Diamond Ranch High School is a high school that serves students from Diamond Bar and Phillips Ranch, California, United States, and is operated by the Pomona Unified School District in Pomona, California – part of the Greater Los Angeles MSA.
Serving 1,567 students in grades 9-12, Diamond Ranch High School ranks in the top 50% of all schools in California for overall test scores (math proficiency is top 50%, and reading proficiency is top 50%).
The percentage of students achieving proficiency in math is 27% (which is lower than the California state average of 33%). The percentage of students achieving proficiency in reading/language arts is 65% (which is higher than the California state average of 47%).
The student:teacher ratio of 23:1 is higher than the California state level of 21:1.
Minority enrollment is 96% of the student body (majority Hispanic), which is higher than the California state average of 80% (majority Hispanic).
Quick Stats (2025)
- Grades: 9-12
- Enrollment: 1,567 students
- Student:Teacher Ratio: 23:1
- Minority Enrollment: 96%
- Graduation Rate: 97% (Top 10% in CA)
- Overall Testing Rank: Top 50%
- Math Proficiency: 27% (Top 50%)
- Reading Proficiency: 65% (Top 20%)
- Science Proficiency: 32% (Top 50%)
- Source: National Center for Education Statistics (NCES), CA Dept. of Education
Top Rankings
Diamond Ranch High School ranks among the top 20% of public schools in California for:
Category
Attribute
Reading/Language Arts Proficiency
Graduation Rate
School Overview
Diamond Ranch High School's student population of 1,567 students has stayed relatively flat over five school years.
The teacher population of 69 teachers has stayed relatively flat over five school years.
Grades Offered
Grades 9-12
Total Students
1,567 students
Gender %
Total Classroom Teachers
69 teachers
Year Founded
1997
Colors
Black, Blue, Silver
School Rankings
Diamond Ranch High School ranks within the top 50% of all 9,602 schools in California (based off of combined math and reading proficiency testing data).
The diversity score of Diamond Ranch High School is 0.38, 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.
Overall Testing Rank
#3231 out of 9602 schools
(Top 50%)
(Top 50%)
Math Test Scores (% Proficient)
27%
33%
Reading/Language Arts Test Scores (% Proficient)
65%
47%
Science Test Scores (% Proficient)
32%
29%
Student : Teacher Ratio
23:1
21:1
American Indian
n/a
1%
Asian
10%
12%
Hispanic
78%
56%
Black
5%
5%
White
4%
20%
Hawaiian
n/a
n/a
Two or more races
3%
6%
All Ethnic Groups
Graduation Rate
97%
87%
Eligible for Free Lunch
62%
54%
Eligible for Reduced Lunch
18%
8%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), CA Dept. of Education
Profile last updated: 02/09/2025
Frequently Asked Questions
What is Diamond Ranch High School's ranking?
Diamond Ranch High School is ranked #3231 out of 9,602 schools, which ranks it among the top 50% of public schools in California.
What schools are Diamond Ranch High School often compared to?
Diamond Ranch High Schoolis often viewed alongside schools like Diamond Bar High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
27% of students have achieved math proficiency (compared to the 33% CA state average), while 65% of students have achieved reading proficiency (compared to the 47% CA state average).
What is the graduation rate of Diamond Ranch High School?
The graduation rate of Diamond Ranch High School is 97%, which is higher than the California state average of 87%.
How many students attend Diamond Ranch High School?
1,567 students attend Diamond Ranch High School.
What is the racial composition of the student body?
78% of Diamond Ranch High School students are Hispanic, 10% of students are Asian, 5% of students are Black, 4% of students are White, and 3% of students are Two or more races.
What is the student:teacher ratio of Diamond Ranch High School?
Diamond Ranch High School has a student ration of 23:1, which is higher than the California state average of 21:1.
What grades does Diamond Ranch High School offer ?
Diamond Ranch High School offers enrollment in grades 9-12
What school district is Diamond Ranch High School part of?
Diamond Ranch High School is part of Pomona Unified School District.
School Reviews
2 10/26/2020
I currently attend this school. It has a strong set of teachers in the Spanish and English departments. As for the rest of the subjects, I feel as though it comes down to the student''s motivation to want to learn. Even in my current Honors class, there are people that just seem to have no motivation to even attempt their work. It all comes down to this one saying, You can lead a horse to water but, you can''t make it drink. I have an older sibling who attended Garey High School and managed to get into one of the top UCs out there. If you want to learn it comes down to your own willingness to learn. As long as you have the motivation and help from teachers and/ or tutors you should be fine. :) We are currently in the middle of a pandemic but I feel as though this school year hasn''t been the worst. Hopefully, I can enjoy senior year in person and be able to give this school a higher rating. I have one last comment: DO TUTORING IF YOU NEED THE HELP OR ASK YOUR TEACHER TO HELP EXPLAIN IT!!!!!!!!!!!!!!!!!!!!! Don''t be afraid to ask for help. :D (I am also in the VAPA program through art at the moment and it''s been good so far. Sometimes Mr. Crockett gets a little off-topic though lol. )
5 1/20/2020
One of the best high schools in the Pomona Unified District. A very high, rigorous, and challenging academics and athletic programs. Their is a strong Music Department and a variety of after-school programs and clubs. Their is tutoring all the time with the teachers and clubs that offer tutoring.
2 6/23/2008
As a former teacher of Diamond Ranch High School, I must say that unless your child attends the honor and/or AP classes offered at this school, he or she will get very little out of this school due to mismanagement by the administration and the misappropriation of funding.
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