Mary Lou Cowlishaw Elementary School (Ranked Top 30% for 2025)

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Mary Lou Cowlishaw Elementary School

1212 Sanctuary Ln
Naperville, IL 60540

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Top 30%

Serving 564 students in grades Kindergarten-5, Mary Lou Cowlishaw Elementary School ranks in the top 30% of all schools in Illinois for overall test scores (math proficiency is top 30%, and reading proficiency is top 30%).

The percentage of students achieving is 40% (which is higher than the Illinois state average of 27%). The percentage of students achieving is 42% (which is higher than the Illinois state average of 30%).

The student:teacher ratio of 13:1 is equal to the Illinois state level of 13:1.

Minority enrollment is 79% of the student body (majority Asian), which is higher than the Illinois state average of 55% (majority Hispanic and Black).

Quick Stats (2025)

Grades: Kindergarten-5
Enrollment: 564 students
Student:Teacher Ratio: 13:1
Minority Enrollment: 79%
: Top 30% in IL
: 40% (Top 30%)
: 42% (Top 30%)
: 55-59% (Top 50%)
Source: National Center for Education Statistics (NCES), IL Dept. of Education

Top Rankings

Mary Lou Cowlishaw Elementary School ranks among the top 20% of public schools in Illinois for:

School Overview

Mary Lou Cowlishaw Elementary School's student population of 564 students has declined by 19% over five school years.

The teacher population of 44 teachers has stayed relatively flat over five school years.

Grades Offered

Grades Kindergarten-5

View Data

Distribution of Students By Grade Trends
Grade	Mary Lou Cowlishaw Elementary School
Kind	80
1	93
2	106
3	92
4	98
5	95

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Total Students

564 students

View Data

Total Students Trends Over Years (1999-2023)
Year	Mary Lou Cowlishaw Elementary School
2023	548
2022	602
2021	674
2020	697
2019	697
2018	649
2017	649
2016	637
2015	627
2014	651
2013	763
2012	722
2011	731
2010	732
2009	673
2008	595
2007	604
2006	606
2005	611
2004	602
2003	764
2002	770
2001	731
2000	632
1999	657

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Gender %

Total Classroom Teachers

44 teachers

View Data

Total Classroom Teachers Trends Over Years (1998-2023)
Year	Mary Lou Cowlishaw Elementary School
2023	44
2022	47
2020	42
2019	42
2018	42
2017	42
2016	41
2015	40
2014	42
2013	46
2012	46
2011	46
2010	47
2009	42
2008	33
2007	32
2006	29
2005	32
2004	37
2003	45
2002	46
2001	41
2000	30
1999	35
1998	26

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School Rankings

Mary Lou Cowlishaw Elementary School ranks within the top 30% of all 3,542 schools in Illinois (based off of combined math and reading proficiency testing data).

The of Mary Lou Cowlishaw Elementary School is 0.72, which is more than the diversity score at state average of 0.70. The school's diversity has stayed relatively flat over five school years.

This School

State Level (IL)

#731 out of 3542 schools
(Top 30%)

View Data

Overall School Rank Trends Over Years (2012-2023)
Year	Mary Lou Cowlishaw Elementary School
2023	#731
2022	#531
2021	#836
2019	#846
2018	#735
2017	#488
2016	#399
2015	#625
2014	#306
2013	#367
2012	#886

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40%

27%

View Data

Math Proficiency Comparison Over Years (2011-2023)
Year	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2023	40%	27%	50%
2021	45%	28%	47%
2019	46%	33%	57%
2018	51%	32%	56%
2017	51%	32%	58%
2016	53%	31%	57%
2015	49%	29%	58%
2014	85%	59%	82%
2013	79%	58%	78%
2012	91%	80%	92%
2011	93%	80%	92%

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42%

30%

View Data

Reading and Language Arts Proficiency Comparison Over Years (2011-2022)
Year	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2022	42%	30%	50%
2021	35%	32%	47%
2019	49%	38%	59%
2018	48%	37%	56%
2017	57%	38%	59%
2016	58%	36%	57%
2015	48%	38%	59%
2014	77%	57%	77%
2013	80%	58%	78%
2012	90%	75%	89%
2011	89%	75%	89%

