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Public School Review - Established 2003

J. Marion Roynon Elementary School

2715 E St.
San Dimas, CA 91773
(School attendance zone shown in map)
View full size Get directions
: 
9/
10
Top 20%
Tel: (909) 971-8207
ro.bonita.k12.ca.us
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Serving 842 students in grades Kindergarten-5, J. Marion Roynon Elementary School ranks in the top 20% of all schools in California for overall test scores (math proficiency is top 20%, and reading proficiency is top 20%).
The percentage of students achieving proficiency in math is 61% (which is higher than the California state average of 34%). The percentage of students achieving proficiency in reading/language arts is 62% (which is higher than the California state average of 47%).
The student-teacher ratio of 25:1 is higher than the California state level of 21:1.
Minority enrollment is 84% of the student body (majority Hispanic), which is higher than the California state average of 80% (majority Hispanic).

Quick Facts (2026)

  • Grades: Kindergarten-5
  • Enrollment: 842 students
  • Student-Teacher Ratio: 25:1
  • Minority Enrollment: 84%
  • : Top 20% in CA
  • : 61% (Top 20%)
  • : 62% (Top 30%)
  • : 40-44% (Top 30%)
  • Source: National Center for Education Statistics (NCES), CA Dept. of Education

Top Rankings

J. Marion Roynon Elementary School ranks among the top 20% of public schools in California for:

Category
Attribute
Overall Rank
Highest overall rank (Top 20%)
Math Proficiency
Highest math proficiency (Top 20%)

School Overview

J. Marion Roynon Elementary School's student population of 842 students has grown by 25% over five school years.
The teacher population of 34 teachers has grown by 13% over five school years.
Grades Offered
Grades Kindergarten-5

Distribution of Students By Grade Trends

GradeJ. Marion Roynon Elementary School
Kind208
1120
2122
3130
4125
5137
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Total Students
842 students

Total Students Trends Over Years (1989-2025)

YearJ. Marion Roynon Elementary School
2025842
2024804
2023841
2022693
2021671
2020719
2019716
2018741
2017741
2016753
2015743
2014743
2013751
2012761
2011771
2010727
2009708
2008591
2007720
2006737
2005701
2004707
2003736
2002759
2001828
2000829
1999827
1998797
1997784
1996786
1995802
1994777
1993797
1992791
19911,013
19901,000
1989984
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Total Classroom Teachers
34 teachers

Total Classroom Teachers Trends Over Years (1987-2025)

YearJ. Marion Roynon Elementary School
202534
202433
202334
202230
202130
201929
201830
201730
201629
201529
201429
201327
201230
201031
200933
200837
200734
200635
200534
200432
200335
200237
200140
200038
199936
199836
199739
199625
199530
199430
199328
199237
199137
199037
198938
198836
198735
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School Calendar
View School Calendar

School Rankings

J. Marion Roynon Elementary School ranks within the top 20% of all 9,523 schools in California (based off of combined math and reading proficiency testing data).
The diversity score of J. Marion Roynon Elementary School is 0.58, which is less than the diversity score at state average of 0.63. The school's diversity has stayed relatively flat over five school years.
Definition of Terms
This School
State Level (CA)
#1497 out of 9523 schools
(Top 20%)

Overall School Rank Trends Over Years (2010-2023)

YearJ. Marion Roynon Elementary School
2023#1497
2022#1656
2019#1546
2018#1300
2017#1733
2016#2226
2015#3017
2013#1731
2012#1553
2011#1571
2010#1829
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61%
34%

Math Proficiency Comparison Over Years (2010-2023)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
202361%34%58%
202255%33%53%
201961%40%59%
201858%39%56%
201753%38%54%
201648%37%48%
201539%34%45%
201378%59%76%
201277%59%74%
201179%58%71%
201075%56%66%
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62%
47%

Reading and Language Arts Proficiency Comparison Over Years (2010-2022)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
202262%47%68%
201968%51%70%
201872%50%56%
201766%48%67%
201661%48%62%
201547%44%57%
201367%57%73%
201272%58%73%
201168%56%71%
201064%54%68%
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40-44%
29%
Student-Teacher Ratio
25:1
21:1

