Summary:
Zip code 20191 is home to one high school: South Lakes High in Reston, Virginia. This large school serves grades 9 through 12 and enrolls 2,434 students as part of Fairfax County Public Schools, a district rated 4 stars. The school has a favorable student-to-teacher ratio of 11.6, with 34.26% of students eligible for free or reduced lunch and per-pupil spending of $11,614.
As the only high school in the zip code, South Lakes High stands out on its own merits. The school is on an upward trajectory, improving its state ranking from 190 out of 328 (42nd percentile, 2 stars) in 2024-2025 to 164 out of 331 (50th percentile, 3 stars) in 2025-2026. Graduation outcomes are a clear strength: 95.9% of students graduate, well above the district (92.7%) and state (92.3%), while the dropout rate of 2.5% is roughly half the district and state averages. However, chronic absenteeism is a serious concern, with 20.7% of students chronically absent compared to 11.9% in the district and 14.8% statewide.
Academically, the school excels in freshman mathematics, with 100% of 9th graders passing Algebra II in both 2024-2025 and 2025-2026, and strong results in Algebra I (87.72%) and Geometry (89.43%). Upper-grade science is also a relative strength, including 92.31% proficiency in 12th-grade Biology. Weak spots include 10th-grade Biology, which fell to 38.1% proficiency in 2024-2025, and 12th-grade English Reading, which dropped to 48% in 2025-2026, trailing the district and state. Overall, South Lakes High is an improving school with excellent graduation rates and strong math performance, but targeted support for attendance, 10th-grade Biology, and 12th-grade reading will be key to continued growth.
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