Mapleton School District 1

It never has a ZIP Code to itself

At 1,014 homes to the square mile this is city territory, and district lines in a city follow streets. Mapleton School District 1 covers 12 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 boundary12,122
• Residents34,294
• ZIP Code areas it reaches4
• Where it is the only district0
• Where it shares with another district4
• Where it holds under half a percent0
• Land area12 square miles
• Homes per square mile1,014

The ZIP Code areas it reaches

Every one of the 4 areas where it holds a real share it shares with somebody. Its largest foothold is 80229 at 46% of the homes; the thinnest is 80216, where it holds 2.3% of the homes.

• ZIP Code 80229 · Thornton, Colorado46% of the homes
• ZIP Code 80221 · Berkley, Colorado18% of the homes
• ZIP Code 80233 · Thornton, Colorado2.5% of the homes
• ZIP Code 80216 · Denver, Colorado2.3% of the homes

The areas it leads without holding most of the homes

Mapleton School District 1 is the largest district in 1 ZIP Code area, and not one of them is wholly its own. Answer with its name alone and the answer misses 10,369 of the 19,223 homes those areas hold. That count is computed here from census blocks; the lookups that answer this question with a single name never print it.

Mapleton School District 1 is the largest name in ZIP Code 80229 · Thornton, Colorado and still holds a minority of it: 8,854 of 19,223 homes. The other 10,369 homes are with Adams 12 Five Star Schools and Adams County School District 14. This is the shape that makes a one-name answer worst — the name is right for fewer homes than it is wrong for.

In ZIP Code 80221 · Berkley, Colorado this district is one name among 4. Westminster Public leads with the largest share and Mapleton School District 1 holds 2,667 of the 15,097 homes counted there; no single name describes that area at all.

Mapleton School District 1 is not the name anyone would give for ZIP Code 80233 · Thornton, Colorado — Adams 12 Five Star Schools leads it — and Mapleton School District 1 holds 456 homes there all the same. Answer that area with one name and that is what it is wrong about.

ZIP Code 80216 · Denver, Colorado is another area where Mapleton School District 1 is present without being the answer: 145 of its 6,300 homes, behind Denver County School District 1.

Who takes the other homes in its ZIP Codes

Mapleton School District 1 runs pre-K through grade 12 itself, so an address it holds sees no change of authority between grade school and high school. The districts listed below are the ones that take the other homes in the ZIP Code areas it shares — Adams 12 Five Star Schools, Westminster Public and Denver County School District 1. They are neighbors on the same postal ground, not the next stop for its own students.

• Adams 12 Five Star Schools26,131 homes in 3 shared ZIP Code areas
• Westminster Public School District9,333 homes in 1 shared ZIP Code area
• Denver County School District 18,482 homes in 2 shared ZIP Code areas
• Adams County School District 142,661 homes in 2 shared ZIP Code areas

Who it shares ZIP Codes with

These districts appear alongside Mapleton School District 1 in the same ZIP Code areas: Adams 12 Five Star Schools, Adams County School District 14, Denver County School District 1 and Westminster Public. A single-name lookup for one of those areas has to choose between them, and the choice is right for some addresses and wrong for others.

• Adams 12 Five Star Schools3 shared ZIP areas
• Adams County School District 142 shared ZIP areas
• Denver County School District 12 shared ZIP areas
• Westminster Public School District1 shared ZIP area

Where this district sits

• School districts in Colorado234 of 520 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 4 of the 4 ZIP Code areas Mapleton School District 1 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.