#1 Largest Private Schools in Sioux City, IA
Bishop Heelan Catholic Schools
Parish school · Grades Pre-K–12
1,510 students
Sioux City, IA
BOverall grade1,510 students13 students per teacher
2026 lists
Largest Private Schools in Sioux City, IA
The private schools in Sioux City, IA with the most students. Top 8 of 8 schools.
#2 Largest Private Schools in Sioux City, IA
Bishop Heelan Catholic High School
Diocesan school · Grades 9–12
527 students
Sioux City, IA
A-Overall grade527 students14 students per teacher
#3 Largest Private Schools in Sioux City, IA
Souixland Christian School
Christian school (nondenominational) · Grades Pre-K–12
449 students
Sioux City, IA
B+Overall grade449 students8 students per teacher
#4 Largest Private Schools in Sioux City, IA
Sacred Heart School
Diocesan school · Grades Pre-K–8
333 students
Sioux City, IA
A+Overall grade333 students9 students per teacher
#5 Largest Private Schools in Sioux City, IA
Mater Dei School-Nativity
Diocesan school · Grades Pre-K–8
263 students
Sioux City, IA
B-Overall grade263 students26 students per teacher
#6 Largest Private Schools in Sioux City, IA
Mater Dei School
Diocesan school · Grades Pre-K–4
130 students
Sioux City, IA
A+Overall grade130 students9 students per teacher
#7 Largest Private Schools in Sioux City, IA
Cathedral Dual Language Academy
Parish school · Grades Pre-K–4
67 students
Sioux City, IA
B+Overall grade67 students10 students per teacher
#8 Largest Private Schools in Sioux City, IA
St. Pauls Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–5
28 students
Sioux City, IA
AOverall grade28 students6 students per teacher
From official public records, updated October 2026.