#1 Private Schools with the Smallest Classes in Dupage County, IL
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
2026 lists
Private Schools with the Smallest Classes in Dupage County, IL
Private schools in Dupage County, IL with the fewest students per teacher (not counting preschools and special education schools). Top 48 of 48 schools.
#2 Private Schools with the Smallest Classes in Dupage County, IL
The Waldorf School of Dupage
Independent school · Grades Pre-K–8
5.4 students per teacher
Warrenville, IL
A+Overall grade76 students5 students per teacher
#3 Private Schools with the Smallest Classes in Dupage County, IL
Clapham School
Christian school (nondenominational) · Grades Pre-K–12
5.8 students per teacher
Wheaton, IL
AOverall grade145 students6 students per teacher
#4 Private Schools with the Smallest Classes in Dupage County, IL
Trinity Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
5.9 students per teacher
Lombard, IL
AOverall grade41 students6 students per teacher
#5 Private Schools with the Smallest Classes in Dupage County, IL
Naperville Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
6.2 students per teacher
Naperville, IL
A+Overall grade126 students6 students per teacher
#6 Private Schools with the Smallest Classes in Dupage County, IL
Avery Coonley School
Independent school · Grades Pre-K–8
7.4 students per teacher
Downers Grove, IL
AOverall grade290 students7 students per teacher
#7 Private Schools with the Smallest Classes in Dupage County, IL
St. Walter School
Parish school · Grades Pre-K–8
7.6 students per teacher
Roselle, IL
A+Overall grade341 students8 students per teacher
#8 Private Schools with the Smallest Classes in Dupage County, IL
St. Matthew School
Diocesan school · Grades Pre-K–8
7.6 students per teacher
Glendale Heights, IL
A+Overall grade75 students8 students per teacher
#9 Private Schools with the Smallest Classes in Dupage County, IL
Seton Montessori School
Montessori school · Grades Pre-K–5
7.6 students per teacher
Clarendon Hills, IL
A-Overall grade50 students8 students per teacher
#10 Private Schools with the Smallest Classes in Dupage County, IL
Prairie School of Dupage
Independent school · Grades Pre-K–8
7.8 students per teacher
Wheaton, IL
B+Overall grade73 students8 students per teacher
#11 Private Schools with the Smallest Classes in Dupage County, IL
Dupage Montessori School
Montessori school · Grades Pre-K–8
9.1 students per teacher
Naperville, IL
B+Overall grade137 students9 students per teacher
#12 Private Schools with the Smallest Classes in Dupage County, IL
Ic Catholic Prep
Diocesan school · Grades 9–12
9.3 students per teacher
Elmhurst, IL
A+Overall grade371 students9 students per teacher
#13 Private Schools with the Smallest Classes in Dupage County, IL
Holy Trinity School
Parish school · Grades Pre-K–8
9.3 students per teacher
Westmont, IL
A+Overall grade117 students9 students per teacher
#14 Private Schools with the Smallest Classes in Dupage County, IL
Kingswood Academy
Independent Catholic school · Grades Pre-K–8
9.7 students per teacher
Darien, IL
A+Overall grade127 students10 students per teacher
#15 Private Schools with the Smallest Classes in Dupage County, IL
Calvary Christian School
Christian school (nondenominational) · Grades Pre-K–8
9.9 students per teacher
Naperville, IL
AOverall grade257 students10 students per teacher
#16 Private Schools with the Smallest Classes in Dupage County, IL
St. John's Lutheran School
Lutheran (Missouri Synod) school · Grades K–8
10 students per teacher
Lombard, IL
BOverall grade158 students10 students per teacher
#17 Private Schools with the Smallest Classes in Dupage County, IL
Lutheran School of St. Luke
Lutheran (Missouri Synod) school · Grades Pre-K–8
10 students per teacher
Itasca, IL
B+Overall grade75 students10 students per teacher
#18 Private Schools with the Smallest Classes in Dupage County, IL
Notre Dame School
Diocesan school · Grades Pre-K–8
10.1 students per teacher
Clarendon Hills, IL
A+Overall grade158 students10 students per teacher
#19 Private Schools with the Smallest Classes in Dupage County, IL
Covenant Classical School
Christian school (nondenominational) · Grades K–8
10.1 students per teacher
Naperville, IL
B+Overall grade109 students10 students per teacher
#20 Private Schools with the Smallest Classes in Dupage County, IL
Immanuel Lutheran
Lutheran (Missouri Synod) school · Grades Pre-K–8
10.1 students per teacher
Elmhurst, IL
B+Overall grade75 students10 students per teacher
#21 Private Schools with the Smallest Classes in Dupage County, IL
Trinity Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
10.2 students per teacher
Roselle, IL
B+Overall grade139 students10 students per teacher
#22 Private Schools with the Smallest Classes in Dupage County, IL
Carriers of Light
Islamic school · Grades Pre-K–6
10.8 students per teacher
Wheaton, IL
B+Overall grade108 students11 students per teacher
#23 Private Schools with the Smallest Classes in Dupage County, IL
Icn Noor Academy
Islamic school · Grades Pre-K–5
11.1 students per teacher
Naperville, IL
AOverall grade112 students11 students per teacher
#24 Private Schools with the Smallest Classes in Dupage County, IL
St. Alphonsus/St Patrick School
Diocesan school · Grades Pre-K–8
11.3 students per teacher
Lemont, IL
B+Overall grade153 students11 students per teacher
From official public records, updated October 2026.