#1 Best Catholic Schools in Ada County, ID
St. Marys School
Diocesan school · Grades Pre-K–8
Smaller classes than 92% of Catholic schools in Idaho
Boise, ID
A+Overall grade109 students6 students per teacher
2026 lists
Best Catholic Schools in Ada County, ID
The highest-graded schools of this kind in Ada County, ID. Top 6 of 6 schools.
#2 Best Catholic Schools in Ada County, ID
St. Marks Elementary School
Parish school · Grades Pre-K–8
Serving families in Boise since at least 2011
Boise, ID
AOverall grade323 students14 students per teacher
#3 Best Catholic Schools in Ada County, ID
St. Joseph's Catholic School
Diocesan school · Grades K–8
One of the 3 largest Catholic schools in Idaho
Boise, ID
B+Overall grade367 students15 students per teacher
#4 Best Catholic Schools in Ada County, ID
Sacred Heart Catholic School
Diocesan school · Grades Pre-K–8
Growing: enrollment up 39% since 2011–12
Boise, ID
BOverall grade195 students15 students per teacher
#5 Best Catholic Schools in Ada County, ID
Bishop Kelly High School
Diocesan school · Grades 9–12
The largest of 17 Catholic schools in Idaho
Boise, ID
BOverall grade967 students16 students per teacher
#6 Best Catholic Schools in Ada County, ID
St. Ignatius Catholic School
Diocesan school · Grades Pre-K–8
The only Catholic school in Meridian
Meridian, ID
B-Overall grade428 students18 students per teacher
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.