Student-Teacher Ratio Comparison Over Years (1987-2025)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
202525:121:1
202424:122:124:1
202325:122:123:1
202223:122:123:1
202122:122:124:1
201925:123:124:1
201825:123:125:1
201725:123:125:1
201626:124:125:1
201526:124:125:1
201426:124:125:1
201328:124:126:1
201225:124:125:1
201023:122:124:1
200922:121:123:1
200816:118:117:1
200721:122:124:1
200621:122:124:1
200521:122:123:1
200422:122:124:1
200321:121:124:1
200221:121:124:1
200121:121:123:1
200022:122:124:1
199923:122:124:1
199822:122:124:1
199720:124:124:1
199631:125:130:1
199527:125:127:1
199426:125:128:1
199328:125:127:1
199221:124:126:1
199128:124:126:1
199027:124:126:1
198926:124:126:1
198826:124:127:1
198725:124:125:1
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American Indian
n/a
1%

American Indian Student Percentage Comparison Over Years (1992-2007)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
20073%2%
20021%2%1%
20012%2%2%
20001%1%1%
19991%1%2%
19981%1%1%
19941%1%
19931%1%
19922%1%
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Asian
11%
12%

Asian Student Percentage Comparison Over Years (1988-2024)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
202410%12%11%
20239%12%11%
20227%12%9%
20217%12%9%
20207%12%9%
20196%12%9%
20184%11%8%
20174%11%8%
20163%11%8%
20153%11%7%
20142%11%7%
20132%11%7%
20122%11%7%
20113%11%7%
20103%11%7%
20093%11%7%
20083%12%8%
20075%12%8%
20064%12%9%
20053%12%7%
20044%12%7%
20034%11%8%
20024%11%8%
20014%11%8%
20006%11%8%
19996%11%8%
19985%11%8%
19975%11%8%
19964%11%8%
19954%11%10%
19944%11%9%
19934%11%9%
19923%11%9%
19915%11%8%
19905%10%8%
19895%10%8%
19884%10%8%
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Hispanic
62%
56%

Hispanic Student Percentage Comparison Over Years (1988-2024)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
202463%56%57%
202363%55%57%
202264%56%56%
202164%56%55%
202065%55%53%
201969%55%53%
201870%54%51%
201770%54%51%
201666%54%51%
201568%54%51%
201464%53%49%
201362%53%47%
201262%52%47%
201158%51%45%
201054%50%44%
200945%49%30%
200853%50%37%
200743%49%32%
200643%48%31%
200537%47%31%
200439%46%30%
200342%45%32%
200241%44%31%
200139%43%30%
200037%42%29%
199936%41%28%
199835%40%28%
199732%40%26%
199633%39%26%
199531%38%24%
199430%37%23%
199330%36%22%
199228%35%21%
199124%34%21%
199023%33%20%
198924%31%19%
198824%30%18%
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Black
3%
5%

Black Student Percentage Comparison Over Years (1988-2024)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
20242%5%2%
20233%5%2%
20223%5%2%
20212%5%2%
20202%5%3%
20192%5%3%
20183%6%3%
20173%6%3%
20165%6%3%
20154%6%3%
20145%6%3%
20135%6%4%
20124%6%3%
20115%7%3%
20104%7%3%
20093%7%3%
20084%8%4%
20077%8%6%
20066%8%7%
20056%8%6%
20046%8%7%
20035%8%5%
20024%8%5%
20014%8%4%
20004%9%5%
19995%9%5%
19985%9%5%
19975%9%5%
19966%9%5%
19956%9%5%
19945%9%5%
19935%9%5%
19924%9%5%
19914%9%5%
19904%9%5%
19894%9%5%
19883%9%4%
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White
16%
20%

White Student Percentage Comparison Over Years (1988-2024)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
202418%20%21%
202319%21%22%
202219%21%23%
202120%22%24%
202019%23%27%
201917%23%27%
201818%24%30%
201718%24%30%
201621%24%31%
201521%24%32%
201424%25%34%
201325%25%35%
201225%26%36%
201126%27%37%
201029%27%38%
200931%28%39%
200840%29%51%
200738%29%45%
200641%31%46%
200546%31%48%
200447%32%50%
200349%34%53%
200250%35%55%
200151%36%56%
200052%37%57%
199952%38%57%
199854%39%58%
199758%39%60%
199657%40%60%
199559%41%61%
199460%42%63%
199360%43%64%
199263%44%65%
199167%45%66%
199068%47%67%
198967%49%68%
198869%50%70%
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Hawaiian
n/a
n/a
Two or more races
8%
6%

