Helena High School District

It never has a ZIP Code to itself

Helena High covers 1,361 square miles, and the ZIP Code areas inside it are small by comparison. Its 27,267 homes are spread thinly enough that the postal map and the school map have little reason to agree anywhere.

• Homes inside the boundary27,267
• Residents58,629
• ZIP Code areas it reaches11
• Where it is the only district0
• Where it shares with another district9
• Where it holds under half a percent2
• Land area1,361 square miles
• Homes per square mile20

The ZIP Code areas it reaches

The spread is the thing to notice. In 59633 this district holds 100% of the homes; in 59623 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 59633 · Canyon Creek, Montana100% of the homes
• ZIP Code 59640 · Marysville, Montana100% of the homes
• ZIP Code 59625 · Helena, Montana100% of the homes
• ZIP Code 59636 · Helena West Side, Montana15 of 15 homes
• ZIP Code 59601 · Helena, Montana98% of the homes
• ZIP Code 59648 · Milford Colony, Montana98% of the homes
• ZIP Code 59602 · Helena Valley Northeast, Montana89% of the homes
• ZIP Code 59421 · Hardy, Montana13% of the homes
• ZIP Code 59639 · Lincoln, Montana1.9% of the homes
• ZIP Code 59635 · Spokane Creek, Montana7 homes, under half a percent
• ZIP Code 59623 · Helena, Montanano homes at all

What one name misses, and what changes later

Helena High is the largest district in 4 ZIP Code areas. Answer with its name alone and the answer misses 1,450 of the 13,500 homes those areas hold — though in 2 of them it holds every home there is. The count is homes, not addresses, and it is the number no lookup prints.

ZIP Code 59602 · Helena Valley Northeast, Montana is a two-district area: 11,184 of its 12,619 homes are inside Helena High, and the other 1,435 homes are with East Helena K-12. Which one an address belongs to is settled by the street, not by the five digits.

Helena High holds 630 of the 645 homes in ZIP Code 59648 · Milford Colony, Montana, so its name is right for most of the area and wrong for the rest: 15 homes with Augusta High.

In ZIP Code 59633 · Canyon Creek, Montana the single-name answer is the true one: Helena High holds all 168 homes counted there, and no other district holds a share worth naming.

ZIP Code 59640 · Marysville, Montana is another area where one name covers everything — 68 homes, all of them inside Helena High.

Helena High reaches into ZIP Code 59601 · Helena, Montana with 14,949 of its 15,279 homes; 3 districts there hold a real share of it, and Helena Elementary leads them. The familiar answer for that area is one of the others, and it is wrong for those 14,949 homes.

In ZIP Code 59421 · Hardy, Montana this district is one name among 4. Cascade High leads with the largest share and Helena High holds 193 of the 1,469 homes counted there; no single name describes that area at all.

ZIP Code 59625 · Helena, Montana is close to being two districts in equal parts: Helena High holds 32 of its 32 homes and Helena Elementary leads the rest. A lookup that picks the larger name is making a coin-toss look like a fact.

Helena High is not the name anyone would give for ZIP Code 59639 · Lincoln, Montana — Lincoln K-12 Schools leads it — and Helena High holds 21 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 Helena High from 6 districts that run the lower grades on the same ground — Helena Elementary, which sends 88%, East Helena K-12, which sends 5.9% and Trinity Elementary, which sends 3.0%. 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.

• Helena Elementary School District88% of Helena High's homes come from here
• East Helena K-125.9% of Helena High's homes come from here
• Trinity Elementary School District3.0% of Helena High's homes come from here
• Wolf Creek Elementary School District2.3% of Helena High's homes come from here
• Cascade Elementary School District0.6% of Helena High's homes come from here
• Lincoln K-12 Schools0.1% of Helena 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

Helena High shares ZIP Code areas with 9 different districts. The most frequent are Helena Elementary, Trinity Elementary, East Helena K-12 and Wolf Creek 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.

• Helena Elementary School District4 shared ZIP areas
• Trinity Elementary School District4 shared ZIP areas
• East Helena K-122 shared ZIP areas
• Wolf Creek Elementary School District2 shared ZIP areas
• Augusta Elementary School District1 shared ZIP area
• Augusta High School District1 shared ZIP area

Where this district sits

• School districts in Montana313 of 368 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 9 of the 11 ZIP Code areas Helena 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.