#1 Largest Private Schools in Lake Forest, IL
Lake Forest Academy
Independent school · Grades 9–12
446 students
Lake Forest, IL
A+Overall grade446 students7 students per teacher
2026 lists
Largest Private Schools in Lake Forest, IL
The private schools in Lake Forest, IL with the most students. Top 6 of 6 schools.
#2 Largest Private Schools in Lake Forest, IL
School of St. Mary
Diocesan school · Grades Pre-K–8
336 students
Lake Forest, IL
A+Overall grade336 students11 students per teacher
#3 Largest Private Schools in Lake Forest, IL
Lake Forest Country Day School
Independent school · Grades Pre-K–8
325 students
Lake Forest, IL
A+Overall grade325 students5 students per teacher
#4 Largest Private Schools in Lake Forest, IL
Woodlands Academy of the Sacred Heart
Independent Catholic school · Grades 9–12
120 students
Lake Forest, IL
A+Overall gradeAll girls120 students5 students per teacher
#5 Largest Private Schools in Lake Forest, IL
Montessori School of Lake Forest
Montessori school · Grades Pre-K–8
68 students
Lake Forest, IL
A-Overall grade68 students7 students per teacher
#6 Largest Private Schools in Lake Forest, IL
Fusion Academy LF: Chicago- Lake Forest
Alternative school · Grades 6–12
45 students
Lake Forest, IL
AOverall grade45 students2 students per teacher
From official public records, updated October 2026.