Castlio Elementary School (Ranked Top 10% for 2026)

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Castlio Elementary School

1020 Dingledine Rd
Saint Charles, MO 63304

( shown in map)

10/

Top 10%

Serving 838 students in grades Kindergarten-5, Castlio Elementary School ranks in the top 10% of all schools in Missouri for overall test scores (math proficiency is top 20%, and reading proficiency is top 20%).

The percentage of students achieving is 61% (which is higher than the Missouri state average of 40%). The percentage of students achieving is 63% (which is higher than the Missouri state average of 43%).

The student-teacher ratio of 13:1 is higher than the Missouri state level of 12:1.

Minority enrollment is 23% of the student body (majority Hispanic and Asian), which is lower than the Missouri state average of 32% (majority Black).

Quick Facts (2026)

Grades: Kindergarten-5
Enrollment: 838 students
Student-Teacher Ratio: 13:1
Minority Enrollment: 23%
: Top 10% in MO
: 61% (Top 20%)
: 63% (Top 10%)
: 55-59% (Top 10%)
Source: National Center for Education Statistics (NCES), MO Dept. of Education

<�鶹��ý class="so-dt-title" id="top-rankings">Top Rankings

Castlio Elementary School ranks among the top 20% of public schools in Missouri for:

Category

Attribute

Overall Rank

Highest overall rank (Top 10%)

Math Proficiency

Highest math proficiency (Top 20%)

Reading/Language Arts Proficiency

Highest reading/language arts proficiency (Top 10%)

Science Proficiency

Highest science proficiency (Top 10%)

<�鶹��ý class='so-dt-title' id="overview">School Overview

Castlio Elementary School's student population of 838 students has stayed relatively flat over five school years.

The teacher population of 65 teachers has stayed relatively flat over five school years.

Grades Offered

Grades Kindergarten-5
(No virtual instruction)

View Data

Distribution of Students By Grade Trends
Grade	Castlio Elementary School
Kind	127
1	142
2	133
3	151
4	146
5	139

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Total Students

838 students

View Data

Total Students Trends Over Years (1987-2023)
Year	Castlio Elementary School
2023	818
2022	798
2021	801
2020	794
2019	794
2018	793
2017	793
2016	822
2015	849
2014	887
2013	897
2012	876
2011	909
2010	936
2009	951
2008	975
2007	972
2006	939
2005	943
2004	973
2003	977
2002	990
2001	999
2000	1,117
1999	1,360
1998	1,481
1997	1,472
1996	1,421
1995	1,499
1994	1,425
1993	1,359
1992	1,260
1991	1,476
1990	1,374
1989	691
1988	635
1987	611

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Gender %

Total Classroom Teachers

65 teachers

View Data

Total Classroom Teachers Trends Over Years (1987-2023)
Year	Castlio Elementary School
2023	62
2022	63
2021	63
2020	60
2019	60
2018	60
2017	60
2016	63
2015	69
2014	70
2013	66
2012	61
2011	65
2010	64
2009	67
2008	65
2007	63
2006	64
2005	64
2004	64
2003	62
2002	62
2001	61
2000	71
1999	87
1998	86
1997	88
1996	82
1995	89
1994	85
1993	79
1992	75
1991	84
1990	63
1989	31
1988	29
1987	33

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School Calendar

<�鶹��ý class='so-dt-title' id="school-rankings">School Rankings

Castlio Elementary School ranks within the top 10% of all 2,076 schools in Missouri (based off of combined math and reading proficiency testing data).

The of Castlio Elementary School is 0.40, which is less than the diversity score at state average of 0.51. The school's diversity has stayed relatively flat over five school years.

