#1 Best Private Middle 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 Middle Schools in St. Charles County, MO
Private schools in St. Charles County, MO with middle-school grades and the highest overall grades. Top 22 of 22 schools.
#2 Best Private Middle 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
#3 Best Private Middle 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
#4 Best Private Middle 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
#5 Best Private Middle 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
#6 Best Private Middle 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
#7 Best Private Middle 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
#8 Best Private Middle 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
#9 Best Private Middle 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
#10 Best Private Middle 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
#11 Best Private Middle 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
#12 Best Private Middle 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
#13 Best Private Middle 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
#14 Best Private Middle 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
#15 Best Private Middle 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
#16 Best Private Middle 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
#17 Best Private Middle 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
#18 Best Private Middle 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
#19 Best Private Middle 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
#20 Best Private Middle 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
#21 Best Private Middle 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
#22 Best Private Middle 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 students13 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.