Enrollment
847
Missouri · 2024-25 NCES data
Elementary school (grades K-5) · St Charles, MO
Castlio Elem.
Federal NCES profile for Castlio Elem., including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 62/100.
2024-25 NCES dataElementary school (grades K-5)NCES 292895001856
👥 S:T ratio 45
🌟 Gifted program 70
🎓 Counselors 52
📋 Attendance 82
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Castlio Elem. earns 62/100 on the Resource Investment Index, with class sizes near the Missouri median.
- #3 of 9
- elementary schools in St Charles · Resource Index
- 62
- Resource Index · Higher
- 13.7:1
- students per teacher
- 8.9%
- free-lunch eligible
Castlio Elem. has class sizes near the Missouri median. Computed live against every Missouri school reporting to NCES.
By Resource Investment Index, Castlio Elem. ranks #3 of 9 elementary schools in St Charles, MO.
School address
District: Francis Howell R-Iii · Missouri
NCES ID 292895001856 Verify on NCES CCD record →
Teachers (FTE)
62.0
Federal CCD staff survey
Students per teacher
13.7:1
vs 12.8:1 Missouri avg
+7% vs state
Free-lunch eligible
8.9%
vs 46.1% Missouri avg
-81% vs state
Student-teacher ratio in context
How Castlio Elem. compares with Missouri and U.S. medians
What stands out at Castlio Elem.
Castlio Elem. is a lower-poverty, large elementary school in St Charles, Missouri, enrolling 847 students.
Class loads run somewhat heavier than typical: 13.7:1 puts it in the larger third of Missouri schools by student-teacher ratio.
Comparatively few students face economic hardship here, 8.9% free-meal eligibility runs 81% below the Missouri average.
By headcount it is one of the larger campuses in Missouri, bigger than 93% of state schools at 847 students.
Its Resource Investment Index outscores 92% of the 2,313 Missouri schools with a score on record, a top-tier result on this measure.
Among 139 similarly sized, similarly resourced-need Missouri schools statewide, it ranks #4, a top-tier result once campus size and economic need are matched.
Its student body is led by White (74%) and Asian (8%) (diversity index 44/100).
Counselor coverage is strong, about 242 students per counselor, inside the American School Counselor Association's recommended 250:1.
Attendance holds up well here: only 7.4% of students were chronically absent, below the typical post-pandemic national figure.
Francis Howell R-Iii also operates Francis Howell High (1,843 students) and Francis Howell Central High (1,750 students) alongside Castlio 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 Castlio Elem. compares
Castlio 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 | 13.7:1 | ▲ 7% | 12.8:1 | 15.7:1 |
| Free-lunch eligible | 8.9% | ▼ 81% | 46.1% | 51.7% |
| Enrollment | 847 | top 7% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
13.7:1
Leaner classes than 60% of US schools, a middle-of-the-pack class size.
847
Bigger than 87% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
8.9%
free-lunch eligible
- 81% 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
13.7:1
students per teacher
- 7% above state mean
Top 65% in Missouri - lower ratio than 35% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
7.4%
chronically absent (missed 10%+ of school days)
In the 5-10% range, close to the pre-pandemic national baseline.
Funding equity
$11,775
per pupil, district-wide
- below Missouri avg of $12,931
Well below the U.S. average per-pupil spend, a notably leaner funding position that may affect programs, facilities, and staffing.
Support staff
Counselors3.5 FTE
Per 242 students, the combined health-and-guidance staffing load for this school.
Discipline context
4
in-school suspensions + 7 out-of-school
Suspension rate: 0.5 per 100 students. Combined in-school and out-of-school rate: 1.3 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 73.8%
Asian 7.7%
Hispanic or Latino 6.4%
Two or More 6.4%
African American 5.4%
American Indian / Alaska Native 0.4%
Largest group: White at 73.8% of enrollment.
Student-body diversity index 43.8/100
Simpson diversity index - at 43.8, Castlio Elem. is more mixed than the Missouri school average of 31.0.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Francis Howell R-Iii, which includes Castlio Elem..
$11,775
Per student
-9%
vs Missouri
Avg $12,931
-29%
vs U.S.
Avg $16,593
Revenue mix
Local 73.3%
State 19.7%
Federal 6.9%
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 Castlio Elem. Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Francis Howell High | Larger | Similar economic need | Higher S:T ratio |
| Francis Howell Central High | Larger | Similar economic need | Higher S:T ratio |
| Francis Howell North High | Larger | Similar economic need | Higher S:T ratio |
| Fairmount Elem. | Similar size | Similar economic need | Similar S:T ratio |
| Central Elem. | Similar size | Higher economic need | Similar S:T ratio |
Comparisons are relative to Castlio Elem.'s own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,843
- Students per teacher
- 20:1
- Resource Index
- 49/100
- Enrollment
- 1,750
- Students per teacher
- 18.8:1
- Resource Index
- 51/100
- Enrollment
- 1,716
- Students per teacher
- 19.1:1
- Resource Index
- 48/100
- Enrollment
- 971
- Students per teacher
- 12.4:1
- Resource Index
- 63/100
- Enrollment
- 865
- Students per teacher
- 14:1
- Resource Index
- 63/100
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 (~847 students)
Similar student-teacher ratio (~13.7:1)
Next steps
Verify locally before acting on Castlio Elem.'s federal record.
- Compare Castlio Elem. against another school. Compare schools
- Francis Howell R-Iii'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 Castlio Elem.
How many students attend Castlio Elem.?
Castlio Elem. has 847 students enrolled. It is an elementary school in St Charles, MO.
What is the student-teacher ratio at Castlio Elem.?
The student-teacher ratio at Castlio Elem. is 13.7:1, which is 7% higher than the Missouri average of 12.8:1 and 13% lower than the national average of 15.7:1.
What percentage of students receive free lunch at Castlio Elem.?
8.9% of students at Castlio Elem. are eligible for free lunch, compared to the Missouri average of 46.1%.
What is the racial and ethnic makeup of Castlio Elem.?
The largest demographic group at Castlio Elem. is White at 73.8% of enrollment, in St Charles, MO.
What is the Resource Investment Index for Castlio Elem.?
Castlio Elem. has a Resource Investment Index of 62/100 (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 Castlio Elem. rank among elementary schools in St Charles?
By Resource Investment Index, Castlio Elem. ranks #3 of 9 elementary schools in St Charles, 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 St Charles on the city page.
Is Castlio Elem. a good school?
Castlio Elem. earns 62/100 on the Resource Investment Index, with class sizes near the Missouri median. 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 Francis Howell R-Iii?
Besides Castlio Elem., Francis Howell R-Iii also operates Francis Howell High (1,843 students), Francis Howell Central High (1,750 students), and Francis Howell North High (1,716 students). See the Francis Howell R-Iii 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.