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Sewanhaka Central High School District

New York · runs grade 7 through grade 12

There is no ZIP Code area where Sewanhaka Central High is the only school district serving the homes. It holds a real share in 7 of them and shares every one, with 16 different districts in total. A lookup that returns a single district name for any of those ZIP Codes is guessing which side of a line an address falls on.

It never has a ZIP Code to itself

At 3,451 homes to the square mile this is city territory, and district lines in a city follow streets. Sewanhaka Central High covers 12 square miles in all — small enough that a single ZIP Code area can hold most of it, and several ZIP Codes can cut across it.

  • Homes inside the boundary39,794
  • Residents123,211
  • ZIP Code areas it reaches7
  • Where it is the only district0
  • Where it shares with another district7
  • Where it holds under half a percent0
  • Land area12 square miles
  • Homes per square mile3,451

The ZIP Code areas it reaches

Every one of the 7 areas where it holds a real share it shares with somebody. Its largest foothold is 11003 at 94% of the homes; the thinnest is 11580, where it holds 11% of the homes.

What one name misses, and what changes later

Sewanhaka Central High is the largest district in 4 ZIP Code areas, and not one of them is wholly its own. Answer with its name alone and the answer misses 9,417 of the 44,922 homes those areas hold. That count is computed here from census blocks; the lookups that answer this question with a single name never print it.

Sewanhaka Central High is one of 6 districts the file names for ZIP Code 11040 · North New Hyde Park, New York at that level. It holds 8,316 of the 14,089 homes there; the rest is 5,765 homes with Herricks Union Free, Great Neck Union Free, New York City Department Of Education and 1 more district and 8 homes in a district too small to name here. One name for that area is not a simplification, it is a different answer for 5,773 of the homes in it.

ZIP Code 11010 · Franklin Square, New York is a two-district area: 6,854 of its 8,353 homes are inside Sewanhaka Central High, and the other 1,499 homes are with Valley Stream Central High. Which one an address belongs to is settled by the street, not by the five digits.

In ZIP Code 11001 · Floral Park, New York the split runs 8,206 to 1,427 and the larger part is Sewanhaka Central High's: the rest is 1,427 homes with New York City Department Of Education.

ZIP Code 11530 · Garden City, New York repeats the pattern with 5 names holding a real share: 1,743 of its 9,897 homes are Sewanhaka Central High's, and the other 8,154 are not.

The elementary districts that feed it

Students arrive at Sewanhaka Central High from 6 districts that run the lower grades on the same ground — Elmont Union Free, which sends 32%, Floral Park-Bellerose Union Free, which sends 16% and Franklin Square Union Free, which sends 15%. Each of those addresses therefore belongs to two districts at once, one for grade school and this one for high school, and neither name is the whole answer.

  • Elmont Union Free School District32% of Sewanhaka Central High's homes come from here
  • Floral Park-Bellerose Union Free School District16% of Sewanhaka Central High's homes come from here
  • Franklin Square Union Free School District15% of Sewanhaka Central High's homes come from here
  • New Hyde Park-Garden City Park Union Free School District11% of Sewanhaka Central High's homes come from here
  • Valley Stream Union Free School District 136.6% of Sewanhaka Central High's homes come from here
  • Herricks Union Free School District4.9% of Sewanhaka Central High's homes come from here

The names in this list are exact: the federal file gives the district of each band for every census block. The percentages are not. They spread each shared ZIP Code area's homes across the other band in proportion to the share each district holds there, because the file names the two districts of a block and not how a household moves between them. Read them as the size of the crossing, not as a count of houses.

Who it shares ZIP Codes with

Sewanhaka Central High shares ZIP Code areas with 16 different districts. The most frequent are Elmont Union Free, Franklin Square Union Free, Valley Stream Union Free School District 13 and Valley Stream Central High. In a neighborhood this crowded the question is not which district serves the ZIP Code but which side of which street an address is on.

  • Elmont Union Free School District6 shared ZIP areas
  • Franklin Square Union Free School District4 shared ZIP areas
  • Valley Stream Union Free School District 133 shared ZIP areas
  • Valley Stream Central High School District3 shared ZIP areas
  • New York City Department Of Education2 shared ZIP areas
  • Floral Park-Bellerose Union Free School District1 shared ZIP area

Where this district sits

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: in 7 of the 7 ZIP Code areas Sewanhaka Central High reaches, at least one other district holds a real share of the homes as well, and the line between 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.

Where these numbers come from

School district boundaries come from the Census Bureau's Census Geographic Relationship File, current 2026 vintage, which assigns every census block to a unified district or to an elementary and a secondary district. Homes and residents in each block come from the 2020 Census Redistricting Data (PL 94-171), H1_001 and P1_001. The ZIP Code areas come from the same Geographic Relationship File, block to ZIP Code Tabulation Area. District names and grade ranges come from the Census Gazetteer 2025, with 2020 for districts no longer listed.

The place name printed beside a ZIP Code comes from the Census 2020 ZIP Code Tabulation Area relationship files: place, county subdivision and county, taken 2026-09-06. It is a label rather than a measurement: the Census Bureau does not publish which post office a ZIP Code belongs to, so the place named is the one covering the most land inside the area, not the city the Postal Service prints on an envelope.

Everything else on this page — the shares, the counts of districts per ZIP, the comparison between the two grade bands, the rankings — is computed here from those files. The source publishes none of it. Snapshot taken 2026-09-03.