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NCES Common Core of Data — what district boundaries actually mean for buyers
When you search a ZIP, the schools you'll see are the ones inside that ZIP's NCES-defined district boundary. That sounds simple. It isn't.
Published 2026-04-25 · Last reviewed 2026-04-25 · methodology
What NCES is
The National Center for Education Statistics' Common Core of Data is the federal government's annual census of every public school, district, and state education agency.
It's free, structured, and authoritative — but it lags reality by about 18 months. The 2024–25 file releases late 2025 / early 2026.
District boundaries vs. ZIP boundaries
School districts and ZIP codes are drawn by different agencies and rarely align. One ZIP can sit inside three districts; one district can sweep across twelve ZIPs.
We map a primary district per ZIP based on geographic centroid + NCES SABS (School Attendance Boundary Survey) where available, and link out to the full NCES district page for any borderline cases.
What the data shows
Per-school: enrollment, student-teacher ratio, free/reduced-lunch share, demographic breakdown, Title I status.
Per-district: total enrollment, expenditures per pupil, revenue source mix (federal/state/local).
What it does NOT show: teaching quality, principal turnover, parent culture, bullying, or post-graduation outcomes. Visit the school. Talk to parents. Read the local paper.
Choice districts + magnet schools
Many large districts offer school choice — kids in one ZIP can apply to magnet/charter schools elsewhere. NCES boundary data captures only the default zoned assignment.
If you're moving for schools, call the district choice office before you sign — eligibility, lottery deadlines, and transportation rules vary city by city.
What zipradar shows
District name, primary feeder schools, district-level student-teacher ratio, and a deep-link to the NCES district detail page so you can audit the underlying numbers.
Last-updated stamp tells you which NCES release we're on. We don't show ratings — those come from third parties (GreatSchools, Niche) with proprietary methodologies.
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