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Mary C O'brien Elementary School

1400 N Eleven Mile Corner Rd
Casa Grande, AZ 85122

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10/

Top 5%

Tel: (520) 450-4400

www.pinalk12.org

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Serving 123 students in grades Kindergarten-6, Mary C O'brien Elementary School ranks in the top 5% of all schools in Arizona for overall test scores (math proficiency is top 5%, and reading proficiency is top 5%).

The percentage of students achieving is 75-79% (which is higher than the Arizona state average of 34%). The percentage of students achieving is 75-79% (which is higher than the Arizona state average of 40%).

The student-teacher ratio of 9:1 is lower than the Arizona state level of 17:1.

Minority enrollment is 63% of the student body (majority Hispanic), which is lower than the Arizona state average of 67% (majority Hispanic).

Quick Facts (2026)

Grades: Kindergarten-6
Enrollment: 123 students
Student-Teacher Ratio: 9:1
Minority Enrollment: 63%
: Top 5% in AZ
: 75-79% (Top 5%)
: 75-79% (Top 5%)
: ≤20% (Btm 50%)
Source: National Center for Education Statistics (NCES), AZ Dept. of Education

Top Rankings

Mary C O'brien Elementary School ranks among the top 20% of public schools in Arizona for:

School Overview

Mary C O'brien Elementary School's student population of 123 students has grown by 5% over five school years.

The teacher population of 13 teachers has grown by 8% over five school years.

Grades Offered

Grades Kindergarten-6
(No virtual instruction)

View Data

Distribution of Students By Grade Trends
Grade	Mary C O'brien Elementary School
Kind	20
1	16
2	20
3	17
4	17
5	17
6	16

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Total Students

123 students

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Total Students Trends Over Years (1989-2025)
Year	Mary C O'brien Elementary School
2025	123
2024	122
2023	120
2022	118
2021	117
2020	125
2019	126
2018	117
2017	117
2016	118
2015	123
2014	116
2013	119
2012	125
2011	129
2010	121
2009	119
2008	122
2007	119
2006	115
2005	125
2004	111
2003	101
2002	108
2001	94
2000	84
1999	60
1998	69
1997	61
1996	73
1995	60
1994	73
1993	61
1992	88
1991	84
1990	62
1989	74

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Total Classroom Teachers

13 teachers

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Total Classroom Teachers Trends Over Years (1989-2025)
Year	Mary C O'brien Elementary School
2025	13
2024	14
2023	12
2022	12
2021	12
2020	11
2019	11
2018	11
2017	11
2016	11
2015	12
2014	12
2013	11
2012	11
2011	10
2010	10
2009	11
2008	10
2007	10
2006	10
2005	10
2004	9
2003	9
2002	8
2001	6
2000	5
1999	4
1998	5
1997	6
1996	5
1995	5
1994	4
1993	4
1992	4
1991	4
1990	3
1989	3

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Year Founded

1948

Colors

Blue and Gold

School Calendar

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School Rankings

Mary C O'brien Elementary School ranks within the top 5% of all 1,921 schools in Arizona (based off of combined math and reading proficiency testing data).

The of Mary C O'brien Elementary School is 0.58, which is less than the diversity score at state average of 0.66. The school's diversity has stayed relatively flat over five school years.

This School

State Level (AZ)

#40 out of 1921 schools
(Top 5%)

View Data

Overall School Rank Trends Over Years (2012-2023)
Year	Mary C O'brien Elementary School
2023	#40
2022	#56
2021	#85
2019	#72
2018	#90
2017	#66
2016	#216
2015	#375
2014	#251
2013	#357
2012	#330

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75-79%

34%

View Data

Math Proficiency Comparison Over Years (2012-2023)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2023	77%	34%	77%
2022	72%	35%	62%
2021	64%	32%	57%
2019	82%	45%	57%
2018	82%	45%	62%
2017	77%	42%	57%
2016	57%	39%	42%
2015	47%	38%	37%
2014	84%	63%	72%
2013	74%	63%	62%
2012	74%	63%	67%

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75-79%

40%

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Reading and Language Arts Proficiency Comparison Over Years (2011-2022)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2022	77%	40%	67%
2021	74%	39%	62%
2019	77%	45%	62%
2018	72%	44%	62%
2017	77%	42%	57%
2016	67%	40%	52%
2015	57%	38%	47%
2014	90%	79%	87%
2013	90%	78%	82%
2012	90%	77%	77%
2011	87%	77%	82%

