elementary School
(Math: 50-54% | Reading: 30-34%)
Rank:
Rank:
4/
Bottom 50%10
600 High St
Clayton, NY 13624
(315) 686-5594
Clayton, NY 13624
(315) 686-5594
Gr: PK-5 | 263 students Student-teacher ratio: 11:1 Minority enrollment: 6%
Rank: #1515.
Dexter Elementary School
(Math: 45-49% | Reading: 40-44% )
Rank:
Rank:
4/
Bottom 50%10
415 E Grove St
Dexter, NY 13634
(315) 779-2300
Dexter, NY 13634
(315) 779-2300
Gr: PK-2 | 322 students Student-teacher ratio: 14:1 Minority enrollment: 11%
Rank: #16 - 1716. - 17.
Evans Mills Primary School
(Math: 50-54% | Reading: 25-29%)
Rank:
Rank:
4/
Bottom 50%10
8442 S Main St
Evans Mills, NY 13637
(315) 629-4331
Evans Mills, NY 13637
(315) 629-4331
Gr: PK-3 | 328 students Student-teacher ratio: 10:1 Minority enrollment: 47%
Rank: #16 - 1716. - 17.
Mannsville Manor Elementary School
(Math: 50-54% | Reading: 25-29%)
Rank:
Rank:
4/
Bottom 50%10
423 N Main St
Mannsville, NY 13661
(315) 465-4281
Mannsville, NY 13661
(315) 465-4281
Gr: PK-5 | 330 students Student-teacher ratio: 12:1 Minority enrollment: 7%
Rank: #1818.
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 | 404 students Student-teacher ratio: 12:1 Minority enrollment: 5%
Rank: #1919.
Indian River Intermediate School
(Math: 49% | Reading: 30%)
Rank:
Rank:
4/
Bottom 50%10
32430 Us Rt 11
Philadelphia, NY 13673
(315) 642-0405
Philadelphia, NY 13673
(315) 642-0405
Gr: 4-5 | 539 students Student-teacher ratio: 12:1 Minority enrollment: 40%
Rank: #2020.
Maynard P Wilson Elementary School
(Math: 38% | Reading: 37%)
Rank:
Rank:
3/
Bottom 50%10
13180 Us Rt 11
Adams Center, NY 13606
(315) 583-5418
Adams Center, NY 13606
(315) 583-5418
Gr: PK-5 | 479 students Student-teacher ratio: 12:1 Minority enrollment: 7%
Rank: #2121.
Brownville School
(Math: 39% | Reading: 36%)
Rank:
Rank:
3/
Bottom 50%10
771 Main St
Brownville, NY 13615
(315) 779-2300
Brownville, NY 13615
(315) 779-2300
Gr: 3-6 | 372 students Student-teacher ratio: 13:1 Minority enrollment: 11%
Rank: #2222.
Harold T Wiley School
(Math: 30% | Reading: 39%)
Rank:
Rank:
3/
Bottom 50%10
1351 Washington St
Watertown, NY 13601
(315) 785-3780
Watertown, NY 13601
(315) 785-3780
Gr: 5-6 | 621 students Student-teacher ratio: 15:1 Minority enrollment: 33%
Rank: #23 - 2523. - 25.
Carthage Elementary School
(Math: 35-39% | Reading: 25-29%)
Rank:
Rank:
3/
Bottom 50%10
900 Beaver Ln
Carthage, NY 13619
(315) 493-1570
Carthage, NY 13619
(315) 493-1570
Gr: PK-4 | 404 students Student-teacher ratio: 10:1 Minority enrollment: 23%
Rank: #23 - 2523. - 25.
North Elementary School
(Math: 35-39% | Reading: 25-29%)
Rank:
Rank:
3/
Bottom 50%10
171 E Hoard St
Watertown, NY 13601
(315) 785-3750
Watertown, NY 13601
(315) 785-3750
Gr: K-4 | 440 students Student-teacher ratio: 14:1 Minority enrollment: 35%
Rank: #23 - 2523. - 25.
