#1 Most Diverse Private Schools in Dupage County, IL
St. Matthew School
Diocesan school · Grades Pre-K–8
Largest group: 32% of students
Glendale Heights, IL
A+Overall grade75 students8 students per teacher
2026 lists
Most Diverse Private Schools in Dupage County, IL
Private schools in Dupage County, IL with the most varied mix of students. Top 50 of 52 schools.
#2 Most Diverse Private Schools in Dupage County, IL
Marklund Day School
Special education school · Grades K–12
Largest group: 39% of students
Bloomingdale, IL
A-Overall grade66 students4 students per teacher
#3 Most Diverse Private Schools in Dupage County, IL
Calvary Christian School
Christian school (nondenominational) · Grades Pre-K–8
Largest group: 40% of students
Naperville, IL
AOverall grade257 students10 students per teacher
#4 Most Diverse Private Schools in Dupage County, IL
Avery Coonley School
Independent school · Grades Pre-K–8
Largest group: 41% of students
Downers Grove, IL
AOverall grade290 students7 students per teacher
#5 Most Diverse Private Schools in Dupage County, IL
Giant Steps Illinois
Special education school · Grades 1–12
Largest group: 45% of students
Lisle, IL
A+Overall grade154 students7 students per teacher
#6 Most Diverse Private Schools in Dupage County, IL
School of Expressive Arts and Learning (SEAL)
Special education school · Grades 2–12
Largest group: 49% of students
Lombard, IL
B+Overall grade95 students9 students per teacher
#7 Most Diverse Private Schools in Dupage County, IL
Naperville Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
Largest group: 50% of students
Naperville, IL
A+Overall grade126 students6 students per teacher
#8 Most Diverse Private Schools in Dupage County, IL
Seton Montessori School
Montessori school · Grades Pre-K–5
Largest group: 50% of students
Clarendon Hills, IL
A-Overall grade50 students8 students per teacher
#9 Most Diverse Private Schools in Dupage County, IL
St. Isidore School
Diocesan school · Grades Pre-K–8
Largest group: 51% of students
Bloomingdale, IL
B+Overall grade189 students14 students per teacher
#10 Most Diverse Private Schools in Dupage County, IL
Dupage Montessori School
Montessori school · Grades Pre-K–8
Largest group: 53% of students
Naperville, IL
B+Overall grade137 students9 students per teacher
#11 Most Diverse Private Schools in Dupage County, IL
Glenoaks Therapeutic Day Schools
Special education school · Grades 6–12
Largest group: 54% of students
Glendale Heights, IL
B-Overall grade163 students13 students per teacher
#12 Most Diverse Private Schools in Dupage County, IL
St. John the Baptist Catholic School
Diocesan school · Grades Pre-K–8
Largest group: 56% of students
Winfield, IL
B-Overall grade177 students16 students per teacher
#13 Most Diverse Private Schools in Dupage County, IL
Ic Catholic Prep
Diocesan school · Grades 9–12
Largest group: 58% of students
Elmhurst, IL
A+Overall grade371 students9 students per teacher
#14 Most Diverse Private Schools in Dupage County, IL
Wheaton Montessori School
Montessori school · Grades Pre-K–9
Largest group: 61% of students
Wheaton, IL
B+Overall grade119 students12 students per teacher
#15 Most Diverse Private Schools in Dupage County, IL
Little Friends School Programs
Special education school · Grades Pre-K–12
Largest group: 61% of students
Warrenville, IL
BOverall grade114 students8 students per teacher
#16 Most Diverse Private Schools in Dupage County, IL
Clare Woods Academy
Independent Catholic school · Grades K–12
Largest group: 62% of students
Wheaton, IL
AOverall grade88 students7 students per teacher
#17 Most Diverse Private Schools in Dupage County, IL
Marquette Manor Baptist Academy
Baptist school · Grades Pre-K–12
Largest group: 63% of students
Downers Grove, IL
BOverall grade135 students13 students per teacher
#18 Most Diverse Private Schools in Dupage County, IL
All Saints Catholic Academy
Parish school · Grades Pre-K–8
Largest group: 64% of students
Naperville, IL
A-Overall grade414 students14 students per teacher
#19 Most Diverse Private Schools in Dupage County, IL
The Waldorf School of Dupage
Independent school · Grades Pre-K–8
Largest group: 64% of students
Warrenville, IL
A+Overall grade76 students5 students per teacher
#20 Most Diverse Private Schools in Dupage County, IL
Covenant Classical School
Christian school (nondenominational) · Grades K–8
Largest group: 65% of students
Naperville, IL
B+Overall grade109 students10 students per teacher
#21 Most Diverse Private Schools in Dupage County, IL
Islamic Foundation School
Islamic school · Grades Pre-K–12
Largest group: 68% of students
Villa Park, IL
B+Overall grade633 students14 students per teacher
#22 Most Diverse Private Schools in Dupage County, IL
St. Philip the Apostle School
Diocesan school · Grades Pre-K–8
Largest group: 68% of students
Addison, IL
BOverall grade237 students17 students per teacher
#23 Most Diverse Private Schools in Dupage County, IL
Kingswood Academy
Independent Catholic school · Grades Pre-K–8
Largest group: 68% of students
Darien, IL
A+Overall grade127 students10 students per teacher
#24 Most Diverse Private Schools in Dupage County, IL
Icn Noor Academy
Islamic school · Grades Pre-K–5
Largest group: 72% of students
Naperville, IL
AOverall grade112 students11 students per teacher
From official public records, updated October 2026.