For the 2026 school year, there is 1 private school serving 81 students in Lewis County, NY (there are 13 public schools, serving 4,161 public students). 2% of all K-12 students in Lewis County, NY are educated in private schools (compared to the NY state average of 14%).
100% of private schools in Lewis County, NY are religiously affiliated (most commonly Mennonite).
Private Schools in Lewis County (2026)
School
Location
Quick Facts
River Valley Mennonite School
Alternative School (Mennonite)
5473 State Route 410
Castorland, NY 13620
(315) 493-0187
Castorland, NY 13620
(315) 493-0187
Gr: K-12 | 81 students Avg. class size: 7 students Sports: 4 | Extracurrculars: 2 Tuition listed
Lewis County Private Schools (Closed)
School
Location
Quick Facts
16568 County Route 161
Watertown, NY 13601
Watertown, NY 13601
Gr: 1-8 | 17 students
Crystal Light Mennonite School (Closed 2015)
(Mennonite)
9607 Highland Ave
Castorland, NY 13620
(315) 486-1302
Castorland, NY 13620
(315) 486-1302
Gr: 1-9 | 51 students
Denmark Mennonite School (Closed 2025)
(Mennonite)
10217 St Route 26
Lowville, NY 13367
(315) 212-4224
Lowville, NY 13367
(315) 212-4224
Gr: 1-7 | 8 students
Overview
This County (Lewis County)
This State (NY)
# Schools
1 School
Student Body:
# Students
81 Students
424,936 Students
Academics and Faculty:
# Teachers
11 Teachers
41,601 Teachers
Average Student-Teacher Ratio
7:1
10:1
Average Class Size
7 students
15 students
Tuition and Acceptance Rate:
Average Yearly Tuition Cost
$2,250
$22,391
Students by Ethnicity:
Diversity Score
0.00
0.59
# American Indian Students
n/a
949 Students
% American Indian Students
n/a
n/a
# Asian Students
n/a
18,401 Students
% Asian Students
n/a
5%
# Hispanic Students
n/a
33,760 Students
% Hispanic Students
n/a
8%
# Black Students
n/a
33,699 Students
% Black Students
n/a
8%
# White Students
81 Students
253,643 Students
% White Students
100%
60%
# Hawaiian Students
n/a
538 Students
% Hawaiian Students
n/a
n/a
# Two or more races Students
n/a
n/a
% of Two or more races Students
n/a
n/a
# Others Students
n/a
81,687 Students
% of Others Students
n/a
19%
All Ethnic Groups
Extracurriculars and Sports:
Average Number of Extracurriculars
2 extracurriculars
13 extracurriculars
Average Number of Sports
4 sports
7 sports
Frequently Asked Questions
How many private schools are located in Lewis County, NY?
1 private schools are located in Lewis County, NY.
What percentage of students in Lewis County go to private school?
2% of all K-12 students in Lewis County are educated in private schools (compared to the NY state average of 14%).
What percentage of private schools are religiously affiliated in Lewis County?
100% of private schools in Lewis County are religiously affiliated (most commonly Mennonite).
Recent Articles
How to Stress-Test a Private School Budget Before Enrolling
Learn how to stress-test a private school budget before enrolling and avoid financial surprises that can affect your family's long-term plans.
When “Affordable Private School” Means Fewer Services
Learn what families may sacrifice when choosing an affordable private school and how to evaluate whether lower tuition still delivers long-term value.
Voucher Eligibility Fine Print Parents Miss
Learn the hidden voucher eligibility rules that can affect school choice decisions and how parents can avoid common application mistakes.