West Carthage Elementary School
(Math: 35-39% | Reading: 25-29%)
Rank:
Rank:
3/
Bottom 50%10
21568 Cole Rd
Carthage, NY 13619
(315) 493-2400
Carthage, NY 13619
(315) 493-2400
Gr: PK-4 | 390 students Student-teacher ratio: 11:1 Minority enrollment: 21%
Rank: #2626.
Sherman School
(Math: 30-34% | Reading: 30-34%)
Rank:
Rank:
2/
Bottom 50%10
836 Sherman St
Watertown, NY 13601
(315) 785-3760
Watertown, NY 13601
(315) 785-3760
Gr: K-4 | 311 students Student-teacher ratio: 14:1 Minority enrollment: 28%
Rank: #2727.
Antwerp Primary School
(Math: 30-39% | Reading: ≤20%)
Rank:
Rank:
2/
Bottom 50%10
6 Academy St
Antwerp, NY 13608
(315) 659-8386
Antwerp, NY 13608
(315) 659-8386
Gr: PK-3 | 157 students Student-teacher ratio: 10:1 Minority enrollment: 37%
Rank: #28 - 2928. - 29.
Knickerbocker School
(Math: 25-29% | Reading: 20-24%)
Rank:
Rank:
1/
Bottom 50%10
739 Knickerbocker Dr
Watertown, NY 13601
(315) 785-3740
Watertown, NY 13601
(315) 785-3740
Gr: K-4 | 360 students Student-teacher ratio: 13:1 Minority enrollment: 28%
Rank: #28 - 2928. - 29.
Ohio Street School
(Math: 25-29% | Reading: 20-24%)
Rank:
Rank:
1/
Bottom 50%10
1537 Ohio St
Watertown, NY 13601
(315) 785-3755
Watertown, NY 13601
(315) 785-3755
Gr: K-4 | 311 students Student-teacher ratio: 13:1 Minority enrollment: 35%
Rank: #3030.
Starbuck Elementary School
(Math: 20-29% | Reading: 20-29%)
Rank:
Rank:
1/
Bottom 50%10
430 E Hoard St
Watertown, NY 13601
(315) 785-3765
Watertown, NY 13601
(315) 785-3765
Gr: K-4 | 185 students Student-teacher ratio: 12:1 Minority enrollment: 44%
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 | 299 students Student-teacher ratio: 8:1 Minority enrollment: 15%
Jefferson County Public Schools (Closed)
School
Location
Quick Facts
Cape Vincent Correction Facility (Closed 2008)
Alternative School
Rt 12e Box 599
Cape Vincent, NY 13618
(315) 654-4100
Cape Vincent, NY 13618
(315) 654-4100
Gr: Inquire with school | 2 students
6 Institute St
Adams, NY 13605
(315) 232-4841
Adams, NY 13605
(315) 232-4841
Gr: K-6 | 216 students Minority enrollment: 3%
Watertown Correctional Facility (Closed 2008)
Alternative School
Dry Hl
Watertown, NY 13601
(315) 782-7490
Watertown, NY 13601
(315) 782-7490
Gr: Inquire with school
Frequently Asked Questions
What are the top ranked public elementary schools in Jefferson County, NY?
The top ranked public elementary schools in Jefferson County, NY include Thousand Islands Middle School, Black River School and La Fargeville Central School.
How many public elementary schools are located in Jefferson County?
31 public elementary schools are located in Jefferson County.
What is the racial composition of students in Jefferson County?
Jefferson County public elementary schools minority enrollment is 23% of the student body (majority Hispanic), which is less than the New York public elementary schools average of 61% (majority Hispanic).
Which public elementary schools in Jefferson County are often viewed compared to one another?
Popular comparisons of public elementary schools in Jefferson County include: Knickerbocker School vs. Sherman School, Evans Mills Primary School vs. Calcium Primary School, Indian River Middle School vs. Carthage Middle School
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