Diamond Bar High School (Ranked Top 10% for 2025)

21400 Pathfinder Rd.
Diamond Bar, CA 91765

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Top 10%

Tel: (909) 594-1405

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Serving 2,532 students in grades 9-12, Diamond Bar High School ranks in the top 10% of all schools in California for overall test scores (math proficiency is top 10%, and reading proficiency is top 10%).

The percentage of students achieving is 68% (which is higher than the California state average of 34%). The percentage of students achieving is 78% (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 94% of the student body (majority Asian), which is higher than the California state average of 80% (majority Hispanic and Asian).

Quick Stats (2025)

Grades: 9-12
Enrollment: 2,532 students
Student:Teacher Ratio: 25:1
Minority Enrollment: 94%
: 97% (Top 5% in CA)
: Top 10%
: 68% (Top 10%)
: 78% (Top 10%)
: 47% (Top 20%)
Source: National Center for Education Statistics (NCES), CA Dept. of Education

Top Rankings

Diamond Bar High School ranks among the top 20% of public schools in California for:

School Overview

Diamond Bar High School's student population of 2,532 students has declined by 6% over five school years.

The teacher population of 100 teachers has declined by 7% over five school years.

Awards

Blue Ribbon School - Selected in 2022

Grades Offered

Grades 9-12

View Data

Distribution of Students By Grade Trends
Grade	Diamond Bar High School
9	602
10	650
11	648
12	632

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Total Students

2,532 students

View Data

Total Students Trends Over Years (1987-2023)
Year	Diamond Bar High School
2023	2,557
2022	2,534
2021	2,544
2020	2,709
2019	2,709
2018	3,042
2017	3,042
2016	3,061
2015	3,050
2014	2,988
2013	3,030
2012	3,044
2011	3,119
2010	3,110
2009	3,193
2008	3,258
2007	3,257
2006	3,314
2005	3,182
2004	3,094
2003	3,031
2002	2,957
2001	2,897
2000	2,861
1999	2,854
1998	2,881
1997	2,813
1996	2,745
1995	2,598
1994	2,487
1993	2,361
1992	2,303
1991	2,219
1990	2,087
1989	2,033
1988	1,981
1987	1,872

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Gender %

Total Classroom Teachers

100 teachers

View Data

Total Classroom Teachers Trends Over Years (1990-2023)
Year	Diamond Bar High School
2023	96
2022	98
2021	100
2020	108
2019	108
2018	116
2017	116
2016	113
2015	112
2014	112
2013	114
2012	112
2010	118
2009	122
2008	144
2007	127
2006	122
2005	123
2004	124
2003	124
2002	117
2001	115
2000	110
1999	110
1998	110
1997	106
1996	97
1995	90
1994	87
1993	81
1992	81
1991	80
1990	78

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Year Founded

1982

Colors

Purple, Gold

School Calendar

View School Calendar

Campus Size

School Mascot

Brahma Bull

School Rankings

Diamond Bar High School ranks within the top 10% of all 9,523 schools in California (based off of combined math and reading proficiency testing data).

The of Diamond Bar High School is 0.48, 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.

This School

State Level (CA)

#618 out of 9523 schools
(Top 10%)

View Data

Overall School Rank Trends Over Years (2012-2023)
Year	Diamond Bar High School
2023	#618
2022	#571
2021	#155
2019	#561
2018	#876
2017	#449
2016	#1028
2015	#401
2014	#233
2013	#624
2012	#554

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68%

34%

View Data

Math Proficiency Comparison Over Years (2012-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	68%	34%	71%
2022	70%	33%	70%
2021	77%	34%	74%
2019	73%	40%	75%
2018	69%	39%	74%
2017	75%	38%	73%
2016	69%	37%	71%
2015	73%	34%	68%
2014	89%	63%	89%
2013	87%	59%	84%
2012	87%	59%	84%

