Rio Mesa High School is a high school in Ventura County, California. Located northeast of Oxnard, the school is surrounded by strawberry fields and other crops growing on the Oxnard Plain. The school is part of the Oxnard Union High School District.
Serving 1,951 students in grades 9-12, Rio Mesa High School ranks in the bottom 50% of all schools in California for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is 16% (which is lower than the California state average of 34%). The percentage of students achieving proficiency in reading/language arts is 43% (which is lower 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 95% of the student body (majority Hispanic), which is higher than the California state average of 80% (majority Hispanic).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 1,951 students
- Student-Teacher Ratio: 23:1
- Minority Enrollment: 95%
- Graduation Rate: 90% (Top 50% in CA)
- Overall Testing Rank: Bottom 50%
- Math Proficiency: 16% (Btm 50%)
- Reading Proficiency: 43% (Top 50%)
- Science Proficiency: 5% (Btm 50%)
- Source: National Center for Education Statistics (NCES), CA Dept. of Education
School Overview
Rio Mesa High School's student population of 1,951 students has declined by 18% over five school years.
The teacher population of 85 teachers has declined by 13% over five school years.
Grades Offered
Grades 9-12
Total Students
1,951 students
Total Classroom Teachers
85 teachers
Year Founded
1965
School Calendar
School Rankings
Rio Mesa High School ranks within the bottom 50% of all 9,523 schools in California (based off of combined math and reading proficiency testing data).
The diversity score of Rio Mesa High School is 0.24, 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
#6117 out of 9523 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
16%
34%
Reading/Language Arts Test Scores (% Proficient)
43%
47%
Science Test Scores (% Proficient)
5%
29%
Student-Teacher Ratio
23:1
21:1
American Indian
n/a
1%
Asian
5%
12%
Hispanic
87%
56%
Black
1%
5%
White
5%
20%
Hawaiian
n/a
n/a
Two or more races
2%
6%
All Ethnic Groups
Graduation Rate
90%
87%
Eligible for Free Lunch
62%
54%
Eligible for Reduced Lunch
10%
8%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), CA Dept. of Education
School Notes
- School Mascot: The Spartans
Frequently Asked Questions
What is Rio Mesa High School's ranking?
Rio Mesa High School is ranked #6117 out of 9,523 schools, which ranks it among the bottom 50% of public schools in California.
What schools are Rio Mesa High School often compared to?
Rio Mesa High Schoolis often viewed alongside schools like Pacifica High School, Oxnard High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
16% of students have achieved math proficiency (compared to the 34% CA state average), while 43% of students have achieved reading proficiency (compared to the 47% CA state average).
What is the graduation rate of Rio Mesa High School?
The graduation rate of Rio Mesa High School is 90%, which is higher than the California state average of 87%.
How many students attend Rio Mesa High School?
1,951 students attend Rio Mesa High School.
What is the racial composition of the student body?
87% of Rio Mesa High School students are Hispanic, 5% of students are Asian, 5% of students are White, 2% of students are Two or more races, and 1% of students are Black.
What is the student-teacher ratio of Rio Mesa High School?
Rio Mesa High School has a student ration of 23:1, which is higher than the California state average of 21:1.
What grades does Rio Mesa High School offer ?
Rio Mesa High School offers enrollment in grades 9-12
What school district is Rio Mesa High School part of?
Rio Mesa High School is part of Oxnard Union High School District.
In what neighborhood is Rio Mesa High School located?
Rio Mesa High School is located in the Strickland neighborhood of Oxnard, CA.
School Reviews
Review Rio Mesa High School. Reviews should be a few sentences in length. Please include any comments on:
- Quality of academic programs, teachers, and facilities
- Availability of music, art, sports and other extracurricular activities
Recent Articles
AI Report Cards: Should Schools Evaluate AI Use?
Explore whether schools should assess student AI use, the benefits, risks, and what responsible AI report cards could look like in 2026.
The Parent’s Guide to School Cell Phone Bans in 2026
Learn how school cell phone bans work in 2026, why districts are adopting them, and what parents should expect.
Parental Involvement in Public Schools: 2026 Update
Explore the latest 2026 trends, research, and strategies shaping parental involvement in public schools and student success.