Two or More Races Student Percentage Comparison Over Years (2010-2024)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
20247%6%9%
20236%6%8%
20227%5%10%
20217%5%10%
20207%4%8%
20196%4%8%
20185%4%8%
20175%4%8%
20165%4%7%
20154%3%7%
20145%3%7%
20136%3%7%
20127%3%7%
20118%2%8%
201010%3%8%
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All Ethnic Groups
0.58
0.63

Diversity Score Comparison Over Years (1989-2025)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
20250.580.63
20240.560.630.62
20230.560.640.62
20220.550.630.62
20210.550.620.63
20200.550.630.64
20190.490.630.64
20180.480.640.64
20170.480.640.64
20160.520.640.64
20150.490.640.63
20140.530.650.64
20130.550.650.65
20120.550.650.65
20110.590.670.65
20100.620.670.65
20090.670.710.71
20080.560.650.60
20070.690.670.57
20060.660.660.57
20050.660.670.56
20040.650.670.56
20030.590.670.61
20020.580.670.60
20010.590.670.59
20000.590.670.59
19990.600.670.59
19980.590.670.58
19970.560.670.57
19960.570.670.56
19950.560.670.56
19940.550.670.55
19930.550.670.53
19920.530.670.52
19910.490.670.52
19900.490.660.51
19890.490.650.49
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Eligible for Free Lunch
41%
54%

Free Lunch Eligibility Comparison Over Years (1994-2025)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
202541%54%
202443%54%32%
202341%51%32%
202239%51%30%
202143%53%31%
202042%52%32%
201946%52%32%
201843%49%26%
201743%49%26%
201646%50%27%
201548%50%27%
201446%49%25%
201344%48%24%
201142%46%23%
201033%46%18%
200926%43%14%
200836%41%19%
200731%40%17%
200635%40%17%
200531%40%17%
200430%40%16%
200336%39%19%
200230%39%18%
200131%39%17%
200033%40%18%
199934%40%19%
199845%47%24%
199745%47%26%
199647%46%26%
199543%45%25%
199445%43%25%
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Eligible for Reduced Lunch
2%
8%

Reduced-Price Lunch Eligibility Comparison Over Years (2000-2025)

YearJ. Marion Roynon Elementary SchoolCaliforniaBonita Unified School District
20252%8%
20242%8%2%
20233%8%2%
20227%7%6%
20216%6%5%
20207%7%7%
20197%7%7%
201811%9%7%
201711%9%7%
201612%9%8%
201511%9%8%
201411%9%7%
201312%7%7%
201110%8%6%
201010%9%7%
200911%10%6%
200814%10%8%
200712%10%7%
20069%9%6%
20059%9%6%
200411%9%6%
200310%9%6%
20029%8%5%
20019%8%5%
200010%7%5%
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School Statewide Testing
View Education Department Test Scores
School District Name
Bonita Unified School District
Source: National Center for Education Statistics (NCES), CA Dept. of Education

School Notes

  • School Mascot: Raccoon
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Frequently Asked Questions

What is J. Marion Roynon Elementary School's ranking?
J. Marion Roynon Elementary School is ranked #1497 out of 9,523 schools, which ranks it among the top 20% of public schools in California.
What schools are J. Marion Roynon Elementary School often compared to?
J. Marion Roynon Elementary Schoolis often viewed alongside schools like Oak Mesa Elementary School, Grace Miller 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 34% CA state average), while 62% of students have achieved reading proficiency (compared to the 47% CA state average).
How many students attend J. Marion Roynon Elementary School?
842 students attend J. Marion Roynon Elementary School.
What is the racial composition of the student body?
62% of J. Marion Roynon Elementary School students are Hispanic, 16% of students are White, 11% of students are Asian, 8% of students are Two or more races, and 3% of students are Black.
What is the student-teacher ratio of J. Marion Roynon Elementary School?
J. Marion Roynon Elementary School has a student ration of 25:1, which is higher than the California state average of 21:1.
What grades does J. Marion Roynon Elementary School offer ?
J. Marion Roynon Elementary School offers enrollment in grades Kindergarten-5
What school district is J. Marion Roynon Elementary School part of?
J. Marion Roynon Elementary School is part of Bonita Unified School District.

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Quick Facts (2026)

  • Grades: Kindergarten-5
  • Enrollment: 842 students
  • Student-Teacher Ratio: 25:1
  • Minority Enrollment: 84%
  • : Top 20%
  • : 61% (Top 20%)
  • : 62% (Top 30%)
  • : 40-44% (Top 30%)
  • Source: National Center for Education Statistics (NCES), CA Dept. of Education

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