#1 Private Schools with the Smallest Classes in Oak Park, IL
Alcuin Montessori School
Montessori school · Grades Pre-K–8
3 students per teacher
Oak Park, IL
A+Overall grade90 students3 students per teacher
2026 lists
Private Schools with the Smallest Classes in Oak Park, IL
Private schools in Oak Park, IL with the fewest students per teacher (not counting preschools and special education schools). Top 8 of 8 schools.
#2 Private Schools with the Smallest Classes in Oak Park, IL
West Suburban Montessori School
Montessori school · Grades Pre-K–6
8.4 students per teacher
Oak Park, IL
B+Overall grade42 students8 students per teacher
#3 Private Schools with the Smallest Classes in Oak Park, IL
The Childrens School of Oak Park
Alternative school · Grades K–8
10.6 students per teacher
Oak Park, IL
BOverall grade132 students11 students per teacher
#4 Private Schools with the Smallest Classes in Oak Park, IL
St. Giles School
Diocesan school · Grades Pre-K–8
11.7 students per teacher
Oak Park, IL
AOverall grade264 students12 students per teacher
#5 Private Schools with the Smallest Classes in Oak Park, IL
Ascension Elementary School
Diocesan school · Grades Pre-K–8
11.9 students per teacher
Oak Park, IL
AOverall grade322 students12 students per teacher
#6 Private Schools with the Smallest Classes in Oak Park, IL
Fenwick High School
Parish school · Grades 9–12
12.4 students per teacher
Oak Park, IL
A+Overall grade1,024 students12 students per teacher
#7 Private Schools with the Smallest Classes in Oak Park, IL
The Field School
Christian school (nondenominational) · Grades Pre-K–8
14.3 students per teacher
Oak Park, IL
BOverall grade227 students14 students per teacher
#8 Private Schools with the Smallest Classes in Oak Park, IL
St. Catherine Siena-St. Lucy School
Diocesan school · Grades Pre-K–8
15.9 students per teacher
Oak Park, IL
B-Overall grade175 students16 students per teacher
From official public records, updated October 2026.