#25 Largest Private Schools in Idaho
Calvary Christian School
Christian school (nondenominational) · Grades Pre-K–8
223 students
Boise, ID
BOverall grade223 students13 students per teacher
2026 lists
Largest Private Schools in Idaho
The private schools in Idaho with the most students. Top 50 of 88 schools.
#26 Largest Private Schools in Idaho
All Saints Catholic School
Diocesan school · Grades Pre-K–8
216 students
Lewiston, ID
B-Overall grade216 students18 students per teacher
#27 Largest Private Schools in Idaho
Classical Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
212 students
Rathdrum, ID
A-Overall grade212 students10 students per teacher
#28 Largest Private Schools in Idaho
Sacred Heart Catholic School
Diocesan school · Grades Pre-K–8
195 students
Boise, ID
BOverall grade195 students15 students per teacher
#29 Largest Private Schools in Idaho
Immaculate Conception Academy
Independent Catholic school · Grades K–12
188 students
Post Falls, ID
BOverall gradeAll boys188 students10 students per teacher
#30 Largest Private Schools in Idaho
Immanuel Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–5
186 students
Twin Falls, ID
B-Overall grade186 students17 students per teacher
#31 Largest Private Schools in Idaho
Calvary Meridian Prep Academy
Christian school (nondenominational) · Grades K–10
185 students
Meridian, ID
BOverall grade185 students15 students per teacher
#32 Largest Private Schools in Idaho
St. Edwards Catholic School
Diocesan school · Grades Pre-K–8
157 students
Twin Falls, ID
BOverall grade157 students
#33 Largest Private Schools in Idaho
Sandpoint Waldorf School
Independent school · Grades Pre-K–8
152 students
Sandpoint, ID
BOverall grade152 students9 students per teacher
#34 Largest Private Schools in Idaho
Lake City Academy
Seventh-day Adventist school · Grades Pre-K–8
140 students
Coeur d'Alene, ID
B-Overall grade140 students15 students per teacher
#35 Largest Private Schools in Idaho
House of the Lord Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
130 students
Oldtown, ID
BOverall grade130 students8 students per teacher
#36 Largest Private Schools in Idaho
Calvary Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
123 students
Emmett, ID
A-Overall grade123 students8 students per teacher
#37 Largest Private Schools in Idaho
Sandpoint Christian School
Christian school (nondenominational) · Grades Pre-K–8
121 students
Ponderay, ID
B-Overall grade121 students17 students per teacher
#38 Largest Private Schools in Idaho
St. Nicholas Catholic School
Diocesan school · Grades Pre-K–6
118 students
Rupert, ID
B+Overall grade118 students17 students per teacher
#39 Largest Private Schools in Idaho
St. Marys School
Diocesan school · Grades Pre-K–8
109 students
Boise, ID
A+Overall grade109 students6 students per teacher
#40 Largest Private Schools in Idaho
Summit Christian Academy
Christian school (nondenominational) · Grades Pre-K–6
107 students
Coeur d'Alene, ID
BOverall grade107 students11 students per teacher
#41 Largest Private Schools in Idaho
Cornerstone Christian School
Christian school (nondenominational) · Grades K–8
107 students
Lewiston, ID
B+Overall grade107 students10 students per teacher
#42 Largest Private Schools in Idaho
Pioneer Montessori School
Montessori school · Grades Pre-K–6
104 students
Ketchum, ID
BOverall grade104 students13 students per teacher
#43 Largest Private Schools in Idaho
Pine Grove Academy
Latter-day Saints school · Grades Pre-K–8
102 students
Post Falls, ID
BOverall grade102 students7 students per teacher
#44 Largest Private Schools in Idaho
The Sage School
Alternative school · Grades 6–12
91 students
Hailey, ID
A-Overall grade91 students7 students per teacher
#45 Largest Private Schools in Idaho
One Stone
Independent school · Grades 9–12
87 students
Boise, ID
BOverall grade87 students36 students per teacher
#46 Largest Private Schools in Idaho
St. Mary's Parish School
Parish school · Grades Pre-K–8
84 students
Moscow, ID
AOverall grade84 students9 students per teacher
#47 Largest Private Schools in Idaho
Gem State Adventist Academy
Seventh-day Adventist school · Grades 9–12
83 students
Caldwell, ID
BOverall grade83 students11 students per teacher
#48 Largest Private Schools in Idaho
Boise State University Trio Upward Bound
Alternative school · Grades 9–11
80 students
Boise, ID
A-Overall grade80 students6 students per teacher
From official public records, updated October 2026.