The data behind this site, as three CSV files
Every US ZIP Code Tabulation Area, every school district that reaches into it, and the number of homes each one holds there, computed from Census Bureau block files and published as CSV. Nothing here is behind a form or an API key: the three files below are the whole of what the site computes, at the version this build was made from, and the file names carry that version so a link to one of them cannot quietly change meaning.
The three files
They are normalized rather than flattened into one sheet: the name of a district repeated across every one of its areas would have weighed more than the rest of the data together. Join them on the ZIP Code Tabulation Area and on the district identifier, both of which are federal codes rather than ours.
What the share is, and what it is not
A share in these files is the share of the homes inside one ZIP Code Tabulation Area that fall inside one school district. It is not a probability for any particular address. Enrollment follows the street: a home on the wrong side of a road can sit in the district that holds two percent of the area while its neighbors sit in the one that holds ninety. The share tells you how wrong a single-district answer would be across the area as a whole, which is the question this site exists to answer, and it tells you nothing at all about one house.
The homes were counted in the 2020 Census and the district lines are the 2026 boundary file, so in a place built since the count the proportions describe the area as it was counted. That gap is the largest single source of error in these files.
How to cite it
These files may be republished, in whole or in part, with a link back. The underlying Census Bureau files are works of the United States government and are in the public domain; the grouping, the computed shares and the wording here are ours. A ready-made line:
DistrictByZip, “School districts by ZIP Code Tabulation Area”, BiLingoPlus LLC, 2026. https://districtbyzip.com/data/ (retrieved 04 November 2026).
Put the box on your own site
The lookup exists as a page of its own, made to sit in a frame on somebody else’s site. It carries the same caveats every page here carries. Unlike the rest of this site, the box page carries no page counter: it stores nothing, and after it has loaded it sends nothing anywhere. Copy this line and change the height to suit your layout:
<iframe src="https://districtbyzip.com/embed/" width="100%" height="520" style="border:0" loading="lazy" title="Which school districts serve this ZIP Code?"></iframe>
It is free to use with a link back. A real estate site can carry it for the same reason the rest of this site exists: it reports where the district lines run and grades nothing inside them, so it says nothing about school quality that an agent is not allowed to say.
What is not here yet
There is no month-by-month record of what changed, because this build has one snapshot and a difference needs two. The moment a second snapshot exists, the districts that gained or lost homes become a page of their own; until then, saying so would be inventing a history. There is also no school-level file, and there will not be one: a district boundary is not a school attendance zone, and no current national set of attendance zones exists.
What to do next
Ask the district office to confirm your street address: look on its site for a school locator, a find my school tool or an attendance zone map, or call the office.
A ZIP Code is a set of mail delivery routes, not a boundary: 17,865 of the 33,555 ZIP Code areas in the country with homes in them are served by more than one school district, and the line between two of them runs along streets. Only the district can say which side of that line an address is on.
District websites and phone numbers here come from the NCES Common Core of Data directory, 2024-25 school year, filed under the same district ID as the Census boundary files. Where it lists no usable website, none is printed rather than guessed.
If a house purchase depends on the answer, ask the district itself for written confirmation of that exact address. A listing is not a district record, and neither is this page.
Where these numbers come from
The homes were counted in the 2020 Census and the district lines are the 2026 boundary file, so a fast-growing area may have changed since; ZIP Codes here are the Census Bureau's ZIP Code Tabulation Areas; a share is a share of homes, not the chance that one address is in a district; and a district is not a school attendance zone. Every source, file and caveat is on the method page.