This School

State Level (MO)

#169 out of 2076 schools
(Top 10%)

View Data

Overall School Rank Trends Over Years (2012-2023)
Year	Castlio Elementary School
2023	#169
2022	#167
2021	#132
2019	#123
2018	#159
2017	#62
2016	#221
2015	#207
2014	#171
2013	#74
2012	#84

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61%

40%

View Data

Math Proficiency Comparison Over Years (2012-2023)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2023	61%	40%	60%
2022	60%	39%	60%
2021	59%	37%	53%
2019	67%	42%	65%
2018	66%	42%	64%
2017	78%	47%	67%
2016	73%	48%	67%
2015	65%	44%	62%
2014	70%	52%	67%
2013	80%	53%	68%
2012	78%	55%	69%

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63%

43%

View Data

Reading and Language Arts Proficiency Comparison Over Years (2011-2022)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2022	63%	43%	63%
2021	65%	46%	63%
2019	69%	49%	68%
2018	67%	49%	64%
2017	82%	61%	77%
2016	80%	63%	77%
2015	79%	60%	75%
2014	68%	53%	67%
2013	72%	55%	70%
2012	72%	55%	68%
2011	64%	55%	66%

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55-59%

38%

View Data

Science Proficiency Comparison Over Years (2021-2022)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2022	57%	38%	58%
2021	57%	37%	53%

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Student-Teacher Ratio

13:1

12:1

View Data

Student-Teacher Ratio Comparison Over Years (1987-2023)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2023	13:1	13:1	15:1
2022	13:1	13:1	15:1
2021	13:1	13:1	14:1
2020	13:1	13:1	15:1
2019	13:1	13:1	15:1
2018	13:1	14:1	16:1
2017	13:1	13:1	16:1
2016	13:1	14:1	16:1
2015	12:1	14:1	15:1
2014	13:1	14:1	17:1
2013	14:1	14:1	17:1
2012	14:1	14:1	17:1
2011	14:1	14:1	16:1
2010	15:1	13:1	16:1
2009	14:1	13:1	15:1
2008	15:1	13:1	18:1
2007	15:1	15:1	19:1
2006	15:1	14:1	17:1
2005	15:1	14:1	16:1
2004	15:1	14:1	16:1
2003	16:1	14:1	16:1
2002	16:1	14:1	17:1
2001	16:1	14:1	17:1
2000	16:1	14:1	15:1
1999	16:1	15:1	15:1
1998	17:1	15:1	16:1
1997	17:1	15:1	16:1
1996	17:1	15:1	17:1
1995	17:1	15:1	17:1
1994	17:1	16:1	17:1
1993	17:1	16:1	18:1
1992	17:1	16:1	18:1
1991	18:1	16:1	19:1
1990	22:1	16:1	20:1
1989	22:1	16:1	20:1
1988	22:1	16:1	21:1
1987	19:1	17:1	19:1

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American Indian

n/a

Asian

View Data

Asian Student Percentage Comparison Over Years (1999-2023)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2023	4%	2%	4%
2022	4%	2%	5%
2021	5%	2%	4%
2020	5%	2%	5%
2019	5%	2%	5%
2018	5%	2%	4%
2017	5%	2%	4%
2016	4%	3%	4%
2015	4%	2%	4%
2014	4%	3%	4%
2013	4%	2%	4%
2012	5%	2%	4%
2011	3%	2%	5%
2010	2%	2%	4%
2009	2%	2%	3%
2008	2%	2%	3%
2007	1%	3%	2%
2006	1%	2%	2%
2005	1%	2%	2%
2004	1%	1%	3%
2003	1%	2%	2%
2002	2%	1%	2%
2001	2%	2%	1%
2000	1%	1%	1%
1999	1%	1%	1%

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Hispanic

View Data

Hispanic Student Percentage Comparison Over Years (1999-2023)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2023	6%	8%	6%
2022	7%	8%	6%
2021	5%	7%	5%
2020	5%	7%	4%
2019	5%	7%	4%
2018	6%	6%	4%
2017	6%	6%	4%
2016	4%	6%	3%
2015	3%	6%	3%
2014	4%	6%	3%
2013	3%	5%	3%
2012	2%	5%	3%
2011	2%	5%	2%
2010	2%	4%	2%
2009	1%	4%	2%
2008	2%	4%	2%
2007	1%	3%	2%
2006	1%	3%	2%
2005	1%	3%	1%
2004	1%	3%	1%
2003	2%	2%	1%
2002	2%	2%	1%
2001	1%	2%	1%
2000	1%	2%	1%
1999	1%	1%	1%