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≤20%

24%

Student-Teacher Ratio

9:1

17:1

View Data

Student-Teacher Ratio Comparison Over Years (1989-2025)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2025	9:1	17:1
2024	9:1	18:1	8:1
2023	10:1	18:1	9:1
2022	10:1	18:1	10:1
2021	10:1	17:1	8:1
2020	11:1	19:1	12:1
2019	11:1	19:1	12:1
2018	11:1	19:1	11:1
2017	11:1	19:1	11:1
2016	11:1	19:1	10:1
2015	10:1	19:1	10:1
2014	10:1	19:1	10:1
2013	11:1	19:1	10:1
2012	12:1	19:1	11:1
2011	13:1	19:1	14:1
2010	12:1	18:1	13:1
2009	11:1	18:1	12:1
2008	12:1	18:1	14:1
2007	12:1	19:1	13:1
2006	12:1	19:1	12:1
2005	13:1	19:1	14:1
2004	12:1	19:1	12:1
2003	11:1	19:1	11:1
2002	14:1	19:1	13:1
2001	16:1	19:1	13:1
2000	17:1	19:1	13:1
1999	15:1	19:1	11:1
1998	15:1	19:1	10:1
1997	10:1	19:1	10:1
1996	16:1	19:1	15:1
1995	12:1	19:1	12:1
1994	18:1	20:1	18:1
1993	15:1	20:1	15:1
1992	22:1	20:1	22:1
1991	21:1	20:1	21:1
1990	21:1	20:1	21:1
1989	25:1	20:1	25:1

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American Indian

View Data

American Indian Student Percentage Comparison Over Years (1991-2021)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2021	3%	5%	3%
2020	4%	6%	1%
2019	2%	6%	1%
2018	3%	6%	3%
2017	3%	6%	3%
2016	2%	5%	2%
2015	4%	5%	4%
2014	1%	5%	2%
2013	1%	5%	1%
2012	1%	5%	2%
2011	2%	7%	3%
2010	2%	6%	6%
2009	3%	6%	6%
2008	2%	5%	4%
2007	4%	6%	6%
2006	6%	7%	8%
2005	4%	7%	8%
2004	7%	8%	8%
2003	7%	8%	7%
2002	4%	8%	8%
2001	4%	8%	8%
2000	3%	8%	9%
1999	2%	7%	13%
1998	2%	7%	9%
1997	2%	7%	2%
1996	4%	7%	4%
1995	6%	7%	6%
1994	6%	7%	6%
1993	10%	7%	10%
1992	1%	8%	1%
1991	3%	6%	4%

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Hispanic

53%

49%

View Data

Hispanic Student Percentage Comparison Over Years (1988-2024)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2024	53%	48%	69%
2023	52%	47%	68%
2022	49%	47%	64%
2021	51%	46%	63%
2020	45%	45%	67%
2019	55%	45%	67%
2018	61%	45%	70%
2017	61%	45%	70%
2016	63%	45%	68%
2015	65%	45%	65%
2014	71%	44%	77%
2013	68%	43%	74%
2012	74%	43%	76%
2011	69%	42%	70%
2010	49%	41%	60%
2009	52%	41%	58%
2008	52%	42%	60%
2007	50%	41%	59%
2006	58%	39%	69%
2005	65%	38%	66%
2004	64%	37%	69%
2003	60%	36%	61%
2002	72%	35%	68%
2001	72%	33%	61%
2000	77%	33%	69%
1999	73%	32%	63%
1998	75%	31%	64%
1997	72%	30%	72%
1996	64%	30%	64%
1995	48%	29%	48%
1994	56%	28%	56%
1993	59%	27%	59%
1992	69%	25%	69%
1991	48%	25%	49%
1990	85%	24%	84%
1989	38%	22%	39%
1988	68%	23%	67%

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Black

View Data

Black Student Percentage Comparison Over Years (1993-2024)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2024	2%	6%	2%
2023	2%	6%	2%
2022	1%	6%	2%
2021	2%	6%	2%
2020	2%	5%	3%
2019	1%	5%	3%
2018	1%	5%	1%
2017	1%	5%	1%
2016	3%	5%	3%
2015	2%	5%	6%
2014	3%	5%	5%
2013	4%	5%	5%
2012	3%	5%	6%
2011	2%	5%	7%
2010	4%	6%	7%
2009	4%	6%	7%
2008	5%	6%	7%
2007	5%	5%	5%
2006	5%	5%	4%
2005	8%	5%	8%
2004	5%	5%	5%
2003	7%	5%	8%
2002	6%	5%	6%
2001	3%	5%	6%
1999	5%	5%	4%
1998	3%	4%	6%
1997	5%	4%	5%
1996	7%	4%	7%
1995	13%	4%	13%
1994	11%	4%	11%
1993	1%	4%	1%

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White

37%

33%

View Data

White Student Percentage Comparison Over Years (1988-2024)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2024	30%	34%	19%
2023	34%	35%	22%
2022	37%	35%	24%
2021	33%	36%	25%
2020	42%	38%	25%
2019	35%	38%	25%
2018	32%	38%	24%
2017	32%	38%	24%
2016	28%	39%	24%
2015	27%	40%	23%
2014	22%	41%	14%
2013	24%	42%	18%
2012	22%	42%	16%
2011	27%	42%	19%
2010	45%	44%	27%
2009	40%	44%	28%
2008	39%	44%	27%
2007	39%	45%	28%
2006	31%	47%	22%
2005	23%	48%	18%
2004	24%	48%	18%
2003	26%	49%	24%
2002	18%	50%	18%
2001	21%	52%	25%
2000	20%	53%	21%
1999	20%	54%	20%
1998	20%	56%	21%
1997	21%	57%	21%
1996	25%	57%	25%
1995	33%	58%	33%
1994	27%	59%	27%
1993	30%	60%	30%
1992	24%	61%	24%
1991	19%	65%	20%
1990	27%	66%	26%
1989	22%	67%	23%
1988	39%	67%	38%

