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2026 lists

Largest Private Schools in Boise, ID

The private schools in Boise, ID with the most students. Top 12 of 12 schools.

#1 Largest Private Schools in Boise, ID

Bishop Kelly High School

Diocesan school · Grades 9–12

967 students

Boise, ID

BOverall grade967 students16 students per teacher

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#4 Largest Private Schools in Boise, ID

St. Marks Elementary School

Parish school · Grades Pre-K–8

323 students

Boise, ID

AOverall grade323 students14 students per teacher

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#5 Largest Private Schools in Boise, ID

Calvary Christian School

Christian school (nondenominational) · Grades Pre-K–8

223 students

Boise, ID

BOverall grade223 students13 students per teacher

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#6 Largest Private Schools in Boise, ID

Sacred Heart Catholic School

Diocesan school · Grades Pre-K–8

195 students

Boise, ID

BOverall grade195 students15 students per teacher

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#7 Largest Private Schools in Boise, ID

St. Marys School

Diocesan school · Grades Pre-K–8

109 students

Boise, ID

A+Overall grade109 students6 students per teacher

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#8 Largest Private Schools in Boise, ID

One Stone

Independent school · Grades 9–12

87 students

Boise, ID

BOverall grade87 students36 students per teacher

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#10 Largest Private Schools in Boise, ID

Boise Valley Adventist School

Seventh-day Adventist school · Grades Pre-K–8

75 students

Boise, ID

BOverall grade75 students13 students per teacher

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#11 Largest Private Schools in Boise, ID

Kidz Connection Montessori

Montessori school · Grades Pre-K–5

30 students

Boise, ID

AOverall grade30 students2 students per teacher

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#12 Largest Private Schools in Boise, ID

Rose Hill Montessori School

Montessori school · Grades Pre-K–6

22 students

Boise, ID

A-Overall grade22 students9 students per teacher

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From official public records, updated October 2026.

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