#1 Fastest-Growing Private Schools in Middlesex County, MA
Wellan Montessori School
Montessori school · Grades Pre-K–8
Enrollment up 153% in about a decade
Newton, MA
A+Overall grade167 students2 students per teacher
2026 lists
Fastest-Growing Private Schools in Middlesex County, MA
Private schools in Middlesex County, MA whose enrollment has grown the most over the past decade. Top 26 of 26 schools.
#2 Fastest-Growing Private Schools in Middlesex County, MA
Veritas Christian Academy
Christian school (nondenominational) · Grades Pre-K–8
Enrollment up 150% in about a decade
Wayland, MA
AOverall grade185 students9 students per teacher
#3 Fastest-Growing Private Schools in Middlesex County, MA
Metrowest Christian Academy
Christian school (nondenominational) · Grades Pre-K–5
Enrollment up 137% in about a decade
Ashland, MA
BOverall grade140 students19 students per teacher
#4 Fastest-Growing Private Schools in Middlesex County, MA
Lowell Catholic
Diocesan school · Grades Pre-K–12
Enrollment up 81% in about a decade
Lowell, MA
B-Overall grade705 students11 students per teacher
#5 Fastest-Growing Private Schools in Middlesex County, MA
Summit Montessori School
Montessori school · Grades Pre-K–6
Enrollment up 76% in about a decade
Framingham, MA
AOverall grade65 students5 students per teacher
#6 Fastest-Growing Private Schools in Middlesex County, MA
New Covenant School
Christian school (nondenominational) · Grades Pre-K–5
Enrollment up 71% in about a decade
Arlington, MA
AOverall grade65 students9 students per teacher
#7 Fastest-Growing Private Schools in Middlesex County, MA
Acera School
Independent school · Grades K–12
Enrollment up 52% in about a decade
Winchester, MA
A+Overall grade122 students5 students per teacher
#8 Fastest-Growing Private Schools in Middlesex County, MA
Mount Hope Christian School
Assembly of God school · Grades Pre-K–6
Enrollment up 51% in about a decade
Burlington, MA
B+Overall grade159 students10 students per teacher
#9 Fastest-Growing Private Schools in Middlesex County, MA
Lesley Ellis School
Independent school · Grades Pre-K–8
Enrollment up 50% in about a decade
Arlington, MA
A+Overall grade155 students4 students per teacher
#10 Fastest-Growing Private Schools in Middlesex County, MA
Malden Catholic High School
Independent Catholic school · Grades 9–12
Enrollment up 47% in about a decade
Malden, MA
A+Overall grade863 students12 students per teacher
#11 Fastest-Growing Private Schools in Middlesex County, MA
Nashoba Learning Group
Special education school · Grades K–12
Enrollment up 47% in about a decade
Bedford, MA
BOverall grade126 students9 students per teacher
#12 Fastest-Growing Private Schools in Middlesex County, MA
Milestones Day School
Special education school · Grades 4–12
Enrollment up 41% in about a decade
Waltham, MA
B+Overall grade89 students5 students per teacher
#13 Fastest-Growing Private Schools in Middlesex County, MA
Immaculate Conception School
Parish school · Grades Pre-K–8
Enrollment up 40% in about a decade
Lowell, MA
BOverall grade303 students15 students per teacher
#14 Fastest-Growing Private Schools in Middlesex County, MA
The Brighton School
Independent school · Grades Pre-K–6
Enrollment up 37% in about a decade
Framingham, MA
AOverall grade56 students7 students per teacher
#15 Fastest-Growing Private Schools in Middlesex County, MA
Belmont Day School
Independent school · Grade 1
Enrollment up 34% in about a decade
Belmont, MA
A+Overall grade334 students4 students per teacher
#16 Fastest-Growing Private Schools in Middlesex County, MA
Our Ladys Academy
Parish school · Grades Pre-K–8
Enrollment up 30% in about a decade
Waltham, MA
A+Overall grade328 students8 students per teacher
#17 Fastest-Growing Private Schools in Middlesex County, MA
Atrium School
Independent school · Grades Pre-K–8
Enrollment up 28% in about a decade
Watertown, MA
A+Overall grade110 students5 students per teacher
#18 Fastest-Growing Private Schools in Middlesex County, MA
The Carroll School
Special education school · Grades 1–9
Enrollment up 23% in about a decade
Lincoln, MA
A+Overall grade455 students3 students per teacher
#19 Fastest-Growing Private Schools in Middlesex County, MA
Greater Boston Academy
Seventh-day Adventist school · Grades Pre-K–8
Enrollment up 23% in about a decade
Stoneham, MA
BOverall grade171 students14 students per teacher
#20 Fastest-Growing Private Schools in Middlesex County, MA
Chapel Hill Chauncy Hall School
Independent school · Grades 8–12
Enrollment up 21% in about a decade
Waltham, MA
A+Overall grade198 students5 students per teacher
#21 Fastest-Growing Private Schools in Middlesex County, MA
Austin Preparatory School
Independent Catholic school · Grades 6–12
Enrollment up 18% in about a decade
Reading, MA
B+Overall grade806 students11 students per teacher
#22 Fastest-Growing Private Schools in Middlesex County, MA
Arlington Catholic High School/Saint Agnes School
Diocesan school · Grades Pre-K–12
Enrollment up 17% in about a decade
Arlington, MA
A-Overall grade851 students10 students per teacher
#23 Fastest-Growing Private Schools in Middlesex County, MA
Cotting School
Special education school · Grades Pre-K–12
Enrollment up 13% in about a decade
Lexington, MA
B+Overall grade120 students5 students per teacher
#24 Fastest-Growing Private Schools in Middlesex County, MA
The Rivers School
Independent school · Grades 6–12
Enrollment up 12% in about a decade
Weston, MA
A+Overall grade525 students6 students per teacher
From official public records, updated October 2026.