ZIP Code 90630 · Cypress, California
Orange County · 16,748 counted · 6 districts
Each percentage here is a share of the 16,748 homes counted in ZIP Code 90630, 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 90630, Cypress, 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. 6 districts hold the 16,748 homes counted here between them, and Anaheim Union High is the largest by homes. The largest share leaves 2,512 homes elsewhere: 2,435 homes with Garden Grove Unified and Los Alamitos Unified and 77 homes in a district 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.
The early grades are divided many ways
5 districts hold a measurable share of ZIP Code 90630 at this level. Cypress Elementary is the largest with 12,627 homes; the smallest of them holds 562 homes. Cypress Elementary, Savanna Elementary and Centralia Elementary are named here for grade school and not for high school.
Every track below is 35 cells long and stands for all 16,748 homes counted in ZIP Code 90630, so one cell is 479 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.
- Cypress Elementary School District12,627 of 16,748 homes75%
- Garden Grove Unified School District1,873 of 16,748 homes11%
- Savanna Elementary School District1,042 of 16,748 homes6.2%
- Centralia Elementary School District567 of 16,748 homes3.4%
- Los Alamitos Unified School District562 of 16,748 homes3.4%
Below half a percent at the grade school level: ABC Unified School District holds 77 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.
Three districts share high school
3 districts hold a measurable share of ZIP Code 90630 at this level. Anaheim Union High is the largest with 14,236 homes; the smallest of them holds 562 homes. Anaheim Union High is named here for high school and not for the early grades.
- Anaheim Union High School District14,236 of 16,748 homes85%
- Garden Grove Unified School District1,873 of 16,748 homes11%
- Los Alamitos Unified School District562 of 16,748 homes3.4%
Below half a percent at the high school level: ABC Unified School District holds 77 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
Anaheim Union High is named for high school here and for no elementary grades, and Centralia Elementary, Cypress Elementary and Savanna 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 90630
A lookup that answers ZIP Code 90630 with one district name has to pick one of the names below and drop the rest. Measured against the 16,748 homes counted here, for the early grades it is wrong for 4,121 homes and for high school it is wrong for 2,512 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 90630
The districts named above are not alike in size or in reach. Anaheim Union High touches 16 ZIP Code areas in all and holds 14,236 homes inside this one; Savanna Elementary touches 4 areas. Garden Grove Unified is the only district in at least one ZIP Code area somewhere in the country, while Anaheim Union High is never the only one anywhere: every postal area it touches, it shares.
- Anaheim Union High School District14,236 of 16,748 here · 16 ZIP areas in all
- Cypress Elementary School District12,627 of 16,748 here · 6 ZIP areas in all
- Garden Grove Unified School District1,873 of 16,748 here · 16 ZIP areas in all
- Savanna Elementary School District1,042 of 16,748 here · 4 ZIP areas in all
- Centralia Elementary School District567 of 16,748 here · 5 ZIP areas in all
- Los Alamitos Unified School District562 of 16,748 here · 7 ZIP areas in all
Where Cypress Elementary goes from here
Cypress Elementary School District runs kindergarten through grade 6, and it is the only school district serving 0 of the 6 ZIP Code areas it touches, shares 4 more with neighbors, and holds under half a percent of the homes in the remaining 2. Inside its own boundary it holds 15,169 homes over 6 square miles; the part of it counted in ZIP Code 90630 is 12,627 of those. The district it shares the most postal ground with is Anaheim Union High School District, across 4 ZIP Code areas. Its thinnest measured foothold is elsewhere: in ZIP Code area 90715 it holds 85 of 6,581 homes, or 1.3% of them.
How 90630 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, 36 areas in California name more than this ZIP Code does and 1,718 name fewer. Nationally more than one district is named in 53% of 33,555 areas.
Look up 90630 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 90630 recomputes the same 16,748 homes from the same snapshot, and typing five other digits answers for somewhere else. No server is asked for the answer: 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: 2,512 of the 16,748 homes counted in 90630 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.