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78%

47%

View Data

Reading and Language Arts Proficiency Comparison Over Years (2011-2022)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2022	78%	47%	76%
2021	79%	49%	79%
2019	80%	51%	77%
2018	74%	50%	74%
2017	79%	48%	75%
2016	68%	48%	74%
2015	77%	44%	72%
2014	80%	58%	79%
2013	80%	57%	80%
2012	83%	58%	82%
2011	87%	56%	82%

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47%

29%

Student : Teacher Ratio

25:1

21:1

View Data

Student-Teacher Ratio Comparison Over Years (1990-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	27:1	22:1	25:1
2022	26:1	21:1	24:1
2021	25:1	22:1	24:1
2020	25:1	23:1	25:1
2019	25:1	23:1	25:1
2018	26:1	23:1	25:1
2017	26:1	23:1	25:1
2016	27:1	24:1	26:1
2015	27:1	24:1	26:1
2014	27:1	24:1	26:1
2013	27:1	24:1	26:1
2012	27:1	23:1	26:1
2010	26:1	21:1	24:1
2009	26:1	20:1	23:1
2008	23:1	18:1	21:1
2007	26:1	21:1	24:1
2006	27:1	20:1	24:1
2005	26:1	21:1	24:1
2004	25:1	21:1	23:1
2003	24:1	20:1	23:1
2002	25:1	20:1	23:1
2001	25:1	20:1	23:1
2000	26:1	21:1	24:1
1999	26:1	21:1	24:1
1998	26:1	21:1	24:1
1997	26:1	23:1	25:1
1996	28:1	25:1	27:1
1995	29:1	25:1	27:1
1994	29:1	25:1	28:1
1993	29:1	25:1	28:1
1992	28:1	24:1	28:1
1991	28:1	24:1	27:1
1990	27:1	24:1	26:1

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American Indian

n/a

Asian

70%

12%

View Data

Asian Student Percentage Comparison Over Years (1991-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	68%	12%	68%
2022	67%	12%	67%
2021	68%	12%	66%
2020	68%	12%	65%
2019	68%	12%	65%
2018	66%	11%	63%
2017	66%	11%	63%
2016	67%	11%	63%
2015	67%	11%	64%
2014	67%	11%	62%
2013	68%	11%	63%
2012	69%	11%	63%
2011	69%	11%	63%
2010	67%	11%	63%
2009	66%	11%	63%
2008	65%	12%	65%
2007	64%	12%	64%
2006	62%	12%	62%
2005	60%	12%	60%
2004	58%	12%	58%
2003	55%	11%	57%
2002	55%	11%	56%
2001	54%	11%	54%
2000	53%	11%	52%
1999	52%	11%	50%
1998	50%	11%	49%
1997	49%	11%	47%
1996	46%	11%	45%
1995	44%	11%	44%
1994	42%	11%	42%
1993	39%	11%	40%
1992	37%	11%	37%
1991	34%	11%	33%

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Hispanic

18%

56%

View Data

Hispanic Student Percentage Comparison Over Years (1991-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	19%	55%	22%
2022	19%	56%	23%
2021	18%	56%	23%
2020	18%	55%	23%
2019	18%	55%	23%
2018	20%	54%	24%
2017	20%	54%	24%
2016	18%	54%	23%
2015	18%	54%	23%
2014	17%	53%	23%
2013	17%	53%	23%
2012	16%	52%	22%
2011	15%	51%	22%
2010	14%	50%	21%
2009	14%	49%	20%
2008	13%	50%	19%
2007	13%	49%	19%
2006	13%	48%	19%
2005	12%	47%	19%
2004	13%	46%	19%
2003	14%	45%	18%
2002	14%	44%	19%
2001	14%	43%	19%
2000	12%	42%	18%
1999	12%	41%	18%
1998	12%	40%	18%
1997	11%	40%	18%
1996	12%	39%	18%
1995	11%	38%	18%
1994	11%	37%	18%
1993	12%	36%	18%
1992	13%	35%	18%
1991	14%	34%	19%

