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 proficiency in math is 75-79% (which is higher than the Arizona state average of 34%). The percentage of students achieving proficiency in reading/language arts 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%
- Overall Testing Rank: Top 5% in AZ
- Math Proficiency: 75-79% (Top 5%)
- Reading Proficiency: 75-79% (Top 5%)
- Science Proficiency: ≤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:
Category
Attribute
Overall Rank
Math Proficiency
Reading/Language Arts Proficiency
Student Attention
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)
(No virtual instruction)
Total Students
123 students
Total Classroom Teachers
13 teachers
Year Founded
1948
School Calendar
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 diversity score 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.
Overall Testing Rank
#40 out of 1921 schools
(Top 5%)
(Top 5%)
Math Test Scores (% Proficient)
75-79%
34%
Reading/Language Arts Test Scores (% Proficient)
75-79%
40%
Science Test Scores (% Proficient)
≤20%
24%
Student-Teacher Ratio
9:1
17:1
American Indian
2%
5%
Asian
n/a
3%
Hispanic
53%
49%
Black
1%
6%
White
37%
33%
Hawaiian
n/a
n/a
Two or more races
7%
4%
All Ethnic Groups
Eligible for Free Lunch (22-23)
52%
39%
Eligible for Reduced Lunch
93%
10%
School Statewide Testing
School District Name
Mary C O'brien Accommodation District (4435)
Source: National Center for Education Statistics (NCES), AZ Dept. of Education
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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