#1 Fastest-Growing Private Schools in Dupage County, IL
Naperville Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 168% in about a decade
Naperville, IL
A+Overall grade126 students6 students per teacher
2026 lists
Fastest-Growing Private Schools in Dupage County, IL
Private schools in Dupage County, IL whose enrollment has grown the most over the past decade. Top 10 of 10 schools.
#2 Fastest-Growing Private Schools in Dupage County, IL
Wheaton Montessori School
Montessori school · Grades Pre-K–9
Enrollment up 102% in about a decade
Wheaton, IL
B+Overall grade119 students12 students per teacher
#3 Fastest-Growing Private Schools in Dupage County, IL
Lutheran School of St. Luke
Lutheran (Missouri Synod) school · Grades Pre-K–8
Enrollment up 88% in about a decade
Itasca, IL
B+Overall grade75 students10 students per teacher
#4 Fastest-Growing Private Schools in Dupage County, IL
Timothy Christian Schools
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 78% in about a decade
Elmhurst, IL
B+Overall grade1,194 students18 students per teacher
#5 Fastest-Growing Private Schools in Dupage County, IL
Clapham School
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 67% in about a decade
Wheaton, IL
AOverall grade145 students6 students per teacher
#6 Fastest-Growing Private Schools in Dupage County, IL
Dupage Montessori School
Montessori school · Grades Pre-K–8
Enrollment up 65% in about a decade
Naperville, IL
B+Overall grade137 students9 students per teacher
#7 Fastest-Growing Private Schools in Dupage County, IL
College Preparatory School of America
Islamic school · Grades Pre-K–12
Enrollment up 53% in about a decade
Lombard, IL
A+Overall grade602 students13 students per teacher
#8 Fastest-Growing Private Schools in Dupage County, IL
Giant Steps Illinois
Special education school · Grades 1–12
Enrollment up 44% in about a decade
Lisle, IL
A+Overall grade154 students7 students per teacher
#9 Fastest-Growing Private Schools in Dupage County, IL
School of Expressive Arts and Learning (SEAL)
Special education school · Grades 2–12
Enrollment up 38% in about a decade
Lombard, IL
B+Overall grade95 students9 students per teacher
#10 Fastest-Growing Private Schools in Dupage County, IL
Wheaton Christian Grammar School
Christian school (nondenominational) · Grades K–8
Enrollment up 21% in about a decade
Winfield, IL
BOverall grade646 students16 students per teacher
From official public records, updated October 2026.