DistrictByZip Every school district that touches your ZIP Code

ZIP Code 91770 · Rosemead, California

Los Angeles County · 17,412 counted · 5 districts

Grade schoolGarvey Elementary School District52%8,969 of 17,412 homes
High schoolAlhambra Unified School District (9-12)52%8,969 of 17,412 homes

Each percentage here is a share of the 17,412 homes counted in ZIP Code 91770, not the chance that any one address is in that district. Enrollment follows the street: two houses on opposite sides of the same road can be in different districts, and only the district office can say which.

The districts named for the early grades in ZIP Code 91770, Rosemead, California are not the districts named for high school, and the set changes in both directions: one district arrives for high school that no elementary answer names, and another runs the early grades and stops. 5 districts hold the 17,412 homes counted here between them, and Garvey Elementary is the largest by homes. The largest share leaves 8,443 homes elsewhere: 8,337 homes with Rosemead Elementary and Montebello Unified and 106 homes in districts too small to name here. Districts holding under half a percent of the homes named at their own level are listed separately below and are not counted in that number.

Three districts share the early grades

3 districts hold a measurable share of ZIP Code 91770 at this level. Garvey Elementary is the largest with 8,969 homes; the smallest of them holds 2,027 homes. Garvey Elementary and Rosemead Elementary are named here for grade school and not for high school.

Every track below is 35 cells long and stands for all 17,412 homes counted in ZIP Code 91770, so one cell is 497 homes, rounded to the nearest whole cell. Cells lit solid are the homes one district holds, and the unlit cells are the homes held by the other districts in the same list.

  • Garvey Elementary School District8,969 of 17,412 homes52%
  • Rosemead Elementary School District6,310 of 17,412 homes36%
  • Montebello Unified School District2,027 of 17,412 homes12%

Below half a percent at the grade school level: El Monte City School District, San Gabriel Unified School District and Valle Lindo Elementary School District hold 106 homes between them, which is why they are counted under the list rather than inside it. A lookup that named them alongside the districts above would be listing a boundary crossing rather than an answer.

Three districts share high school

3 districts hold a measurable share of ZIP Code 91770 at this level. Alhambra Unified School District (9-12) is the largest with 8,969 homes; the smallest of them holds 2,027 homes. Alhambra Unified School District (9-12) and El Monte Union High are named here for high school and not for the early grades.

  • Alhambra Unified School District (9-12)8,969 of 17,412 homes52%
  • El Monte Union High School District6,390 of 17,412 homes37%
  • Montebello Unified School District2,027 of 17,412 homes12%

Below half a percent at the high school level: San Gabriel Unified School District holds 26 homes, which is why it is counted under the list rather than inside it. A lookup that named it alongside the districts above would be listing a boundary crossing rather than an answer.

The set of names changes in both directions

Alhambra Unified School District (9-12) and El Monte Union High are named for high school here and for no elementary grades, and Garvey Elementary and Rosemead Elementary run the early grades and no more. An address on the wrong street can therefore change district at the change of grade and land in a district that was never part of its elementary answer, while a neighbor two blocks away keeps one name the whole way through.

What one district name costs in 91770

A lookup that answers ZIP Code 91770 with one district name has to pick one of the names below and drop the rest. Measured against the 17,412 homes counted here, for the early grades it is wrong for 8,443 homes and for high school it is wrong for 8,443 homes. That is the whole difference between this page and a one-line answer: the same federal file, read to the end instead of to the first row.

The districts that reach into 91770

The districts named above are not alike in size or in reach. El Monte Union High touches 13 ZIP Code areas in all and holds 6,390 homes inside this one; Alhambra Unified School District (9-12) touches 4 areas. Montebello Unified is the only district in at least one ZIP Code area somewhere in the country, while Alhambra Unified School District (9-12) is never the only one anywhere: every postal area it touches, it shares. 1 of them has a page here listing every ZIP Code area it reaches.

Where Garvey Elementary goes from here

Garvey Elementary School District runs kindergarten through grade 8, and it is the only school district serving 0 of the 4 ZIP Code areas it touches, shares 3 more with neighbors, and holds under half a percent of the homes in the remaining 1. Inside its own boundary it holds 15,224 homes over 5 square miles; the part of it counted in ZIP Code 91770 is 8,969 of those. The district it shares the most postal ground with is Alhambra Unified School District (9-12), across 3 ZIP Code areas. Its thinnest measured foothold is elsewhere: in ZIP Code area 91776 it holds 1,804 of 12,674 homes, or 14% of them.

How 91770 compares in California

Across California the boundary file names more than one district in 996 of the 1,788 ZIP Code areas it names a district for, 56% of them, and 3 areas in the state have no high school district named for part of their homes. Counting the districts named at either level, 70 areas in California name more than this ZIP Code does and 1,638 name fewer. Nationally more than one district is named in 53% of 33,555 areas.

Look up 91770 again, or look up another ZIP Code

The lookup holds every ZIP Code area in the country with homes in it, including the ones with no page of their own. Opening it at 91770 recomputes the same 17,412 homes from the same snapshot, and typing five other digits answers for somewhere else. Nothing here is fetched from anywhere while you read: the whole index travels with the lookup page itself.

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: 8,443 of the 17,412 homes counted in 91770 sit outside the district holding the most of them, and the line between the two runs along streets rather than around the postal area.

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.

What this site can hand you instead:

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.