#1 Largest Private Schools in Watertown, WI
Luther Preparatory School
Lutheran (Wisconsin Synod) school · Grades 9–12
409 students
Watertown, WI
AOverall grade409 students9 students per teacher
2026 lists
Largest Private Schools in Watertown, WI
The private schools in Watertown, WI with the most students. Top 10 of 10 schools.
#2 Largest Private Schools in Watertown, WI
St. Marks Evangelical Lutheran School
Lutheran (Wisconsin Synod) school · Grades Pre-K–8
191 students
Watertown, WI
BOverall grade191 students16 students per teacher
#3 Largest Private Schools in Watertown, WI
Calvary Baptist Christian School
Baptist school · Grades Pre-K–8
152 students
Watertown, WI
A+Overall grade152 students11 students per teacher
#4 Largest Private Schools in Watertown, WI
St. John's Lutheran School
Lutheran (Wisconsin Synod) school · Grades Pre-K–8
143 students
Watertown, WI
B+Overall grade143 students13 students per teacher
#5 Largest Private Schools in Watertown, WI
Good Shepherd Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
135 students
Watertown, WI
B+Overall grade135 students15 students per teacher
#6 Largest Private Schools in Watertown, WI
Trinity-St. Lukes Lutheran Elementary School
Lutheran (Wisconsin Synod) school · Grades Pre-K–8
123 students
Watertown, WI
AOverall grade123 students10 students per teacher
#7 Largest Private Schools in Watertown, WI
St. Henry Catholic School
Parish school · Grades 1–8
102 students
Watertown, WI
A+Overall grade102 students9 students per teacher
#8 Largest Private Schools in Watertown, WI
Trinity St. Lukes Lutheran Middle School
Lutheran (Wisconsin Synod) school · Grades 3–8
88 students
Watertown, WI
B+Overall grade88 students13 students per teacher
#9 Largest Private Schools in Watertown, WI
Maranatha Baptist Academy
Baptist school · Grades 9–12
65 students
Watertown, WI
A-Overall grade65 students9 students per teacher
#10 Largest Private Schools in Watertown, WI
Lebanon Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
47 students
Watertown, WI
A+Overall grade47 students9 students per teacher
From official public records, updated October 2026.