Serving 2,507 students in grades 9-12, Cosby High School ranks in the top 30% of all schools in Virginia for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is 65-69% (which is approximately equal to the Virginia state average of 68%). The percentage of students achieving proficiency in reading/language arts is 92% (which is higher than the Virginia state average of 69%).
The student-teacher ratio of 16:1 is higher than the Virginia state level of 14:1.
Minority enrollment is 37% of the student body (majority Black), which is lower than the Virginia state average of 56% (majority Black).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 2,507 students
- Student-Teacher Ratio: 16:1
- Minority Enrollment: 37%
- Graduation Rate: 98% (Top 5% in VA)
- Overall Testing Rank: Top 30%
- Math Proficiency: 65-69% (Btm 50%)
- Reading Proficiency: 92% (Top 5%)
- Science Proficiency: 83% (Top 5%)
- Source: National Center for Education Statistics (NCES), VA Dept. of Education
Top Rankings
Cosby High School ranks among the top 20% of public schools in Virginia for:
Category
Attribute
Reading/Language Arts Proficiency
Science Proficiency
Graduation Rate
School Overview
Cosby High School's student population of 2,507 students has grown by 13% over five school years.
The teacher population of 158 teachers has grown by 29% over five school years.
Grades Offered
Grades 9-12
(Supplemental Virtual)
(Supplemental Virtual)
Total Students
2,507 students
Total Classroom Teachers
158 teachers
Year Founded
2007
Average Class Size
21 students
School Rankings
Cosby High School ranks within the top 30% of all 1,773 schools in Virginia (based off of combined math and reading proficiency testing data).
The diversity score of Cosby High School is 0.57, which is less than the diversity score at state average of 0.72. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#453 out of 1773 schools
(Top 30%)
(Top 30%)
Math Test Scores (% Proficient)
65-69%
68%
Reading/Language Arts Test Scores (% Proficient)
(20-21)92%
69%
Science Test Scores (% Proficient)
(20-21)83%
59%
Student-Teacher Ratio
16:1
14:1
American Indian
n/a
n/a
Asian
6%
8%
Hispanic
9%
20%
Black
16%
21%
White
63%
44%
Hawaiian
n/a
n/a
Two or more races
6%
7%
All Ethnic Groups
Graduation Rate
98%
89%
Eligible for Free Lunch
14%
57%
Eligible for Reduced Lunch
2%
2%
School Statewide Testing
School District Name
Chesterfield County School District
Source: National Center for Education Statistics (NCES), VA Dept. of Education
School Notes
- School Mascot: Titans
Frequently Asked Questions
What is Cosby High School's ranking?
Cosby High School is ranked #453 out of 1,773 schools, which ranks it among the top 30% of public schools in Virginia.
What schools are Cosby High School often compared to?
Cosby High Schoolis often viewed alongside schools like Midlothian High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
65-69% of students have achieved math proficiency (compared to the 68% VA state average), while 92% of students have achieved reading proficiency (compared to the 69% VA state average).
What is the graduation rate of Cosby High School?
The graduation rate of Cosby High School is 98%, which is higher than the Virginia state average of 89%.
How many students attend Cosby High School?
2,507 students attend Cosby High School.
What is the racial composition of the student body?
63% of Cosby High School students are White, 16% of students are Black, 9% of students are Hispanic, 6% of students are Asian, and 6% of students are Two or more races.
What is the student-teacher ratio of Cosby High School?
Cosby High School has a student ration of 16:1, which is higher than the Virginia state average of 14:1.
What grades does Cosby High School offer ?
Cosby High School offers enrollment in grades 9-12 (Supplemental Virtual).
What school district is Cosby High School part of?
Cosby High School is part of Chesterfield County School District.
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