#1 Most Diverse Private Schools in Lower Connecticut River Valley County, CT
St. John Paul II School
Diocesan school · Grades Pre-K–8
Largest group: 64% of students
Middletown, CT
AOverall grade199 students12 students per teacher
2026 lists
Most Diverse Private Schools in Lower Connecticut River Valley County, CT
Private schools in Lower Connecticut River Valley County, CT with the most varied mix of students. Top 6 of 6 schools.
#2 Most Diverse Private Schools in Lower Connecticut River Valley County, CT
Mercy High School
Diocesan school · Grades 9–12
Largest group: 72% of students
Middletown, CT
AOverall gradeAll girls384 students12 students per teacher
#3 Most Diverse Private Schools in Lower Connecticut River Valley County, CT
The Independent Day School
Independent school · Grades Pre-K–8
Largest group: 72% of students
Middlefield, CT
AOverall grade89 students5 students per teacher
#4 Most Diverse Private Schools in Lower Connecticut River Valley County, CT
St. John School
Parish school · Grades Pre-K–7
Largest group: 89% of students
Old Saybrook, CT
A+Overall grade55 students3 students per teacher
#5 Most Diverse Private Schools in Lower Connecticut River Valley County, CT
Franklin Academy
Special education school · Grades 8–12
Largest group: 92% of students
East Haddam, CT
BOverall grade77 students4 students per teacher
#6 Most Diverse Private Schools in Lower Connecticut River Valley County, CT
Yeshiva Gedolah of Waterbury- Mesivta Durham
Religious school · Grades 9–12
Largest group: 100% of students
Durham, CT
B-Overall gradeAll boys147 students23 students per teacher
From official public records, updated October 2026.