2026 lists

Largest Private Schools in Jefferson County, MO

The private schools in Jefferson County, MO with the most students. Top 6 of 6 schools.

#1 Largest Private Schools in Jefferson County, MO

Diocesan school · Grades Pre-K–8

330 students

Imperial, MO

BOverall grade330 students13 students per teacher

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#2 Largest Private Schools in Jefferson County, MO

Parish school · Grades Pre-K–8

191 students

Arnold, MO

BOverall grade191 students14 students per teacher

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#3 Largest Private Schools in Jefferson County, MO

Parish school · Grades Pre-K–8

181 students

Festus, MO

BOverall grade181 students12 students per teacher

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#4 Largest Private Schools in Jefferson County, MO

Lutheran (Missouri Synod) school · Grades Pre-K–8

173 students

Arnold, MO

BOverall grade173 students13 students per teacher

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#5 Largest Private Schools in Jefferson County, MO

Diocesan school · Grades 6–8

154 students

Festus, MO

BOverall grade154 students13 students per teacher

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#6 Largest Private Schools in Jefferson County, MO

Independent Catholic school · Grades Pre-K–8

95 students

De Soto, MO

B+Overall grade95 students10 students per teacher

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From official public records, updated October 2026.