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55-59%

50%

Student : Teacher Ratio

13:1

View Data

Student-Teacher Ratio Comparison Over Years (1998-2023)
Year	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2023	12:1	14:1	14:1
2022	13:1	14:1	15:1
2020	17:1	15:1	15:1
2019	17:1	15:1	15:1
2018	15:1	16:1	16:1
2017	15:1	15:1	16:1
2016	16:1	16:1	16:1
2015	16:1	16:1	16:1
2014	16:1	16:1	17:1
2013	17:1	13:1	17:1
2012	16:1	16:1	17:1
2011	16:1	16:1	17:1
2010	16:1	16:1	16:1
2009	16:1	16:1	16:1
2008	18:1	18:1	19:1
2007	19:1	17:1	18:1
2006	21:1	16:1	18:1
2005	19:1	16:1	17:1
2004	16:1	17:1	17:1
2003	17:1	16:1	16:1
2002	17:1	16:1	15:1
2001	18:1	16:1	16:1
2000	21:1	16:1	17:1
1999	19:1	16:1	17:1
1998	21:1	17:1	18:1

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American Indian

n/a

Asian

43%

View Data

Asian Student Percentage Comparison Over Years (1999-2023)
Year	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2023	44%	6%	37%
2022	48%	5%	36%
2021	48%	5%	35%
2020	45%	5%	32%
2019	45%	5%	32%
2018	40%	5%	28%
2017	40%	5%	28%
2016	36%	5%	27%
2015	35%	6%	25%
2014	34%	5%	23%
2013	32%	5%	22%
2012	32%	4%	21%
2011	32%	5%	19%
2010	32%	5%	21%
2009	32%	5%	20%
2008	31%	5%	18%
2007	31%	5%	17%
2006	30%	5%	16%
2005	29%	5%	14%
2004	29%	4%	12%
2003	28%	4%	12%
2002	26%	4%	11%
2001	22%	4%	9%
2000	20%	3%	8%
1999	17%	3%	7%

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Hispanic

20%

28%

View Data

Hispanic Student Percentage Comparison Over Years (1999-2023)
Year	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2023	20%	27%	13%
2022	14%	27%	13%
2021	13%	27%	13%
2020	13%	26%	12%
2019	13%	26%	12%
2018	15%	26%	11%
2017	15%	26%	11%
2016	17%	26%	11%
2015	18%	25%	11%
2014	15%	25%	11%
2013	17%	24%	10%
2012	15%	24%	10%
2011	14%	23%	10%
2010	12%	22%	8%
2009	12%	22%	8%
2008	12%	21%	8%
2007	12%	20%	8%
2006	10%	19%	7%
2005	9%	18%	7%
2004	8%	18%	6%
2003	5%	17%	5%
2002	6%	16%	5%
2001	6%	15%	4%
2000	5%	15%	4%
1999	5%	14%	4%

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Black

12%

16%

View Data

Black Student Percentage Comparison Over Years (1999-2023)
Year	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2023	11%	17%	9%
2022	11%	17%	9%
2021	11%	17%	9%
2020	13%	17%	9%
2019	13%	17%	9%
2018	11%	17%	9%
2017	11%	17%	9%
2016	15%	17%	9%
2015	13%	17%	9%
2014	15%	17%	9%
2013	15%	18%	9%
2012	17%	18%	9%
2011	16%	18%	9%
2010	19%	20%	10%
2009	19%	20%	10%
2008	17%	20%	10%
2007	16%	20%	9%
2006	16%	20%	9%
2005	15%	20%	9%
2004	16%	21%	9%
2003	6%	21%	8%
2002	5%	21%	7%
2001	5%	21%	7%
2000	4%	21%	7%
1999	5%	21%	7%

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White

21%

45%

View Data

White Student Percentage Comparison Over Years (1999-2023)
Year	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2023	19%	45%	35%
2022	22%	47%	36%
2021	22%	47%	38%
2020	23%	48%	43%
2019	23%	48%	43%
2018	30%	49%	48%
2017	30%	49%	48%
2016	28%	49%	49%
2015	30%	49%	51%
2014	31%	50%	53%
2013	32%	50%	55%
2012	32%	51%	56%
2011	32%	51%	58%
2010	37%	53%	61%
2009	37%	53%	62%
2008	40%	54%	64%
2007	41%	55%	66%
2006	44%	56%	68%
2005	47%	57%	70%
2004	47%	57%	73%
2003	61%	58%	75%
2002	63%	59%	77%
2001	67%	60%	80%
2000	71%	61%	81%
1999	73%	62%	82%

