#1 Best Private Schools in St. Charles County, MO
All Saints School
Parish school · Grades Pre-K–8
The only Catholic school in Saint Peters
Saint Peters, MO
A+Overall grade125 students7 students per teacher
2026 lists
Best Private Schools in St. Charles County, MO
Private schools in St. Charles County, MO with the highest overall grades. Top 25 of 25 schools.
#2 Best Private Schools in St. Charles County, MO
Duchesne High School
Diocesan school · Grades 9–12
Smaller classes than 83% of Catholic schools in Missouri
Saint Charles, MO
A+Overall grade225 students8 students per teacher
#3 Best Private Schools in St. Charles County, MO
Academy of the Sacred Heart
Independent Catholic school · Grades Pre-K–8
Smaller classes than 68% of Catholic schools in Missouri
Saint Charles, MO
A+Overall grade164 students10 students per teacher
#4 Best Private Schools in St. Charles County, MO
St. Cletus School
Parish school · Grades Pre-K–8
Smaller classes than 70% of Catholic schools in Missouri
Saint Charles, MO
A+Overall grade176 students10 students per teacher
#5 Best Private Schools in St. Charles County, MO
St. Joseph School-Josephville
Diocesan school · Grades Pre-K–8
The smallest classes of any Catholic school in Wentzville
Wentzville, MO
A-Overall grade79 students9 students per teacher
#6 Best Private Schools in St. Charles County, MO
Andrews Academy
Independent school · Grades K–8
The largest independent school in Lake Saint Louis
Lake Saint Louis, MO
B+Overall grade123 students5 students per teacher
#7 Best Private Schools in St. Charles County, MO
Lafayette Academy
Independent school · Grades K–12
Smaller classes than 72% of independent schools in Missouri
Lake Saint Louis, MO
B+Overall grade77 students6 students per teacher
#8 Best Private Schools in St. Charles County, MO
First Baptist Christian Academy
Baptist school · Grades Pre-K–8
The smallest classes of any Christian school in O'Fallon
O'Fallon, MO
B+Overall grade163 students11 students per teacher
#9 Best Private Schools in St. Charles County, MO
Child of God Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
Growing: enrollment up 96% since 2011–12
Saint Peters, MO
BOverall grade139 students13 students per teacher
#10 Best Private Schools in St. Charles County, MO
Sts. Joachim & Ann School
Parish school · Grades Pre-K–8
One of 7 Catholic schools in Saint Charles
Saint Charles, MO
BOverall grade155 students12 students per teacher
#11 Best Private Schools in St. Charles County, MO
Seton Regional Catholic School
Parish school · Grades Pre-K–8
Growing: enrollment up 16% since 2011–12
Saint Charles, MO
BOverall grade248 students16 students per teacher
#12 Best Private Schools in St. Charles County, MO
Lutheran High School of St. Charles County
Lutheran (Missouri Synod) school · Grades 9–12
89% of graduates go to four-year colleges
Saint Peters, MO
BOverall grade460 students15 students per teacher
#13 Best Private Schools in St. Charles County, MO
St. John Paul II Preparatory
Independent Catholic school · Grades Pre-K–12
The smallest classes of any Catholic school in Saint Charles
Saint Charles, MO
B-Overall grade176 students7 students per teacher
#14 Best Private Schools in St. Charles County, MO
St. Dominic High School
Diocesan school · Grades 9–12
The largest of 188 Catholic schools in Missouri
O'Fallon, MO
B-Overall grade1,087 students17 students per teacher
#15 Best Private Schools in St. Charles County, MO
Immanuel Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
The largest Christian school in Saint Charles
Saint Charles, MO
B-Overall grade366 students13 students per teacher
#16 Best Private Schools in St. Charles County, MO
Assumption Catholic School
Parish school · Grades Pre-K–8
One of 2 Catholic schools in O'Fallon
O'Fallon, MO
B-Overall grade374 students14 students per teacher
#17 Best Private Schools in St. Charles County, MO
Immaculate Conception School
Parish school · Grades Pre-K–8
Serving families in Dardenne Prairie since at least 2011
Dardenne Prairie, MO
B-Overall grade715 students19 students per teacher
#18 Best Private Schools in St. Charles County, MO
St. Theodore School
Parish school · Grades Pre-K–8
Growing: enrollment up 23% since 2011–12
Wentzville, MO
B-Overall grade260 students16 students per teacher
#19 Best Private Schools in St. Charles County, MO
St. Joseph School
Parish school · Grades Pre-K–8
One of the 3 largest Catholic schools in Missouri
Saint Charles, MO
B-Overall grade891 students20 students per teacher
#20 Best Private Schools in St. Charles County, MO
Zion Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
Growing: enrollment up 30% since 2011–12
Saint Charles, MO
B-Overall grade364 students18 students per teacher
#21 Best Private Schools in St. Charles County, MO
St. Patrick School
Diocesan school · Grades Pre-K–8
The largest Catholic school in Wentzville
Wentzville, MO
B-Overall grade436 students17 students per teacher
#22 Best Private Schools in St. Charles County, MO
Christian School District
Christian school (nondenominational) · Grades Pre-K–12
The largest Christian school in O'Fallon
O'Fallon, MO
B-Overall grade596 students12 students per teacher
#23 Best Private Schools in St. Charles County, MO
St. Paul Elementary School
Parish school · Grades Pre-K–8
Growing: enrollment up 24% since 2011–12
Saint Paul, MO
B-Overall grade222 students19 students per teacher
#24 Best Private Schools in St. Charles County, MO
Immanuel Lutheran School
Lutheran (Missouri Synod) school · Grades K–8
Growing: enrollment up 26% since 2019–20
Wentzville, MO
B-Overall grade385 students15 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.