Fort Zumwalt R-II School District

It never has a ZIP Code to itself

The counts below come from the census blocks assigned to Fort Zumwalt R-II, grouped by the ZIP Code area each block falls in. The Census Bureau publishes the blocks; the grouping is computed here, and it is the only place these particular numbers exist.

• Homes inside the boundary45,551
• Residents118,589
• ZIP Code areas it reaches6
• Where it is the only district0
• Where it shares with another district5
• Where it holds under half a percent1
• Land area122 square miles
• Homes per square mile372

The ZIP Code areas it reaches

Every one of the 5 areas where it holds a real share it shares with somebody. Its largest foothold is 63366 at 84% of the homes; the thinnest is 63301, where it holds 44 homes, under half a percent.

• ZIP Code 63366 · O'Fallon, Missouri84% of the homes
• ZIP Code 63376 · St. Peters, Missouri58% of the homes
• ZIP Code 63368 · O'Fallon, Missouri51% of the homes
• ZIP Code 63385 · Wentzville, Missouri8.3% of the homes
• ZIP Code 63304 · Weldon Spring, Missouri1.4% of the homes
• ZIP Code 63301 · St. Charles, Missouri44 homes, under half a percent

What one name misses in the areas it leads

Fort Zumwalt R-II is the largest district in 3 ZIP Code areas, and not one of them is wholly its own. Answer with its name alone and the answer misses 24,582 of the 68,453 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.

Fort Zumwalt R-II holds 17,682 of the 30,463 homes in ZIP Code 63376 · St. Peters, Missouri, so its name is right for most of the area and wrong for the rest: 12,781 homes with Francis Howell R-III and St. Charles R-VI.

In ZIP Code 63368 · O'Fallon, Missouri the split runs 8,582 to 8,336 and the larger part is Fort Zumwalt R-II's: the rest is 8,336 homes with Wentzville R-IV and Francis Howell R-III.

ZIP Code 63366 · O'Fallon, Missouri is a two-district area: 17,607 of its 21,072 homes are inside Fort Zumwalt R-II, and the other 3,465 homes are with Wentzville R-IV. Which one an address belongs to is settled by the street, not by the five digits.

Fort Zumwalt R-II is not the name anyone would give for ZIP Code 63385 · Wentzville, Missouri — Wentzville R-IV leads it — and Fort Zumwalt R-II holds 1,413 homes there all the same. Answer that area with one name and that is what it is wrong about.

ZIP Code 63304 · Weldon Spring, Missouri is another area where Fort Zumwalt R-II is present without being the answer: 223 of its 15,992 homes, behind Francis Howell R-III.

Who takes the other homes in its ZIP Codes

Fort Zumwalt R-II 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 — Francis Howell R-III, Wentzville R-IV and St. Charles R-VI. They are neighbors on the same postal ground, not the next stop for its own students.

• Francis Howell R-III School District30,994 homes in 4 shared ZIP Code areas
• Wentzville R-IV School District23,662 homes in 3 shared ZIP Code areas
• St. Charles R-VI School District18,140 homes in 2 shared ZIP Code areas
• Orchard Farm R-V School District5,666 homes in 1 shared ZIP Code area

Who it shares ZIP Codes with

These districts appear alongside Fort Zumwalt R-II in the same ZIP Code areas: Francis Howell R-III, Wentzville R-IV and St. Charles R-VI. 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.

• Francis Howell R-III School District4 shared ZIP areas
• Wentzville R-IV School District3 shared ZIP areas
• St. Charles R-VI School District1 shared ZIP area

Where this district sits

• School districts in Missouri749 of 1,034 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 5 of the 6 ZIP Code areas Fort Zumwalt R-II 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.