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Black

15%

View Data

Black Student Percentage Comparison Over Years (1996-2023)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2023	5%	15%	8%
2022	4%	15%	7%
2021	5%	15%	7%
2020	4%	16%	7%
2019	4%	16%	7%
2018	4%	16%	8%
2017	4%	16%	8%
2016	4%	16%	8%
2015	3%	16%	7%
2014	5%	16%	9%
2013	5%	17%	7%
2012	5%	17%	7%
2011	5%	17%	6%
2010	3%	18%	6%
2009	2%	18%	6%
2008	3%	18%	5%
2007	3%	18%	5%
2006	4%	18%	5%
2005	3%	18%	5%
2004	4%	18%	4%
2003	4%	18%	4%
2002	3%	18%	4%
2001	3%	17%	3%
2000	3%	17%	3%
1999	2%	17%	3%
1998	2%	17%	3%
1997	2%	17%	5%
1996	3%	16%	3%

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White

77%

68%

View Data

White Student Percentage Comparison Over Years (1993-2023)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2023	79%	69%	76%
2022	80%	69%	77%
2021	81%	70%	79%
2020	81%	71%	80%
2019	81%	71%	80%
2018	82%	72%	81%
2017	82%	72%	81%
2016	83%	72%	82%
2015	86%	73%	84%
2014	83%	73%	83%
2013	86%	74%	85%
2012	87%	74%	86%
2011	90%	75%	87%
2010	93%	76%	88%
2009	94%	76%	89%
2008	93%	76%	90%
2007	94%	76%	91%
2006	94%	77%	91%
2005	94%	77%	92%
2004	94%	78%	92%
2003	92%	78%	93%
2002	93%	79%	93%
2001	94%	79%	94%
2000	94%	80%	93%
1999	96%	81%	94%
1998	96%	81%	96%
1997	96%	81%	94%
1996	97%	82%	95%
1995	98%	82%	97%
1994	93%	82%	97%
1993	100%	83%	98%

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Hawaiian

n/a

Two or more races

View Data

Two or More Races Student Percentage Comparison Over Years (2013-2023)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2023	6%	6%	6%
2022	5%	5%	5%
2021	4%	5%	5%
2020	4%	4%	4%
2019	4%	4%	4%
2018	3%	4%	3%
2017	3%	4%	3%
2016	5%	3%	3%
2015	4%	3%	2%
2014	4%	2%	1%
2013	2%	2%	1%

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All Ethnic Groups

0.40

0.51

View Data

Diversity Score Comparison Over Years (1996-2023)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2023	0.37	0.50	0.41
2022	0.35	0.50	0.40
2021	0.34	0.48	0.37
2020	0.34	0.47	0.36
2019	0.34	0.47	0.36
2018	0.32	0.45	0.34
2017	0.32	0.45	0.34
2016	0.31	0.46	0.32
2015	0.26	0.44	0.30
2014	0.31	0.44	0.31
2013	0.26	0.42	0.27
2012	0.24	0.42	0.25
2011	0.19	0.41	0.23
2010	0.13	0.39	0.22
2009	0.12	0.39	0.20
2008	0.13	0.39	0.19
2007	0.12	0.39	0.17
2006	0.12	0.37	0.17
2005	0.12	0.38	0.15
2004	0.12	0.36	0.14
2003	0.14	0.36	0.13
2002	0.13	0.35	0.14
2001	0.12	0.35	0.11
2000	0.12	0.33	0.12
1999	0.08	0.32	0.09
1998	0.08	0.31	0.08
1997	0.07	0.31	0.12
1996	0.06	0.30	0.08