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Two or more races

View Data

Two or More Races Student Percentage Comparison Over Years (2014-2024)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2024	12%	4%	7%
2023	9%	4%	6%
2022	9%	4%	5%
2021	8%	4%	5%
2020	5%	3%	2%
2019	4%	3%	2%
2018	2%	3%	1%
2017	2%	3%	1%
2016	3%	3%	2%
2015	1%	2%	1%
2014	2%	2%	1%

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All Ethnic Groups

0.58

0.66

View Data

Diversity Score Comparison Over Years (1989-2025)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2025	0.58	0.65
2024	0.62	0.65	0.49
2023	0.61	0.65	0.49
2022	0.62	0.65	0.53
2021	0.63	0.66	0.54
2020	0.63	0.65	0.49
2019	0.58	0.65	0.49
2018	0.53	0.65	0.45
2017	0.53	0.65	0.45
2016	0.53	0.65	0.48
2015	0.51	0.64	0.52
2014	0.46	0.64	0.39
2013	0.48	0.64	0.43
2012	0.42	0.64	0.41
2011	0.46	0.65	0.47
2010	0.56	0.64	0.56
2009	0.57	0.64	0.58
2008	0.58	0.63	0.56
2007	0.60	0.63	0.57
2006	0.57	0.63	0.54
2005	0.52	0.62	0.53
2004	0.53	0.63	0.48
2003	0.57	0.63	0.56
2002	0.45	0.62	0.50
2001	0.44	0.62	0.56
2000	0.37	0.62	0.48
1999	0.43	0.60	0.55
1998	0.40	0.59	0.54
1997	0.44	0.58	0.44
1996	0.53	0.58	0.53
1995	0.65	0.58	0.65
1994	0.60	0.57	0.60
1993	0.57	0.56	0.56
1992	0.47	0.56	0.47
1991	0.69	0.54	0.53
1990	0.47	0.53	0.46
1989	0.69	0.51	0.48

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Eligible for (22-23)

52%

39%

View Data

Free Lunch Eligibility Comparison Over Years (2005-2023)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2023	52%	39%	55%
2022	52%	29%	56%
2020	52%	43%
2010	2%	38%	2%
2007	50%	32%	54%
2006	97%	37%	98%
2005	95%	40%	95%

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Eligible for

93%

10%

View Data

Reduced-Price Lunch Eligibility Comparison Over Years (2008-2025)
Year	Mary C O'brien Elementary School	Arizona	Mary C O'brien Accommodation District (4435)
2025	93%	10%
2024	93%	10%	96%
2023	10%	7%	11%
2022	9%	2%	10%
2021	97%	9%	98%
2020	10%	7%	89%
2019	90%	7%	89%
2018	97%	9%	97%
2017	97%	9%	97%
2016	97%	11%	97%
2014	97%	14%	97%
2013	97%	10%	97%
2012	98%	11%	98%
2011	98%	10%	98%
2010	96%	8%	96%
2009	97%	10%	96%
2008	98%	9%	98%

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School Statewide Testing

View Education Department Test Scores

School District Name

Mary C O'brien Accommodation District (4435)

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

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Frequently Asked Questions

What is Mary C O'brien Elementary School's ranking?

Mary C O'brien Elementary School is ranked #40 out of 1,921 schools, which ranks it among the top 5% of public schools in Arizona.

What schools are Mary C O'brien Elementary School often compared to?

Mary C O'brien Elementary Schoolis often viewed alongside schools like Legacy Traditional School - Casa Grande by visitors of our site.

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

75-79% of students have achieved math proficiency (compared to the 34% AZ state average), while 75-79% of students have achieved reading proficiency (compared to the 40% AZ state average).

How many students attend Mary C O'brien Elementary School?

123 students attend Mary C O'brien Elementary School.

What is the racial composition of the student body?

53% of Mary C O'brien Elementary School students are Hispanic, 37% of students are White, 7% of students are Two or more races, 2% of students are American Indian, and 1% of students are Black.

What is the student-teacher ratio of Mary C O'brien Elementary School?

Mary C O'brien Elementary School has a student ration of 9:1, which is lower than the Arizona state average of 17:1.

What grades does Mary C O'brien Elementary School offer ?

Mary C O'brien Elementary School offers enrollment in grades Kindergarten-6 (No virtual instruction).

What school district is Mary C O'brien Elementary School part of?

Mary C O'brien Elementary School is part of Mary C O'brien Accommodation District (4435).

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Quick Facts (2026)

Grades: Kindergarten-6
Enrollment: 123 students
Student-Teacher Ratio: 9:1
Minority Enrollment: 63%
: Top 5%
: 75-79% (Top 5%)
: 75-79% (Top 5%)
: ≤20% (Btm 50%)
Source: National Center for Education Statistics (NCES), AZ Dept. of Education

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