#1 Largest Private Schools in Williamson County, TX
Round Rock Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
670 students
Round Rock, TX
B+Overall grade670 students12 students per teacher
2026 lists
Largest Private Schools in Williamson County, TX
The private schools in Williamson County, TX with the most students. Top 17 of 17 schools.
#2 Largest Private Schools in Williamson County, TX
Holy Family Catholic School
Diocesan school · Grades Pre-K–8
587 students
Austin, TX
B+Overall grade587 students23 students per teacher
#3 Largest Private Schools in Williamson County, TX
St. Dominic Savio Catholic High School
Diocesan school · Grades 9–12
414 students
Austin, TX
AOverall grade414 students13 students per teacher
#4 Largest Private Schools in Williamson County, TX
Grace Academy of Georgetown
Christian school (nondenominational) · Grades K–12
353 students
Georgetown, TX
B-Overall grade353 students12 students per teacher
#5 Largest Private Schools in Williamson County, TX
Divine Savior Academy - Santa Rita Ranch
Lutheran (Wisconsin Synod) school · Grades Pre-K–8
260 students
Liberty Hill, TX
BOverall grade260 students8 students per teacher
#6 Largest Private Schools in Williamson County, TX
Zion Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
205 students
Georgetown, TX
BOverall grade205 students10 students per teacher
#7 Largest Private Schools in Williamson County, TX
St. Helen Catholic School
Parish school · Grades Pre-K–8
171 students
Georgetown, TX
B+Overall grade171 students13 students per teacher
#8 Largest Private Schools in Williamson County, TX
Community Montessori School
Montessori school · Grades Pre-K–8
118 students
Georgetown, TX
B+Overall grade118 students30 students per teacher
#9 Largest Private Schools in Williamson County, TX
Sapientia Montessori School
Montessori school · Grades Pre-K–5
68 students
Cedar Park, TX
AOverall grade68 students6 students per teacher
#10 Largest Private Schools in Williamson County, TX
Lake Travis STEM Academy
Independent school · Grades 1–12
40 students
Cedar Park, TX
AOverall grade40 students5 students per teacher
#11 Largest Private Schools in Williamson County, TX
Cedar Park Montessori School
Montessori school · Grades Pre-K–6
39 students
Cedar Park, TX
AOverall grade39 students5 students per teacher
#12 Largest Private Schools in Williamson County, TX
Harbor Leadership Academy
Special education school · Grades 4–12
39 students
Leander, TX
B+Overall grade39 students6 students per teacher
#13 Largest Private Schools in Williamson County, TX
Lake Travis STEM Academy
Independent school · Grades 1–12
39 students
Cedar Park, TX
AOverall grade39 students5 students per teacher
#14 Largest Private Schools in Williamson County, TX
Lakecreek Montessori International School
Montessori school · Grades Pre-K–5
37 students
Austin, TX
AOverall grade37 students3 students per teacher
#15 Largest Private Schools in Williamson County, TX
Kingdom Heights Christian School
Christian school (nondenominational) · Grades Pre-K–7
28 students
Round Rock, TX
A-Overall grade28 students7 students per teacher
#16 Largest Private Schools in Williamson County, TX
Casa De Ninos Bilingual Montessori School
Montessori school · Grades Pre-K–1
22 students
Austin, TX
AOverall grade22 students2 students per teacher
#17 Largest Private Schools in Williamson County, TX
Abacus School of Austin
Early childhood program · Grades Pre-K–K
20 students
Austin, TX
B+Overall grade20 students10 students per teacher
From official public records, updated October 2026.