Serving 362 students in grades Kindergarten-5, Ostmann Elementary School ranks in the top 5% of all schools in Missouri for overall test scores (math proficiency is top 10%, and reading proficiency is top 10%).
The percentage of students achieving proficiency in math is 60-64% (which is higher than the Missouri state average of 40%). The percentage of students achieving proficiency in reading/language arts is 70-74% (which is higher than the Missouri state average of 43%).
The student-teacher ratio of 12:1 is equal to the Missouri state level of 12:1.
Minority enrollment is 20% of the student body (majority Asian and Black), which is lower than the Missouri state average of 33% (majority Black).
Quick Facts (2026-27)
- Grades: Kindergarten-5
- Enrollment: 362 students
- Student-Teacher Ratio: 12:1
- Minority Enrollment: 20%
- Overall Testing Rank: Top 5% in MO
- Math Proficiency: 60-64% (Top 10%)
- Reading Proficiency: 70-74% (Top 5%)
- Science Proficiency: 60-69% (Top 5%)
- Attendance Zone: Ostmann Elementary serves the southern part of O'Fallon, MO, covering an area of approximately 1.8 square miles. Families within this zone can typically expect a drive of 5 to 10 minutes to the school, with the furthest edge being about 2 miles away.
- Source: National Center for Education Statistics (NCES), MO Dept. of Education
Top Rankings
Ostmann Elementary School ranks among the top 20% of public schools in Missouri for:
Category
Attribute
Overall Rank
Most improved public schools
Math Proficiency
Reading/Language Arts Proficiency
Science Proficiency
School Overview
Ostmann Elementary School's student population of 362 students has stayed relatively flat over five school years.
The teacher population of 30 teachers has declined by 16% over five school years.
Grades Offered
Grades Kindergarten-5
(No virtual instruction)
(No virtual instruction)
Total Students
362 students
Total Classroom Teachers
30 teachers
School Rankings
Ostmann Elementary School ranks within the top 5% of all 2,076 schools in Missouri (based off of combined math and reading proficiency testing data).
The diversity score of Ostmann Elementary School is 0.35, which is less than the diversity score at state average of 0.52. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#76 out of 2076 schools
(Top 5%)
(Top 5%)
Math Test Scores (% Proficient)
60-64%
40%
Reading/Language Arts Test Scores (% Proficient)
70-74%
43%
Science Test Scores (% Proficient)
60-69%
38%
Student-Teacher Ratio
12:1
12:1
American Indian
1%
n/a
Asian
8%
2%
Hispanic
4%
9%
Black
4%
15%
White
80%
67%
Hawaiian
n/a
1%
Two or more races
3%
6%
All Ethnic Groups
Chronically Absent Students
(22-23)7.7%
20.5%
Eligible for Free Lunch
7%
43%
Eligible for Reduced Lunch
1%
7%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), MO Dept. of Education
Frequently Asked Questions
What is Ostmann Elementary School's ranking?
Ostmann Elementary School is ranked #76 out of 2,076 schools, which ranks it among the top 5% of public schools in Missouri.
What schools are Ostmann Elementary School often compared to?
Ostmann Elementary Schoolis often viewed alongside schools like Dardenne Elementary School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
60-64% of students have achieved math proficiency (compared to the 40% MO state average), while 70-74% of students have achieved reading proficiency (compared to the 43% MO state average).
How many students attend Ostmann Elementary School?
362 students attend Ostmann Elementary School.
What is the racial composition of the student body?
80% of Ostmann Elementary School students are White, 8% of students are Asian, 4% of students are Hispanic, 4% of students are Black, 3% of students are Two or more races, and 1% of students are American Indian.
What is the student-teacher ratio of Ostmann Elementary School?
Ostmann Elementary School has a student ration of 12:1, which is equal to the Missouri state average of 12:1.
What grades does Ostmann Elementary School offer ?
Ostmann Elementary School offers enrollment in grades Kindergarten-5 (No virtual instruction).
What school district is Ostmann Elementary School part of?
Ostmann Elementary School is part of Fort Zumwalt School District.
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