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Black

View Data

Black Student Percentage Comparison Over Years (1991-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	2%	5%	1%
2022	2%	5%	1%
2021	2%	5%	1%
2020	3%	5%	2%
2019	3%	5%	2%
2018	2%	6%	2%
2017	2%	6%	2%
2016	2%	6%	2%
2015	2%	6%	2%
2014	3%	6%	3%
2013	3%	6%	3%
2012	3%	6%	3%
2011	3%	7%	3%
2010	3%	7%	3%
2009	3%	7%	3%
2008	3%	8%	3%
2007	3%	8%	3%
2006	4%	8%	4%
2005	5%	8%	4%
2004	5%	8%	4%
2003	5%	8%	5%
2002	6%	8%	5%
2001	6%	8%	5%
2000	5%	9%	5%
1999	6%	9%	6%
1998	6%	9%	6%
1997	6%	9%	6%
1996	6%	9%	6%
1995	6%	9%	6%
1994	6%	9%	6%
1993	5%	9%	5%
1992	5%	9%	5%
1991	6%	9%	5%

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White

20%

View Data

White Student Percentage Comparison Over Years (1991-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	7%	21%	5%
2022	7%	21%	5%
2021	8%	22%	6%
2020	8%	23%	6%
2019	8%	23%	6%
2018	11%	24%	8%
2017	11%	24%	8%
2016	12%	24%	9%
2015	12%	24%	9%
2014	11%	25%	9%
2013	11%	25%	10%
2012	12%	26%	11%
2011	13%	27%	11%
2010	15%	27%	12%
2009	17%	28%	13%
2008	19%	29%	13%
2007	20%	29%	14%
2006	21%	31%	15%
2005	23%	31%	17%
2004	24%	32%	19%
2003	26%	34%	19%
2002	25%	35%	20%
2001	26%	36%	22%
2000	30%	37%	25%
1999	30%	38%	26%
1998	32%	39%	27%
1997	34%	39%	29%
1996	36%	40%	31%
1995	39%	41%	32%
1994	41%	42%	34%
1993	44%	43%	37%
1992	45%	44%	40%
1991	46%	45%	43%

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Hawaiian

n/a

View Data

Native Hawaiian or Pacific Islander Student Percentage Comparison Over Years (2010-2014)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2014	1%	1%	1%
2013	1%	1%
2010	1%	1%

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Two or more races

View Data

Two or More Races Student Percentage Comparison Over Years (2014-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	4%	6%	4%
2022	4%	5%	4%
2021	4%	5%	4%
2020	3%	4%	4%
2019	3%	4%	4%
2018	1%	4%	3%
2017	1%	4%	3%
2016	1%	4%	3%
2015	1%	3%	2%
2014	1%	3%	2%

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All Ethnic Groups

0.48

0.63

View Data

Diversity Score Comparison Over Years (1991-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	0.50	0.64	0.50
2022	0.51	0.63	0.51
2021	0.50	0.62	0.51
2020	0.50	0.63	0.53
2019	0.50	0.63	0.53
2018	0.52	0.64	0.54
2017	0.52	0.64	0.54
2016	0.51	0.64	0.54
2015	0.51	0.64	0.54
2014	0.51	0.65	0.56
2013	0.51	0.65	0.55
2012	0.50	0.65	0.55
2011	0.50	0.67	0.55
2010	0.51	0.67	0.55
2009	0.53	0.71	0.55
2008	0.54	0.65	0.54
2007	0.55	0.67	0.55
2006	0.56	0.66	0.56
2005	0.58	0.67	0.58
2004	0.59	0.67	0.59
2003	0.61	0.67	0.61
2002	0.62	0.67	0.61
2001	0.63	0.67	0.63
2000	0.62	0.67	0.64
1999	0.63	0.67	0.65
1998	0.64	0.67	0.66
1997	0.64	0.67	0.67
1996	0.65	0.67	0.67
1995	0.65	0.67	0.67
1994	0.65	0.67	0.68
1993	0.64	0.67	0.68
1992	0.65	0.67	0.68
1991	0.66	0.67	0.68

