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Public elementary school · Francis Howell R-III · St. Charles, Missouri

Castlio Elem.

Castlio Elem. rates 8.0, above the middle of Francis Howell R-III's elementary schools, whose rated median is 7.5.

Elementary schools, 1 to 10This campus against public elementary schools around it that are rated on verified state test data.
8.0this school

8.0 on a one-to-ten scale; the Francis Howell R-III median is 7.5.

#303 of 2,221 schools in Missouri · Francis Howell R-III: 10 elementary schools rated, median 7.5

The brief

A Francis Howell R-III elementary school where students score 6 points above what's typical for similar communities.

It ranks 303 of 2,221 schools in Missouri and 3 of 21 in Francis Howell R-III.

Castlio Elem. is listed in Francis Howell R-III, and a district label does not verify attendance for an address: confirm the zoned campus with the district before you commit to a street.

Math65%17 points above the Missouri average of 48%Grades 3–5 · 452 students tested · 2025 MAP
Reading64%16 points above the Missouri average of 48%Grades 3–5 · 452 students tested · 2025 MAP
Proficiency has held near 64% across the 17-year record (2009–2025).2025 MAP; 40 test records from MO state assessments and EdFacts (NCES).

What the rating is made of, each out of 10

Student Progress
7.6
50% of the rating
Academics
8.8
30% of the rating
Resources & Environment
7.6
20% of the rating
About this school's data1 correction under review · rating: low confidence · 7 sources, 2019–2025

Every number on this page comes from a published source with a stated period. Where a source is partial, aging, an estimate, or describes a surrounding area rather than the school, that limitation is named here.

Attendance data is under correction. This existing Resources & Environment score and overall rating may still reflect an unverified attendance input.

Full Profile · 3/3 metrics

Multi-year averages used by the rating model: math 67% (multi-year average, 2009-2025) · reading/ELA 68% (multi-year average, 2009-2025).

School directory (enrollment, grades, staff, contact)
NCES Common Core of Data (CCD) · SY 2023–24 · Medium confidence
  • Source period: SY 2023–24. A newer release may be available.
MySchoolScout rating and rank
MySchoolScout ranking model · Low confidence
  • Vintage not available. Do not use this measure alone.
  • Derived as a weighted blend of the component scores shown in Academics from state assessment, EdFacts growth, and NCES resource records.
Math proficiency
State department of education · 2025 MAP · Medium confidence
  • Available for part of the eligible units; results may not represent the full area.
  • Derived from source records rather than read directly from one field.
Reading/ELA proficiency
State department of education · 2025 MAP · Medium confidence
  • Available for part of the eligible units; results may not represent the full area.
  • Derived from source records rather than read directly from one field.
Student progress (growth)
State assessments · Mixed source periods · Low confidence
  • Vintage not available. Do not use this measure alone.
  • Available for part of the eligible units; results may not represent the full area.
  • Derived as the fitted year-over-year slope of proficiency from multi-year assessment records.
Neighborhood (income, housing, education)
U.S. Census ACS 5-year estimates · ACS 2019–2023 5-year estimates · Low confidence
  • Older source: ACS 2019–2023 5-year estimates. Use as historical context.
  • Reported for the ZCTA for ZIP 63304; this does not measure the attendance area.
Programs (AP/IB, athletics, gifted)
CRDC via Urban Institute · SY 2021–22 · Medium confidence
  • Available for part of the eligible units; results may not represent the full area.
  • Source period: SY 2021–22. A newer release may be available.

Evidence periods: Rating mixed/unknown input periods; assessments multi-year average, 2009-2025; directory SY 2023–24

About our dataHow we calculate scores

The neighborhood

Where it sits, and what the area looks like.
Castlio Elem. and the 20 nearest elementary schools, each pin colored by its score.Pins are locations, not attendance boundaries. Verify the enrollment path with the district.

Open the St. Louis school map to see school quality against home prices across the metro.

The area

Median income
$114,124
Median home value
$331,300
Median rent
$1,618/mo
College educated
48%
Homeownership
88.4%
Poverty rate
4%

U.S. Census ACS 5-year estimates · ACS 2019–2023 5-year estimates for the ZCTA associated with school ZIP 63304; this is area context, not an attendance boundary.

