Castlio Elem.
🇺🇸 Official data · 2025ST Charles, Missouri 63304 · Francis Howell R-III
#44 of 1,159 elementary schools in Missouri
#3212 of 50,301 nationally
About Castlio Elem.
Castlio Elem. is a public elementary located in ST Charles, in the Francis Howell R-III school district of Missouri, United States. It caters for Grades K–5. In 2025 it enrolled 847 students. Traditional public schools run by a school district; free to attend.
Its Success Index (US) is 83.3 out of 100, placing it in the top 10% of elementary schools in United States and 44th of 1,159 ranked elementary schools in Missouri. Its strongest component is community advantage (fewer free/reduced-price lunch) (96th percentile), and its weakest is students per teacher (71th percentile).
Other published figures: enrollment 847.
There are 34 schools in ST Charles; Castlio Elem. ranks 2nd of 28 scored schools there.
Success Index (US) breakdown
Each component is a percentile against elementary schools across United States.
- Math proficiency (30%)67%
- Reading proficiency (30%)69%
- Community advantage (fewer free/reduced-price lunch) (25%)12.2%
- Students per teacher (15%)13.0
The Success Index (US) summarises published data about a school community. It is not a measure of teaching quality. Read the methodology.
Published measures
All figures published for Castlio Elem. by the official sources.
- Enrollment
- 847
- Students enrolled in the latest NCES directory year.
- Free/reduced-price lunch
- 12.2%
- Share of students eligible for free or reduced-price lunch.
- Students per teacher
- 13.0
- Enrollment divided by FTE teachers; not class size.
- Reading proficiency
- 69%
- Share of tested students proficient or above (all students, all grades).
- Math proficiency
- 67%
- Share of tested students proficient or above (all students, all grades).
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Schools near Castlio Elem.
Closest schools by straight-line distance, with their Success Index (US).
Hollenbeck Middle
ST Charles · Public middle · Grades 6–8
769 students · 2.3 km away
Central Elem.
ST Charles · Public elementary · Grades PK–5
865 students · 2.3 km away
Early Child Family Educ. Ctr.
ST Charles · Public other · Grades PK–PK
117 students · 2.4 km away
Barnwell Middle
ST Charles · Public middle · Grades 6–8
792 students · 3.4 km away
Becky-David Elem.
ST Charles · Public elementary · Grades PK–5
812 students · 3.6 km away
Fairmount Elem.
ST Peters · Public elementary · Grades K–5
971 students · 4.1 km away
Francis Howell Central High
ST Charles · Public high · Grades 9–12
1,750 students · 4.6 km away
Saeger Middle
ST Charles · Public middle · Grades 6–8
750 students · 4.7 km away
Henderson Elem.
ST Charles · Public elementary · Grades K–5
653 students · 5.1 km away
Francis Howell North High
ST Charles · Public high · Grades 9–12
1,716 students · 5.1 km away
Similar schools
Public elementary schools in Missouri with a comparable Enrollment.
Bayless Elementary
ST Louis · Public elementary · Grades PK–5
858 students
Central Elem.
ST Charles · Public elementary · Grades PK–5
865 students
Clever Elem.
Clever · Public elementary · Grades PK–8
871 students
Becky-David Elem.
ST Charles · Public elementary · Grades PK–5
812 students
Shoal Creek Elem.
Kansas City · Public elementary · Grades K–5
795 students
Waynesville East Elem.
Waynesville · Public elementary · Grades K–5
920 students
Frequently asked questions
Is Castlio Elem. a good school?
Castlio Elem. has a Success Index (US) of 83.3 out of 100 (Top 10% of elementary schools in United States) and ranks #44 of 1,159 in Missouri. The index summarises published data about the school community and, where available, attainment; it does not measure teaching quality, so visit the school and ask about support at your child's level.
Where does Castlio Elem. rank in Missouri?
Castlio Elem. ranks #44 of 1,159 elementary schools in Missouri and #3212 of 50,301 nationally on the Success Index (US) (2025 data).
How many students attend Castlio Elem.?
Castlio Elem. had 847 students in 2025.
Is Castlio Elem. a elementary school or a high school?
Castlio Elem. is classified as a elementary covering Grades K–5. It is a public school.
What other schools are near Castlio Elem.?
There are 10 schools within 15 km of Castlio Elem.; they are listed on this page with their Success Index (US) and distance, and can be compared side by side.