Cosby High

Cosby High operates as a sprawling 9-12 campus in Midlothian, Virginia, operated by Chesterfield County Public Schools. Current enrollment sits at 2,507 students spanning grades 9 through 12. Compared to the state average of about 1,213 students per school, that is 107% above typical.

Cosby High is one of 65 schools operated by Chesterfield County Public Schools, a district that instructs 64,194 students overall.

For racial and ethnic makeup, Cosby High records that White students make up the majority at 63%. Beyond that, the school logs 16% Black, 9% Hispanic, 6% multiracial, 6% Asian.

On the resource side, On paper, Cosby High has 158 full-time-equivalent teachers, translating to a class-load average of around 15.9:1. Statewide, the average ratio sits near 13.9:1, putting Cosby High higher than the state norm the norm. Around 16% of the student body qualifies for free or reduced-price meals, often used as a Title I proxy. That share is noticeably below Chesterfield County's rate of about 54%.

On a residual basis (actual vs predicted given the student mix), Cosby High sits in the middle band of the BeatsExpectations distribution. Schools with this campus's student mix typically land near 83.7%; this one delivers 86.0%.

In the surrounding community, ACS estimates for Chesterfield County put median household income runs about $101,931, 44% of adults hold a bachelor's degree or higher, and census figures put the poverty rate at about 5%. Across Chesterfield County's 76 public schools (combined enrollment of about 64,194 students), Cosby High is one campus in the mix.

Woolridge Elementary is the nearest neighboring public school, about 1.6 miles from this campus. Counting just inside five miles, 8 other public schools cluster around Cosby High. Ranking that nearby cluster on reported proficiency puts Cosby High at 4th of 9; the average score across the group is 84.1%.

The campus sits in a residential setting.

Looking at the recent track record. Looking back 7 years, enrollment at Cosby High has rose 15%, going from 2,186 students in 2018 to 2,507 in 2025. White enrollment moved from 72% to 63% across the same window. The student-to-teacher ratio pulled in from 18.7:1 in 2018 to 15.9:1 today.

Within the allk12 community for this school, members of the Cosby High community share and discuss classroom updates, athletics, and weather closures. The community welcomes input from current and former families.