Getting around

Walk Score
11
Car-Dependent
Bike Score
13
Somewhat Bikeable
City reported crime
999/100K
Reported Part-1 offenses (violent + property + arson) per 100,000 residents, from the FBI Uniform Crime Reporting program for St. Charles. This is a city-level reported-crime measure, not a school safety rating.

Walk, transit and bike scores byWalk Score

FBI Uniform Crime Reporting · 2025 · city context (St. Charles), not school-level safety or attendance eligibility. Source details

Source period: 2025. Freshness not available.

Programs and who goes here

What the campus offers, and who it enrolls.

Programs

Gifted and talented
Available
A program for qualifying students · CRDC via Urban Institute · SY 2021–22

Who goes here

Free or reduced lunch
12.3%
Students qualifying for federal meal assistance. Shown separately, never in the score.

NCES Common Core of Data (CCD).

Compare nearby

Grade-compatible schools using the same rating model.
Public-school ratings. Grade-compatible schools within 5 miles, best rated first.
  1. Independence Elem.3.9 mi
    8.5Compare →
  2. Warren Elem.3.8 mi
    8.4Compare →
  3. Castlio Elem.this school
    8.0
  4. Becky-David Elem.2.2 mi
    7.9Compare →
  5. Central Elem.1.4 mi
    7.2Compare →
  6. Lewis Clark Elem.4.6 mi
    7.1Compare →
  7. Hawthorn Elem.4.1 mi
    6.2Compare →
  8. Henderson Elem.3.2 mi
    5.6Compare →
  9. Fairmount Elem.2.5 mi
    4.8Compare →
Eight grade-compatible schools using the same rating model sit within 5 miles, and two rate higher than Castlio Elem..Public-school ratings. Straight-line distance from this campus. Pins are locations, not attendance boundaries; verify the enrollment path with the district.

Distance is proximity only; it is not attendance eligibility.

Enrollment path unverified: Potential public school; its attendance or application path has not been classified.

The record

What is on file, and where each number came from.

Questions families ask

What grades does Castlio Elem. serve?

Castlio Elem. serves students in grades Kindergarten through 5th.

How many students attend Castlio Elem.?

Castlio Elem. has an enrollment of approximately 838 students.

What is the student-teacher ratio at Castlio Elem.?

The student-teacher ratio at Castlio Elem. is 13.1:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.

How does Castlio Elem. rank in MO?

Castlio Elem. ranks #303 of 2,221 schools in MO.

What is Castlio Elem.'s MySchoolScout rating?

Castlio Elem. has a current MySchoolScout rating of 8.0 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.

What are the test scores at Castlio Elem.?

Based on loaded state assessment records, Castlio Elem. has 67% math proficiency (multi-year average, 2009-2025) and 68% reading/ELA proficiency (multi-year average, 2009-2025).

Is Castlio Elem. a charter school?

No, Castlio Elem. is not a charter school. It is a traditional public school operated by the local school district.

Is Castlio Elem. a Title I school?

No, Castlio Elem. is not currently a Title I school.

What does the Free & Reduced Lunch percentage mean for Castlio Elem.?

12.3% of students at Castlio Elem. qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.

School facts

Grades
Kindergarten – 5th
Enrollment
838
Student-teacher ratio
13.1:1
Teachers (FTE)
64
Type
Regular
Title I
No
Setting
Large Suburb
County
St. Charles County
Phone
(636) 851-4300
Rank in district
#3 of 21
Schools in district
23
District spending per student
$12,462
NCES F-33 · FY 2023 · This annual source is three years behind the current year.
District child poverty rate
5.1%
Census SAIPE · 2024
Area population (ZIP 63304)
43,389
Area average commute
24.9 min
Area median age
41.3

NCES Common Core of Data (CCD) (SY 2023–24).

Sources and official links

Keep exploring

Related reading

Data from NCES Common Core of Data, Missouri Dept. of Education, and U.S. Census ACS for the 2023–24 school year. Rankings computed by MySchoolScout. See all data sources.