Which school districts serve a ZIP Code?
The lookup runs entirely in your browser and sends nothing anywhere.
More often than not, more than one. The Census Bureau publishes 33,559 ZIP Code Tabulation Areas with homes in them — the closest thing to a ZIP Code that has an area at all. The federal boundary file counts homes for a school district in 33,555 of them, and that is the denominator for every figure on this site. 17,865 of those are served by more than one school district: 53% of those areas, not of the country's people or its land. The rate is not the same everywhere: it runs from none at all in Hawaii, the District of Columbia and Puerto Rico, where one district covers everything, to four in five in Nebraska. Where it is not zero, a lookup answering with one district name is wrong for some of the homes.
- Served by more than one district17,865 of 33,555
The answer has two halves, and they do not always agree
A ZIP Code area is served by one set of districts for elementary grades and another for high school. They are usually the same set. In 2,682 of them they are not: the elementary district stops before high school and a separate secondary district takes over, so a child at one address attends two different districts as they grow up.
In 686 ZIP Code areas the federal file names an elementary district and leaves more than 2% of the homes counted there with no high school district named. That is a real arrangement rather than a hole in the data: the town runs grade school itself and pays tuition somewhere else for the rest.
What this site computes
The Census Bureau publishes which school district each census block belongs to, and how many homes are in each block. It does not publish what happens when you group those blocks by ZIP Code area. Everything on this site is that grouping, worked out here: which districts touch each ZIP Code area, how many of its homes each one holds, whether the two grade bands agree, and how the answer varies from state to state.
- Look up a ZIP Code33,555 areas
- Every state, ranked by how often the lines cross50 states, DC and PR
- The most divided ZIP Codes in the countryup to 19 districts
- Where grade school and high school differ2,682 areas
- Where no high school district is named686 areas
- The largest districts with a page here260 with pages
- Districts that never hold a ZIP Code alone7,590 districts
- Every district with a page here260 pages
- Every ZIP Code with a page here172 pages
Where the lines cross most
The share of a state's ZIP Code areas that more than one district serves runs from none at all to four in five. The six at the top of that range keep 2,097 school districts between them over 3,983 populated ZIP Code areas — close to one district for every postal area, and that ratio is the whole of the explanation.
What to do next
Ask the district office to confirm your street address. A district settles that question on its own site: look for a school locator, a find my school tool, or an attendance zone map. Where there is none, ask the office itself.
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.
This site links to no district website. None of the federal files it is built from publishes one, and a guessed address is worse than none. It is the district office, not a search engine, that settles an address.
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.
What this cannot tell you
The homes were counted in the 2020 Census and the district lines are the 2026 boundary file. Nothing on this page adjusts one to the other. Where houses have been built or cleared since the count, a share here describes the place as it was counted rather than as it stands today, and in the fastest-growing ZIP Code areas that gap is the largest single source of error on this site.
A share on this page is a share of the homes in the ZIP Code area, not a probability for any particular address. Enrollment is decided by street address, and a district may run magnet, charter or choice programs that ignore the boundary entirely. If a decision depends on the answer, the district office is the only authority; this page shows what the federal boundary files say and when they were published.
A district boundary is not a school attendance zone. This site never says which school an address is assigned to: no current national dataset of attendance zones exists, and the district draws them itself. Nor is anything here endorsed or certified by the Census Bureau; we use their published files, and that is the whole of the relationship.
A ZIP Code is a set of mail delivery routes, not an area. What is mapped here is the Census Bureau's ZIP Code Tabulation Area, the closest published approximation to it. The two are not identical, and a handful of ZIP Codes used only for post office boxes or single buildings have no tabulation area at all.