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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	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2023	6%	4%	6%
2022	5%	4%	6%
2021	6%	4%	5%
2020	6%	4%	4%
2019	6%	4%	4%
2018	4%	3%	4%
2017	4%	3%	4%
2016	4%	3%	4%
2015	4%	3%	4%
2014	5%	3%	4%
2013	4%	3%	4%

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All Ethnic Groups

0.72

0.70

View Data

Diversity Score Comparison Over Years (1999-2023)
Year	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2023	0.72	0.70	0.72
2022	0.69	0.68	0.72
2021	0.70	0.68	0.71
2020	0.71	0.68	0.70
2019	0.71	0.68	0.70
2018	0.72	0.67	0.68
2017	0.72	0.67	0.68
2016	0.75	0.67	0.67
2015	0.74	0.67	0.66
2014	0.75	0.66	0.65
2013	0.76	0.66	0.64
2012	0.75	0.65	0.63
2011	0.75	0.66	0.62
2010	0.74	0.64	0.57
2009	0.74	0.64	0.56
2008	0.73	0.64	0.54
2007	0.73	0.63	0.52
2006	0.71	0.61	0.50
2005	0.69	0.61	0.47
2004	0.68	0.60	0.44
2003	0.55	0.59	0.41
2002	0.53	0.59	0.39
2001	0.50	0.58	0.35
2000	0.46	0.57	0.34
1999	0.44	0.56	0.31

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Eligible for

24%

43%

View Data

Free Lunch Eligibility Comparison Over Years (2011-2023)
Year	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2023	25%	43%	14%
2022	23%	43%	14%
2021	20%	44%	14%
2020	27%	47%	16%
2019	27%	47%	16%
2018	21%	46%	13%
2017	21%	46%	13%
2016	28%	47%	14%
2015	30%	52%	16%
2014	30%	47%	17%
2013	25%	45%	13%
2012	11%	21%	4%
2011	19%	39%	11%

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Eligible for

View Data

Reduced-Price Lunch Eligibility Comparison Over Years (2011-2023)
Year	Mary Lou Cowlishaw Elementary School	Illinois	Indian Prairie CUSD 204 School District
2023	6%	4%	3%
2022	5%	4%	3%
2021	5%	4%	3%
2018	5%	4%	3%
2017	5%	4%	3%
2016	1%	3%
2015	5%	2%	2%
2014	2%	3%	1%
2013	10%	5%	6%
2012	17%	27%	10%
2011	4%	5%	2%

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School Statewide Testing

School District Name

Indian Prairie CUSD 204 School District

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

Profile last updated: 02/09/2025

Frequently Asked Questions

What is Mary Lou Cowlishaw Elementary School's ranking?

Mary Lou Cowlishaw Elementary School is ranked #731 out of 3,542 schools, which ranks it among the top 30% of public schools in Illinois.

What schools are Mary Lou Cowlishaw Elementary School often compared to?

Mary Lou Cowlishaw Elementary Schoolis often viewed alongside schools like May Watts Elementary School by visitors of our site.

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

40% of students have achieved math proficiency (compared to the 27% IL state average), while 42% of students have achieved reading proficiency (compared to the 30% IL state average).

How many students attend Mary Lou Cowlishaw Elementary School?

564 students attend Mary Lou Cowlishaw Elementary School.

What is the racial composition of the student body?

43% of Mary Lou Cowlishaw Elementary School students are Asian, 21% of students are White, 20% of students are Hispanic, 12% of students are Black, and 4% of students are Two or more races.

What is the student:teacher ratio of Mary Lou Cowlishaw Elementary School?

Mary Lou Cowlishaw Elementary School has a student ration of 13:1, which is equal to the Illinois state average of 13:1.

What grades does Mary Lou Cowlishaw Elementary School offer ?

Mary Lou Cowlishaw Elementary School offers enrollment in grades Kindergarten-5

What school district is Mary Lou Cowlishaw Elementary School part of?

Mary Lou Cowlishaw Elementary School is part of Indian Prairie CUSD 204 School District.

In what neighborhood is Mary Lou Cowlishaw Elementary School located?

Mary Lou Cowlishaw Elementary School is located in the Naperville Park District neighborhood of Naperville, IL. There are 35 other public schools located in Naperville Park District.

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Quick Stats (2025)

Grades: Kindergarten-5
Enrollment: 564 students
Student:Teacher Ratio: 13:1
Minority Enrollment: 79%
: Top 30%
: 40% (Top 30%)
: 42% (Top 30%)
: 55-59% (Top 50%)
Source: National Center for Education Statistics (NCES), IL Dept. of Education