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97%

87%

View Data

Graduation Rate Comparison Over Years (2013-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	97%	87%	97%
2022	98%	87%	98%
2021	98%	84%	97%
2020	97%	85%	96%
2019	97%	84%	97%
2018	98%	84%	98%
2017	98%	83%	97%
2016	98%	83%	97%
2015	99%	89%	98%
2014	98%	88%	98%
2013	99%	87%	98%

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Eligible for

22%

54%

View Data

Free Lunch Eligibility Comparison Over Years (1995-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	21%	51%	24%
2022	22%	51%	24%
2021	19%	53%	22%
2020	18%	52%	20%
2019	18%	52%	20%
2018	7%	49%	9%
2017	7%	49%	9%
2016	7%	50%	10%
2015	5%	50%	6%
2014	7%	49%	9%
2013	8%	48%	10%
2011	5%	46%	8%
2010	5%	46%	8%
2009	3%	43%	6%
2008	1%	41%	4%
2007	3%	40%	6%
2006	3%	40%	7%
2005	3%	40%	6%
2004	3%	40%	6%
2003	3%	39%	6%
2002	1%	39%	4%
2001	2%	39%	4%
2000	3%	40%	5%
1999	3%	40%	5%
1998	10%	47%	6%
1997	4%	47%	7%
1996	4%	46%	6%
1995	1%	45%	5%

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Eligible for

View Data

Reduced-Price Lunch Eligibility Comparison Over Years (2002-2023)
Year	Diamond Bar High School	California	Walnut Valley Unified School District
2023	1%	8%	2%
2022	1%	7%	1%
2021	1%	6%	1%
2020	2%	7%	2%
2019	2%	7%	2%
2018	3%	9%	3%
2017	3%	9%	3%
2016	3%	9%	4%
2015	4%	9%	6%
2014	3%	9%	5%
2013	4%	7%	5%
2011	3%	8%	5%
2010	3%	9%	5%
2009	3%	10%	5%
2008	2%	10%	3%
2007	2%	10%	5%
2006	2%	9%	4%
2005	2%	9%	4%
2004	2%	9%	4%
2003	2%	9%	3%
2002	1%	8%	3%

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School Statewide Testing

View Education Department Test Scores

School District Name

Walnut Valley Unified School District

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

School Notes

School Mascot: Brahma Bull

Profile last updated: 02/09/2025

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Frequently Asked Questions

What is Diamond Bar High School's ranking?

Diamond Bar High School is ranked #618 out of 9,523 schools, which ranks it among the top 10% of public schools in California.

What schools are Diamond Bar High School often compared to?

Diamond Bar High Schoolis often viewed alongside schools like Walnut High School, Diamond Ranch High School by visitors of our site.

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

68% of students have achieved math proficiency (compared to the 34% CA state average), while 78% of students have achieved reading proficiency (compared to the 47% CA state average).

What is the graduation rate of Diamond Bar High School?

The graduation rate of Diamond Bar High School is 97%, which is higher than the California state average of 87%.

How many students attend Diamond Bar High School?

2,532 students attend Diamond Bar High School.

What is the racial composition of the student body?

70% of Diamond Bar High School students are Asian, 18% of students are Hispanic, 6% of students are White, 4% of students are Two or more races, and 2% of students are Black.

What is the student:teacher ratio of Diamond Bar High School?

Diamond Bar High School has a student ration of 25:1, which is higher than the California state average of 21:1.

What grades does Diamond Bar High School offer ?

Diamond Bar High School offers enrollment in grades 9-12

What school district is Diamond Bar High School part of?

Diamond Bar High School is part of Walnut Valley Unified School District.

School Reviews

5 6/30/2018

Performing arts program is amazing. Orchestra is #1 in nation.

- Posted by Student/Alumni - Anoynmous

Review Diamond Bar High School. Reviews should be a few sentences in length. Please include any comments on:

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