#1 Largest Private Schools in Yellowstone County, MT
St. Francis Catholic School
Diocesan school · Grades K–8
603 students
Billings, MT
B-Overall grade603 students13 students per teacher
2026 lists
Largest Private Schools in Yellowstone County, MT
The private schools in Yellowstone County, MT with the most students. Top 11 of 11 schools.
#2 Largest Private Schools in Yellowstone County, MT
Billings Christian School
Christian school (nondenominational) · Grades Pre-K–12
443 students
Billings, MT
A+Overall grade443 students8 students per teacher
#3 Largest Private Schools in Yellowstone County, MT
Billings Central Catholic High School
Diocesan school · Grades 3–12
344 students
Billings, MT
A+Overall grade344 students5 students per teacher
#4 Largest Private Schools in Yellowstone County, MT
Trinity Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
219 students
Billings, MT
B-Overall grade219 students21 students per teacher
#5 Largest Private Schools in Yellowstone County, MT
Grace Montessori Academy
Christian (nondenominational) · Montessori · Grades Pre-K–8
91 students
Billings, MT
BOverall grade91 students9 students per teacher
#6 Largest Private Schools in Yellowstone County, MT
Yellowstone Academy
Special education school · Grades 6–12
75 students
Billings, MT
AOverall grade75 students5 students per teacher
#7 Largest Private Schools in Yellowstone County, MT
New Day
Independent school · Grades 5–12
57 students
Billings, MT
B+Overall grade57 students29 students per teacher
#8 Largest Private Schools in Yellowstone County, MT
Sunrise Montessori School
Montessori school · Grades Pre-K–6
51 students
Billings, MT
AOverall grade51 students4 students per teacher
#9 Largest Private Schools in Yellowstone County, MT
New Day School
Alternative school · Grades 6–12
42 students
Billings, MT
B+Overall grade42 students21 students per teacher
#10 Largest Private Schools in Yellowstone County, MT
Mt. Olive Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–7
27 students
Billings, MT
AOverall grade27 students7 students per teacher
#11 Largest Private Schools in Yellowstone County, MT
New Life School of Light
Pentecostal school · Grades Pre-K–8
23 students
Laurel, MT
B+Overall grade23 students8 students per teacher
From official public records, updated October 2026.