DistrictByZip Every school district that touches your ZIP Code

Glendale Union High School District

Arizona · runs grade 9 through grade 12

There is no ZIP Code area where Glendale Union High is the only school district serving the homes. It holds a real share in 16 of them and shares every one, with 10 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 2,343 homes to the square mile this is city territory, and district lines in a city follow streets. Glendale Union High covers 59 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 boundary139,139
  • Residents356,629
  • ZIP Code areas it reaches18
  • Where it is the only district0
  • Where it shares with another district16
  • Where it holds under half a percent2
  • Land area59 square miles
  • Homes per square mile2,343

The ZIP Code areas it reaches

The spread is the thing to notice. In 85029 this district holds 100% of the homes; in 85033 it holds no homes at all. Same district, opposite answers, and a lookup that names it without the share tells the second household the same thing as the first.

What one name misses, and what changes later

Glendale Union High is the largest district in 7 ZIP Code areas. Answer with its name alone and the answer misses 23,151 of the 114,097 homes those areas hold — though in 1 of them it holds every home there is. The count is homes, not addresses, and it is the number no lookup prints.

Glendale Union High holds 9,684 of the 18,034 homes in ZIP Code 85020 · Phoenix, Arizona, so its name is right for most of the area and wrong for the rest: 8,350 homes with Phoenix Union High and Paradise Valley Unified.

In ZIP Code 85023 · Phoenix, Arizona the split runs 8,597 to 6,454 and the larger part is Glendale Union High's: the rest is 6,454 homes with Deer Valley Unified and Paradise Valley Unified.

ZIP Code 85302 · Glendale, Arizona is a two-district area: 11,943 of its 16,092 homes are inside Glendale Union High, and the other 4,149 homes are with Peoria Unified. Which one an address belongs to is settled by the street, not by the five digits.

In ZIP Code 85053 · Phoenix, Arizona the split runs 8,749 to 3,107 and the larger part is Glendale Union High's: the rest is 3,107 homes with Deer Valley Unified.

In ZIP Code 85029 · Phoenix, Arizona the single-name answer is the true one: Glendale Union High holds all 18,533 homes counted there, and no other district holds a share worth naming.

In ZIP Code 85301 · Glendale, Arizona this district is one name among 4. Glendale Elementary leads with the largest share and Glendale Union High holds 19,008 of the 24,657 homes counted there; no single name describes that area at all.

ZIP Code 85303 · Glendale, Arizona is close to being two districts in equal parts: Glendale Union High holds 10,074 of its 10,102 homes and Glendale Elementary leads the rest. A lookup that picks the larger name is making a coin-toss look like a fact.

ZIP Code 85017 · Phoenix, Arizona repeats the pattern with 5 names holding a real share: 4,440 of its 12,943 homes are Glendale Union High's, and the other 8,503 are not.

The elementary districts that feed it

Students arrive at Glendale Union High from 6 districts that run the lower grades on the same ground — Washington Elementary, which sends 53%, Glendale Elementary, which sends 23% and Alhambra Elementary, which sends 6.6%. 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.

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

Glendale Union High shares ZIP Code areas with 10 different districts. The most frequent are Washington Elementary, Phoenix Union High, Alhambra Elementary and Glendale Elementary. 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.

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 16 of the 18 ZIP Code areas Glendale Union 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.