ZIP Code 85635 · Sierra Vista, Arizona
Cochise County · 17,139 counted · 1 district
32 of the 17,139 homes here have no high school district named in the federal file.
Each percentage here is a share of the 17,139 homes counted in ZIP Code 85635, 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.
One district, Sierra Vista Unified District, is named for ZIP Code 85635, Sierra Vista, Arizona at both levels, and it does not reach every home counted: 32 of the 17,139 homes are named for it at the elementary level and for no secondary district at all. A one-name answer here is right about the name and silent about the part of the area the name does not cover. The largest share is high enough that one name is right for most of the homes counted and wrong for the other 36: 36 homes in districts too small to name here.
One district covers the early grades, and a sliver does not
Sierra Vista Unified District is the only grade school district holding a measurable share of ZIP Code 85635, with 17,103 of the 17,139 homes counted in the area; 3 districts more are named below the half-percent line.
Every track below is 35 cells long and stands for all 17,139 homes counted in ZIP Code 85635, so one cell is 490 homes, rounded to the nearest whole cell. Cells lit solid are the homes one district holds; the hatched cells at the end of a track are homes that no district of that kind is drawn to serve at all.
- Sierra Vista Unified District17,103 of 17,139 homes100%
Below half a percent at the grade school level: Palominas Elementary District, Tombstone Unified District and Fort Huachuca Accommodation District hold 36 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.
One district covers high school, and a sliver does not
Sierra Vista Unified District is the only high school district holding a measurable share of ZIP Code 85635, with 17,103 of the 17,139 homes counted in the area; 2 districts more are named below the half-percent line.
- Sierra Vista Unified District17,103 of 17,139 homes100%
Below half a percent at the high school level: Tombstone Unified District and Fort Huachuca Accommodation District hold 4 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.
One district, and the homes it does not cover
The same district is named at both levels, so nobody changes district at the change of grade. What changes is coverage: 32 homes counted here are named for the early grades and for no secondary district, and for those homes the high school question has no answer in the federal file at all. The town or the district office is the only place that holds it.
What one district name costs in 85635
A lookup that answers ZIP Code 85635 with one district name has to pick one of the names below and drop the rest. Measured against the 17,139 homes counted here, for the early grades it is wrong for 36 homes and for high school it is wrong for 36 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 85635
Sierra Vista Unified reaches 5 ZIP Code areas in all, and 17,103 of its homes are the ones counted here. Each is the only district in at least one other ZIP Code area, which is why a single-name answer works elsewhere and not here.
- Sierra Vista Unified District17,103 of 17,139 here · 5 ZIP areas in all
Where Sierra Vista Unified goes from here
Sierra Vista Unified District runs pre-K through grade 12, and it is the only school district serving 1 of the 5 ZIP Code areas it touches, shares 2 more with neighbors, and holds under half a percent of the homes in the remaining 2. Inside its own boundary it holds 23,397 homes over 108 square miles; the part of it counted in ZIP Code 85635 is 17,103 of those. The district it shares the most postal ground with is Palominas Elementary District, across 2 ZIP Code areas. Its thinnest measured foothold is elsewhere: in ZIP Code area 85615 it holds 440 of 4,308 homes, or 10% of them.
How 85635 compares in Arizona
Across Arizona the boundary file names more than one district in 259 of the 409 ZIP Code areas it names a district for, 63% of them, and 72 areas in the state have no high school district named for part of their homes. Counting the districts named at either level, 259 areas in Arizona name more than this ZIP Code does and 0 name fewer. Nationally more than one district is named in 53% of 33,555 areas.
Look up 85635 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 85635 recomputes the same 17,139 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: 36 of the 17,139 homes counted in 85635 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.