#1 Best Private Schools in the Diocese of Sioux City
St. Mary's School
Diocesan school · Grades 6–12
Smaller classes than 95% of Catholic schools in Iowa
Storm Lake, IA
A+Overall grade103 students7 students per teacher
2026 lists
Best Private Schools in the Diocese of Sioux City
Private schools in the Diocese of Sioux City with the highest overall grades. Top 20 of 20 schools.
#2 Best Private Schools in the Diocese of Sioux City
Sacred Heart School
Diocesan school · Grades Pre-K–8
Smaller classes than 72% of Catholic schools in Iowa
Sioux City, IA
A+Overall grade333 students9 students per teacher
#3 Best Private Schools in the Diocese of Sioux City
Bishop Garrigan Campus
Diocesan school · Grades K–12
100% of graduates go to four-year colleges
Algona, IA
A+Overall grade399 students10 students per teacher
#4 Best Private Schools in the Diocese of Sioux City
Sacred Heart School
Parish school · Grades Pre-K–8
Smaller classes than 84% of Catholic schools in Iowa
Boone, IA
A+Overall grade78 students8 students per teacher
#5 Best Private Schools in the Diocese of Sioux City
Mater Dei School
Diocesan school · Grades Pre-K–4
The smallest classes of any Catholic school in Sioux City
Sioux City, IA
A+Overall grade130 students9 students per teacher
#6 Best Private Schools in the Diocese of Sioux City
Emmetsburg Catholic School
Diocesan school · Grades Pre-K–8
Smaller classes than 69% of Catholic schools in Iowa
Emmetsburg, IA
AOverall grade78 students9 students per teacher
#7 Best Private Schools in the Diocese of Sioux City
St. Edmond Catholic School
Diocesan school · Grades Pre-K–12
90% of graduates go to four-year colleges
Fort Dodge, IA
AOverall grade548 students11 students per teacher
#8 Best Private Schools in the Diocese of Sioux City
Bishop Heelan Catholic High School
Diocesan school · Grades 9–12
96% of graduates go to four-year colleges
Sioux City, IA
A-Overall grade527 students14 students per teacher
#9 Best Private Schools in the Diocese of Sioux City
Cathedral Dual Language Academy
Parish school · Grades Pre-K–4
Smaller classes than 64% of Catholic schools in Iowa
Sioux City, IA
B+Overall grade67 students10 students per teacher
#10 Best Private Schools in the Diocese of Sioux City
St. Mary's School
Diocesan school · Grades Pre-K–12
Smaller classes than 81% of Catholic schools in Iowa
Remsen, IA
B+Overall grade195 students9 students per teacher
#11 Best Private Schools in the Diocese of Sioux City
Seton Grade School
Diocesan school · Grades Pre-K–2
Serving families in Algona since at least 2011
Algona, IA
B+Overall grade103 students12 students per teacher
#12 Best Private Schools in the Diocese of Sioux City
Gehlen Catholic School
Diocesan school · Grades Pre-K–12
95% of graduates go to four-year colleges
Le Mars, IA
B+Overall grade496 students12 students per teacher
#13 Best Private Schools in the Diocese of Sioux City
Bishop Heelan Catholic Schools
Parish school · Grades Pre-K–12
One of the 3 largest Catholic schools in Iowa
Sioux City, IA
BOverall grade1,510 students13 students per teacher
#14 Best Private Schools in the Diocese of Sioux City
St. Mary Elementary School
Diocesan school · Grades Pre-K–12
Smaller classes than 81% of Catholic schools in Iowa
Remsen, IA
BOverall grade194 students9 students per teacher
#15 Best Private Schools in the Diocese of Sioux City
St. Mary School
Diocesan school · Grades Pre-K–6
A Catholic school in Humboldt
Humboldt, IA
BOverall grade134 students11 students per teacher
#16 Best Private Schools in the Diocese of Sioux City
St. Rose of Lima School
Diocesan school · Grades Pre-K–5
A Catholic school in Denison
Denison, IA
BOverall grade95 students16 students per teacher
#17 Best Private Schools in the Diocese of Sioux City
Kuemper Catholic Grade School
Parish school · Grades Pre-K–12
Serving families in Carroll since at least 2011
Carroll, IA
B-Overall grade1,095 students13 students per teacher
#18 Best Private Schools in the Diocese of Sioux City
Mater Dei School-Nativity
Diocesan school · Grades Pre-K–8
Growing: enrollment up 102% since 2011–12
Sioux City, IA
B-Overall grade263 students26 students per teacher
#19 Best Private Schools in the Diocese of Sioux City
Sacred Heart School
Diocesan school · Grades K–6
Growing: enrollment up 16% since 2011–12
Spencer, IA
B-Overall grade179 students18 students per teacher
#20 Best Private Schools in the Diocese of Sioux City
St. Edmond Catholic School
Diocesan school · Grades Pre-K–12
One school from pre-K through 12th grade
Fort Dodge, IA
B-Overall grade548 students14 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.