#1 Best Catholic 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 Catholic Schools in the Diocese of Sioux City
The highest-graded schools of this kind in the Diocese of Sioux City. Top 20 of 20 schools.
#2 Best Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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 Catholic 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.