#1 Private Schools with the Smallest Classes in Illinois
Fusion Academy LF: Chicago- Lake Forest
Alternative school · Grades 6–12
1.8 students per teacher
Lake Forest, IL
AOverall grade45 students2 students per teacher
2026 lists
Private Schools with the Smallest Classes in Illinois
Private schools in Illinois with the fewest students per teacher (not counting preschools and special education schools). Top 50 of 634 schools.
#2 Private Schools with the Smallest Classes in Illinois
Fusion Academy Ob: Chicago- Oak Brook
Alternative school · Grades 6–12
2.2 students per teacher
Oak Brook, IL
AOverall grade43 students2 students per teacher
#3 Private Schools with the Smallest Classes in Illinois
Mooseheart Child City and School
Independent school · Grades K–12
2.7 students per teacher
Mooseheart, IL
AOverall grade85 students3 students per teacher
#4 Private Schools with the Smallest Classes in Illinois
Alcuin Montessori School
Montessori school · Grades Pre-K–8
3 students per teacher
Oak Park, IL
A+Overall grade90 students3 students per teacher
#5 Private Schools with the Smallest Classes in Illinois
Crystal Lake Montessori School
Montessori school · Grades Pre-K–8
3.2 students per teacher
Woodstock, IL
A+Overall grade76 students3 students per teacher
#6 Private Schools with the Smallest Classes in Illinois
Montessori Academy of Chicago
Montessori school · Grades Pre-K–6
3.2 students per teacher
Chicago, IL
A+Overall grade72 students3 students per teacher
#7 Private Schools with the Smallest Classes in Illinois
Gems World Academy Chicago
Independent school · Grades Pre-K–12
3.3 students per teacher
Chicago, IL
A+Overall grade196 students3 students per teacher
#8 Private Schools with the Smallest Classes in Illinois
The Chicago Academy for the Arts
Independent school · Grades 9–12
3.5 students per teacher
Chicago, IL
AOverall grade148 students4 students per teacher
#9 Private Schools with the Smallest Classes in Illinois
Guidepost Montessori at Magnificent Mile
Montessori school · Grades K–6
3.8 students per teacher
Chicago, IL
B+Overall grade150 students4 students per teacher
#10 Private Schools with the Smallest Classes in Illinois
Fasman Yeshiva High School
Jewish day school · Grades 9–12
3.8 students per teacher
Skokie, IL
AOverall gradeAll boys103 students4 students per teacher
#11 Private Schools with the Smallest Classes in Illinois
South Loop Montessori School
Montessori school · Grades Pre-K–2
4 students per teacher
Chicago, IL
AOverall grade40 students4 students per teacher
#12 Private Schools with the Smallest Classes in Illinois
Vine Academy
Independent school · Grades K–12
4.1 students per teacher
Burr Ridge, IL
AOverall grade109 students4 students per teacher
#13 Private Schools with the Smallest Classes in Illinois
St. Bede the Venerable
Diocesan school · Grades 2–8
4.1 students per teacher
Chicago, IL
A+Overall grade56 students4 students per teacher
#14 Private Schools with the Smallest Classes in Illinois
Intercultural Montessori Language School
Montessori school · Grades Pre-K–8
4.2 students per teacher
Chicago, IL
A+Overall grade133 students4 students per teacher
#15 Private Schools with the Smallest Classes in Illinois
Unity Academy of Chicago
Islamic · Montessori · Grades Pre-K–4
4.2 students per teacher
Streamwood, IL
A-Overall grade42 students4 students per teacher
#16 Private Schools with the Smallest Classes in Illinois
Unity Academy of Chicago
Islamic · Montessori · Grades Pre-K–4
4.2 students per teacher
Streamwood, IL
A-Overall grade42 students4 students per teacher
#17 Private Schools with the Smallest Classes in Illinois
Genesis Scholars Academy
Religious school · Grades Pre-K–12
4.4 students per teacher
Chicago, IL
42 students4 students per teacher
#18 Private Schools with the Smallest Classes in Illinois
Chicago City Day School
Independent school · Grades K–8
4.5 students per teacher
Chicago, IL
A+Overall grade130 students5 students per teacher
#19 Private Schools with the Smallest Classes in Illinois
Chicago Futabakai Japanese School
Independent school · Grades Pre-K–9
4.5 students per teacher
Arlington Heights, IL
B+Overall grade111 students5 students per teacher
#20 Private Schools with the Smallest Classes in Illinois
Josephinum Academy of the Sacred Heart
Independent Catholic school · Grades 9–12
4.5 students per teacher
Chicago, IL
A+Overall gradeAll girls90 students5 students per teacher
#21 Private Schools with the Smallest Classes in Illinois
St. John the Baptist Catholic School
Diocesan school · Grades Pre-K–8
4.5 students per teacher
Johnsburg, IL
A+Overall grade54 students5 students per teacher
#22 Private Schools with the Smallest Classes in Illinois
Trinity Academy Classical Christian School
Christian school (nondenominational) · Grades Pre-K–12
4.7 students per teacher
Industry, IL
A-Overall grade91 students5 students per teacher
#23 Private Schools with the Smallest Classes in Illinois
Sacred Heart School
Diocesan school · Grades Pre-K–8
4.7 students per teacher
Winnetka, IL
A+Overall grade90 students5 students per teacher
#24 Private Schools with the Smallest Classes in Illinois
Fusion Academy Lincoln Park
Alternative school · Grades 6–12
4.7 students per teacher
Chicago, IL
AOverall grade57 students5 students per teacher
From official public records, updated October 2026.