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 15%).
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
423,871 Students
Academics and Faculty:
# Teachers
11 Teachers
41,515 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
252,775 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
81,490 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 15%).
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
Executive Function Skills: The Key to Academic Success
Learn why executive function skills are among the strongest predictors of academic success and how parents and schools can strengthen them.
Private School Marketing Strategies for Enrollment Growth
Discover proven private school marketing strategies for 2026, including digital outreach, branding, enrollment management, and parent engagement.
Private School Transportation Options: A 2026 Parent Guide
Explore private school transportation options in 2026, including buses, carpools, transit, and safety considerations for families.