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Eligible for

42%

View Data

Free Lunch Eligibility Comparison Over Years (1993-2023)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2023	9%	41%	12%
2022	11%	40%	12%
2021	13%	43%	14%
2020	12%	44%	13%
2019	12%	44%	13%
2018	12%	44%	14%
2017	12%	44%	14%
2016	14%	44%	14%
2015	13%	44%	14%
2014	17%	42%	16%
2013	14%	38%	13%
2012	13%	38%	12%
2011	12%	37%	11%
2010	10%	36%	10%
2009	9%	31%	9%
2008	8%	32%	7%
2007	8%	31%	6%
2006	9%	32%	7%
2005	7%	32%	7%
2004	7%	30%	6%
2003	7%	29%	4%
2002	4%	28%	4%
2001	5%	28%	4%
2000	4%	28%	3%
1999	4%	27%	4%
1998	5%	28%	4%
1997	5%	28%	4%
1996	8%	28%	6%
1995	5%	29%	5%
1994	8%	26%	7%
1993	6%	21%	6%

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Eligible for

View Data

Reduced-Price Lunch Eligibility Comparison Over Years (1999-2023)
Year	Castlio Elementary School	Missouri	Francis Howell R-III School District
2023	3%	7%	3%
2022	2%	5%	2%
2021	2%	6%	3%
2020	2%	6%	3%
2019	2%	6%	3%
2018	2%	6%	2%
2017	2%	6%	2%
2016	2%	6%	2%
2015	3%	7%	2%
2014	3%	7%	3%
2013	2%	7%	3%
2012	4%	7%	3%
2011	4%	7%	3%
2010	4%	8%	3%
2009	3%	8%	2%
2008	4%	8%	2%
2007	3%	8%	2%
2006	2%	8%	2%
2005	2%	7%	2%
2004	2%	7%	2%
2003	1%	7%	2%
2002	2%	7%	2%
2001	2%	7%	2%
2000	3%	7%	2%
1999	2%	6%	2%

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School Statewide Testing

School District Name

Francis Howell R-III School District

Source: National Center for Education Statistics (NCES), MO Dept. of Education

<�鶹��ý class='so-dt-title' id="school-notes">School Notes

School Mascot: Cougars

Profile last updated: 02/09/2025

<�鶹��ý class='so-dt-title' id='faq'>Frequently Asked Questions

What is Castlio Elementary School's ranking?

Castlio Elementary School is ranked #169 out of 2,076 schools, which ranks it among the top 10% of public schools in Missouri.

What schools are Castlio Elementary School often compared to?

Castlio Elementary Schoolis often viewed alongside schools like Becky-david Elementary School by visitors of our site.

What percent of students have achieved state testing proficiency in math and reading?

61% of students have achieved math proficiency (compared to the 40% MO state average), while 63% of students have achieved reading proficiency (compared to the 43% MO state average).

How many students attend Castlio Elementary School?

838 students attend Castlio Elementary School.

What is the racial composition of the student body?

77% of Castlio Elementary School students are White, 7% of students are Hispanic, 6% of students are Asian, 6% of students are Two or more races, and 4% of students are Black.

What is the student-teacher ratio of Castlio Elementary School?

Castlio Elementary School has a student ration of 13:1, which is higher than the Missouri state average of 12:1.

What grades does Castlio Elementary School offer ?

Castlio Elementary School offers enrollment in grades Kindergarten-5 (No virtual instruction).

What school district is Castlio Elementary School part of?

Castlio Elementary School is part of Francis Howell R-III School District.

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Quick Facts (2026)

Grades: Kindergarten-5
Enrollment: 838 students
Student-Teacher Ratio: 13:1
Minority Enrollment: 23%
: Top 10%
: 61% (Top 20%)
: 63% (Top 10%)
: 55-59% (Top 10%)
Source: National Center for Education Statistics (NCES), MO Dept. of Education