Phoenix Union High School District

It never has a ZIP Code to itself

At 1,554 homes to the square mile this is city territory, and district lines in a city follow streets. Phoenix Union High covers 174 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 boundary269,957
• Residents722,707
• ZIP Code areas it reaches31
• Where it is the only district0
• Where it shares with another district30
• Where it holds under half a percent1
• Land area174 square miles
• Homes per square mile1,554

The ZIP Code areas it reaches

The spread is the thing to notice. In 85008 this district holds 100% of the homes; in 85026 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.

• ZIP Code 85008 · Phoenix, Arizona100% of the homes
• ZIP Code 85016 · Phoenix, Arizona100% of the homes
• ZIP Code 85041 · Phoenix, Arizona100% of the homes
• ZIP Code 85014 · Phoenix, Arizona100% of the homes
• ZIP Code 85009 · Phoenix, Arizona100% of the homes
• ZIP Code 85006 · Phoenix, Arizona100% of the homes
• ZIP Code 85031 · Phoenix, Arizona100% of the homes
• ZIP Code 85019 · Phoenix, Arizona100% of the homes
• ZIP Code 85004 · Phoenix, Arizona100% of the homes
• ZIP Code 85007 · Phoenix, Arizona100% of the homes
• ZIP Code 85003 · Phoenix, Arizona100% of the homes
• ZIP Code 85012 · Phoenix, Arizona100% of the homes
• ZIP Code 85034 · Phoenix, Arizona100% of the homes
• ZIP Code 85033 · Phoenix, Arizona98% of the homes
• ZIP Code 85339 · Phoenix, Arizona94% of the homes
• ZIP Code 85013 · Phoenix, Arizona92% of the homes
• ZIP Code 85040 · Phoenix, Arizona86% of the homes
• ZIP Code 85035 · Phoenix, Arizona81% of the homes
• ZIP Code 85015 · Phoenix, Arizona78% of the homes
• ZIP Code 85042 · Phoenix, Arizona77% of the homes
• ZIP Code 85017 · Phoenix, Arizona66% of the homes
• ZIP Code 85018 · Phoenix, Arizona51% of the homes
• ZIP Code 85020 · Phoenix, Arizona33% of the homes
• ZIP Code 85043 · Phoenix, Arizona25% of the homes
• ZIP Code 85301 · Glendale, Arizona23% of the homes
• ZIP Code 85253 · Paradise Valley, Arizona5.3% of the homes
• ZIP Code 85257 · Scottsdale, Arizona4.0% of the homes
• ZIP Code 85021 · Phoenix, Arizona3.6% of the homes
• ZIP Code 85051 · Phoenix, Arizona2.7% of the homes
• ZIP Code 85251 · Scottsdale, Arizona0.6% of the homes
• ZIP Code 85026 · Phoenix, Arizonano homes at all

What one name misses, and what changes later

Phoenix Union High is the largest district in 21 ZIP Code areas. Answer with its name alone and the answer misses 28,218 of the 265,843 homes those areas hold — though in 12 of them it holds every home there is. The count is homes, not addresses, and it is the number no lookup prints.

Phoenix Union High holds 10,055 of the 19,872 homes in ZIP Code 85018 · Phoenix, Arizona, so its name is right for most of the area and wrong for the rest: 9,817 homes with Scottsdale Unified.

ZIP Code 85017 · Phoenix, Arizona is a two-district area: 8,503 of its 12,943 homes are inside Phoenix Union High, and the other 4,440 homes are with Glendale Union High. Which one an address belongs to is settled by the street, not by the five digits.

In ZIP Code 85015 · Phoenix, Arizona the split runs 13,537 to 3,868 and the larger part is Phoenix Union High's: the rest is 3,868 homes with Glendale Union High.

In ZIP Code 85339 · Phoenix, Arizona the split runs 13,329 to 876 and the larger part is Phoenix Union High's: the rest is 137 homes with Tolleson Union High, 39 homes in districts too small to name here and 700 homes in no high school district in the federal file.

In ZIP Code 85003 · Phoenix, Arizona the single-name answer is the true one: Phoenix Union High holds all 5,414 homes counted there, and no other district holds a share worth naming.

In ZIP Code 85033 · Phoenix, Arizona this district is one name among 4. Cartwright Elementary leads with the largest share and Phoenix Union High holds 15,857 of the 16,168 homes counted there; no single name describes that area at all.

ZIP Code 85020 · Phoenix, Arizona repeats the pattern with 5 names holding a real share: 5,925 of its 18,034 homes are Phoenix Union High's, and the other 12,109 are not.

Phoenix Union High is not the name anyone would give for ZIP Code 85021 · Phoenix, Arizona — Glendale Union High leads it — and Phoenix Union High holds 645 homes there all the same. Answer that area with one name and that is what it is wrong about.

The elementary districts that feed it

Students arrive at Phoenix Union High from 6 districts that run the lower grades on the same ground — Roosevelt Elementary, which sends 13%, Cartwright Elementary, which sends 11% and Madison Elementary, which sends 11%. 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.

• Roosevelt Elementary District13% of Phoenix Union High's homes come from here
• Cartwright Elementary District11% of Phoenix Union High's homes come from here
• Madison Elementary District11% of Phoenix Union High's homes come from here
• Phoenix Elementary District10% of Phoenix Union High's homes come from here
• Creighton Elementary District8.8% of Phoenix Union High's homes come from here
• Osborn Elementary District8.0% of Phoenix Union 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

Phoenix Union High shares ZIP Code areas with 25 different districts. The most frequent are Osborn Elementary, Phoenix Elementary, Glendale Union High and Madison 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.

• Osborn Elementary District8 shared ZIP areas
• Phoenix Elementary District8 shared ZIP areas
• Glendale Union High School District7 shared ZIP areas
• Madison Elementary District7 shared ZIP areas
• Alhambra Elementary District6 shared ZIP areas
• Washington Elementary District6 shared ZIP areas

Where this district sits

• School districts in Arizona259 of 409 ZIP areas split
• Every district with a page here260 districts listed

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 30 of the 31 ZIP Code areas Phoenix 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.