Chantilly High

Chantilly High is a senior high of expansive scale in Chantilly, Virginia, one of the schools within Fairfax County Public Schools, instructing 2,937 students in grades 9 through 12. Enrollment runs roughly 142% above the state mean of about 1,213.

Across the 199 schools in Fairfax County Public Schools (179,323 students total), Chantilly High accounts for its share of the district's footprint.

On the student-mix side, Chantilly High logs that the most-represented group is Asian (39%), with the rest of the student body spread across multiple groups; the rest looks like 34% White, 16% Hispanic, 6% Black, 5% multiracial. The wider county runs roughly 20% Asian, putting the school's mix noticeably more Asian than the area baseline.

Looking at school resources, Chantilly High shows 229 full-time-equivalent teachers, putting the student-to-teacher ratio at about 12.8:1. That figure is tighter than the state norm's 13.9:1 average. About 21% of enrolled students meet the income threshold for free or reduced-price lunch, which schools and policymakers use as a rough income-mix signal. That share is lower than Fairfax County's rate of about 37%.

On a demographically-adjusted basis, Chantilly High performs roughly as the BeatsExpectations model predicts for a school with this FRL share. The predicted value is around 82.5%, the actual is 79.3%, a residual of -3.2 points.

Around the school, ACS estimates for Fairfax County put the typical household earns roughly $153,637 per year, roughly 65% of adults have completed at least a four-year degree, and the poverty rate sits near 4%. In all, Fairfax County runs 222 public schools (combined enrollment of about 174,475 students), of which Chantilly High is one.

The closest other public school is Greenbriar West Elementary, roughly 0.3 miles away. Counting just inside five miles, 8 other public schools cluster around Chantilly High. On composite proficiency, Chantilly High comes 7th of 9 in the immediate cluster, behind the nearby-schools average of 81.0%.

The school occupies an outer-ring site.

Looking at the recent track record. Over the past 7-year window, the student count climbed 5%: 2,810 students in 2018 compared to 2,937 in 2025. Over the same period, the White share shrank from 41% to 34%. The student-to-teacher ratio fell from 16.3:1 in 2018 to 12.8:1 today.

On allk12, the feed for Chantilly High typically covers enrollment questions, classroom assignments, and PTA news. The community welcomes input from current and former families.