Enrollment
401
Missouri · 2024-25 NCES data
Elementary school (grades K-5) · Ballwin, MO
Oak Brook Elem.
Federal NCES profile for Oak Brook Elem., including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 59/100.
2024-25 NCES dataElementary school (grades K-5)NCES 292358002626
👥 S:T ratio 36
🌟 Gifted program 70
🎓 Counselors 60
📋 Attendance 71
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Oak Brook Elem. earns 59/100 on the Resource Investment Index, with class sizes larger than 87% of Missouri schools.
- #3 of 9
- elementary schools in Ballwin · Resource Index
- 59
- Resource Index · Higher
- 16:1
- large classes for Missouri
- 7.7%
- free-lunch eligible
Oak Brook Elem. has class sizes larger than 87% of Missouri schools. Computed live against every Missouri school reporting to NCES.
By Resource Investment Index, Oak Brook Elem. ranks #3 of 9 elementary schools in Ballwin, MO.
School address
Teachers (FTE)
25.0
Federal CCD staff survey
Students per teacher
16:1
vs 12.8:1 Missouri avg
+25% vs state
Free-lunch eligible
7.7%
vs 46.1% Missouri avg
-83% vs state
Student-teacher ratio in context
How Oak Brook Elem. compares with Missouri and U.S. medians
What stands out at Oak Brook Elem.
Oak Brook Elem. is a lower-poverty, mid-sized elementary school in Ballwin, Missouri, enrolling 401 students.
Class loads run heavy: 16:1 is larger than about 87% of Missouri schools and 25% above the 12.8:1 state mean, so each teacher carries more students than is typical.
Comparatively few students face economic hardship here, 7.7% free-meal eligibility runs 83% below the Missouri average.
Enrollment of 401 puts it in the larger third of Missouri schools by headcount.
Its Resource Investment Index lands in the upper third of 2,313 scored Missouri schools.
Against 200 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #24.
Its student body is led by White (73%) and Asian (13%) (diversity index 45/100).
Counselor coverage is strong, about 201 students per counselor, inside the American School Counselor Association's recommended 250:1.
11.7% of students were chronically absent in the 2021-22 collection, in line with the post-pandemic national range.
Parkway C-2 also operates South High (1,485 students) and West High (1,417 students) alongside Oak Brook Elem..
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Oak Brook Elem. compares
Oak Brook Elem. on the metrics families compare, against Missouri and U.S. means.
| Metric | This school | vs Missouri | Missouri avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 16:1 | ▲ 25% | 12.8:1 | 15.7:1 |
| Free-lunch eligible | 7.7% | ▼ 83% | 46.1% | 51.7% |
| Enrollment | 401 | top 35% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
16:1
Leaner classes than 38% of US schools, a middle-of-the-pack class size.
401
Bigger than 48% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
7.7%
free-lunch eligible
- 83% below the Missouri average of 46.1%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
16:1
students per teacher
- 25% above state mean
Top 87% in Missouri - lower ratio than 13% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
11.7%
chronically absent (missed 10%+ of school days)
In the 10-15% range, above the pre-pandemic national baseline but within the broader post-pandemic picture.
Funding equity
$14,102
per pupil, district-wide
- above Missouri avg of $12,931
Somewhat below the U.S. average per-pupil spend; funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors2.0 FTE
Per 201 students, the combined health-and-guidance staffing load for this school.
Discipline context
6
in-school suspensions + 6 out-of-school
Suspension rate: 1.5 per 100 students. Combined in-school and out-of-school rate: 3.0 per 100 students. Reported via the Civil Rights Data Collection.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
White 72.6%
Asian 13.2%
Two or More 6.2%
African American 3.7%
Hispanic or Latino 3.5%
American Indian / Alaska Native 0.7%
Largest group: White at 72.6% of enrollment.
Student-body diversity index 44.9/100
Simpson diversity index - at 44.9, Oak Brook Elem. is more mixed than the Missouri school average of 31.0.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Parkway C-2, which includes Oak Brook Elem..
$14,102
Per student
+9%
vs Missouri
Avg $12,931
-15%
vs U.S.
Avg $16,593
Revenue mix
Local 89.1%
State 4.2%
Federal 6.7%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Oak Brook Elem. Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| South High | Larger | Higher economic need | Lower S:T ratio |
| West High | Larger | Similar economic need | Similar S:T ratio |
| Central High | Larger | Similar economic need | Similar S:T ratio |
| North High | Larger | Higher economic need | Lower S:T ratio |
| Central Middle | Larger | Similar economic need | Lower S:T ratio |
Comparisons are relative to Oak Brook Elem.'s own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,485
- Students per teacher
- 14:1
- Resource Index
- 51/100
- Enrollment
- 1,417
- Students per teacher
- 16.1:1
- Resource Index
- 52/100
- Enrollment
- 1,281
- Students per teacher
- 15.8:1
- Resource Index
- 53/100
- Enrollment
- 990
- Students per teacher
- 12.4:1
- Resource Index
- 55/100
- Enrollment
- 881
- Students per teacher
- 13:1
- Resource Index
- 56/100
Similar elementary schools statewide
Matched by enrollment size and by staffing ratio across all of Missouri, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~401 students)
Similar student-teacher ratio (~16:1)
Next steps
Verify locally before acting on Oak Brook Elem.'s federal record.
- Compare Oak Brook Elem. against another school. Compare schools
- Parkway C-2's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Oak Brook Elem.
How many students attend Oak Brook Elem.?
Oak Brook Elem. has 401 students enrolled. It is an elementary school in Ballwin, MO.
What is the student-teacher ratio at Oak Brook Elem.?
The student-teacher ratio at Oak Brook Elem. is 16:1, which is 25% higher than the Missouri average of 12.8:1 and 2% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Oak Brook Elem.?
7.7% of students at Oak Brook Elem. are eligible for free lunch, compared to the Missouri average of 46.1%.
What is the racial and ethnic makeup of Oak Brook Elem.?
The largest demographic group at Oak Brook Elem. is White at 72.6% of enrollment, in Ballwin, MO.
What is the Resource Investment Index for Oak Brook Elem.?
Oak Brook Elem. has a Resource Investment Index of 59/100 (higher reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Oak Brook Elem. rank among elementary schools in Ballwin?
By Resource Investment Index, Oak Brook Elem. ranks #3 of 9 elementary schools in Ballwin, MO. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all elementary schools in Ballwin on the city page.
Is Oak Brook Elem. a good school?
Oak Brook Elem. earns 59/100 on the Resource Investment Index, with class sizes larger than 87% of Missouri schools. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in Parkway C-2?
Besides Oak Brook Elem., Parkway C-2 also operates South High (1,485 students), West High (1,417 students), and Central High (1,281 students). See the Parkway C-2 district page for the complete list.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.