#1 Fastest-Growing Private Schools in Montgomery County, MD
The Siena School
Special education school · Grades 4–12
Enrollment up 91% in about a decade
Silver Spring, MD
AOverall grade143 students5 students per teacher
2026 lists
Fastest-Growing Private Schools in Montgomery County, MD
Private schools in Montgomery County, MD whose enrollment has grown the most over the past decade. Top 24 of 24 schools.
#2 Fastest-Growing Private Schools in Montgomery County, MD
The Diener School
Special education school · Grades K–8
Enrollment up 83% in about a decade
North Bethesda, MD
A+Overall grade75 students3 students per teacher
#3 Fastest-Growing Private Schools in Montgomery County, MD
Yeshiva of Greater Washington Boys Division
Jewish day school · Grades 7–12
Enrollment up 73% in about a decade
Silver Spring, MD
B-Overall gradeAll boys157 students12 students per teacher
#4 Fastest-Growing Private Schools in Montgomery County, MD
Bullis School
Independent school · Grades K–12
Enrollment up 58% in about a decade
Potomac, MD
A+Overall grade1,027 students9 students per teacher
#5 Fastest-Growing Private Schools in Montgomery County, MD
Covenant Life School
Christian school (nondenominational) · Grades Pre-K–12
Enrollment up 52% in about a decade
Gaithersburg, MD
B+Overall grade444 students11 students per teacher
#6 Fastest-Growing Private Schools in Montgomery County, MD
Butler Montessori
Montessori school · Grades Pre-K–9
Enrollment up 35% in about a decade
Darnestown, MD
B+Overall grade146 students15 students per teacher
#7 Fastest-Growing Private Schools in Montgomery County, MD
Mater Amoris Montessori School
Montessori school · Grades Pre-K–8
Enrollment up 31% in about a decade
Ashton, MD
B+Overall grade97 students10 students per teacher
#8 Fastest-Growing Private Schools in Montgomery County, MD
The Nora School
Independent school · Grades 9–12
Enrollment up 31% in about a decade
Silver Spring, MD
BOverall grade76 students6 students per teacher
#9 Fastest-Growing Private Schools in Montgomery County, MD
Mother of God School
Independent Catholic school · Grades Pre-K–8
Enrollment up 29% in about a decade
Gaithersburg, MD
A+Overall grade198 students13 students per teacher
#10 Fastest-Growing Private Schools in Montgomery County, MD
St. Raphael School
Diocesan school · Grades Pre-K–8
Enrollment up 27% in about a decade
Rockville, MD
A+Overall grade224 students10 students per teacher
#11 Fastest-Growing Private Schools in Montgomery County, MD
St. Andrew's Episcopal School
Episcopal school · Grades Pre-K–12
Enrollment up 25% in about a decade
Potomac, MD
A+Overall grade673 students7 students per teacher
#12 Fastest-Growing Private Schools in Montgomery County, MD
MC Lean School of Maryland
Independent school · Grades K–12
Enrollment up 25% in about a decade
Potomac, MD
A+Overall grade469 students6 students per teacher
#13 Fastest-Growing Private Schools in Montgomery County, MD
Rochambeau-The French Intl School
Independent school · Grades Pre-K–12
Enrollment up 22% in about a decade
Bethesda, MD
AOverall grade1,085 students10 students per teacher
#14 Fastest-Growing Private Schools in Montgomery County, MD
Sandy Springs Friends Middle School
Quaker (Friends) school · Grades Pre-K–12
Enrollment up 21% in about a decade
Sandy Spring, MD
A+Overall grade679 students8 students per teacher
#15 Fastest-Growing Private Schools in Montgomery County, MD
Spencerville Adventist Academy
Seventh-day Adventist school · Grades Pre-K–12
Enrollment up 21% in about a decade
Spencerville, MD
AOverall grade399 students14 students per teacher
#16 Fastest-Growing Private Schools in Montgomery County, MD
Don Bosco Cristo Rey High School
Diocesan school · Grades 9–12
Enrollment up 21% in about a decade
Takoma Park, MD
B-Overall grade383 students17 students per teacher
#17 Fastest-Growing Private Schools in Montgomery County, MD
Washington Waldorf School
Independent school · Grades Pre-K–12
Enrollment up 21% in about a decade
Bethesda, MD
A+Overall grade249 students3 students per teacher
#18 Fastest-Growing Private Schools in Montgomery County, MD
St. Andrew Apostle School
Parish school · Grades Pre-K–8
Enrollment up 20% in about a decade
Silver Spring, MD
A+Overall grade306 students12 students per teacher
#19 Fastest-Growing Private Schools in Montgomery County, MD
Avalon School
Independent Catholic school · Grades K–12
Enrollment up 18% in about a decade
Silver Spring, MD
A+Overall gradeAll boys202 students8 students per teacher
#20 Fastest-Growing Private Schools in Montgomery County, MD
Stone Ridge School of the Sacred Heart
Independent Catholic school · Grades Pre-K–12
Enrollment up 15% in about a decade
Bethesda, MD
A+Overall gradeAll girls738 students6 students per teacher
#21 Fastest-Growing Private Schools in Montgomery County, MD
Connelly School of the Holy Child
Religious school · Grades 6–12
Enrollment up 15% in about a decade
Potomac, MD
A+Overall gradeAll girls350 students7 students per teacher
#22 Fastest-Growing Private Schools in Montgomery County, MD
St. Peter's School
Parish school · Grades Pre-K–8
Enrollment up 14% in about a decade
Olney, MD
A+Overall grade431 students10 students per teacher
#23 Fastest-Growing Private Schools in Montgomery County, MD
Barrie School
Montessori school · Grades Pre-K–12
Enrollment up 12% in about a decade
Silver Spring, MD
A+Overall grade252 students4 students per teacher
#24 Fastest-Growing Private Schools in Montgomery County, MD
Torah School of Greater Washington
Jewish day school · Grades K–6
Enrollment up 10% in about a decade
Silver Spring, MD
BOverall grade333 students10 students per teacher
From official public records, updated October 2026.