Fond du Lac School District

A few homes at the edge of someone else's ZIP Code

The counts below come from the census blocks assigned to Fond du Lac, 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 boundary24,057
• Residents54,632
• ZIP Code areas it reaches5
• Where it is the only district1
• Where it shares with another district4
• Where it holds under half a percent0
• Land area79 square miles
• Homes per square mile303

The ZIP Code areas it reaches

The spread is the thing to notice. In 54935 this district holds 100% of the homes; in 53019 it holds 0.8% of the homes. 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 54935 · Fond du Lac, Wisconsin100% of the homes
• ZIP Code 54937 · Fond du Lac, Wisconsin48% of the homes
• ZIP Code 53049 · St. Peter, Wisconsin35% of the homes
• ZIP Code 53057 · Mount Calvary, Wisconsin10% of the homes
• ZIP Code 53019 · Eden, Wisconsin0.8% of the homes

The areas it leads without holding most of the homes

Fond du Lac is the largest district in 2 ZIP Code areas. Answer with its name alone and the answer misses 4,662 of the 28,219 homes those areas hold — though in 1 of them it holds every home there is. The count is homes, not addresses, and it is the number no lookup prints.

Fond du Lac is the largest name in ZIP Code 54937 · Fond du Lac, Wisconsin and still holds a minority of it: 4,337 of 8,999 homes. The other 4,662 homes are with North Fond du Lac, Oakfield, Campbellsport and 3 more districts. 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 54935 · Fond du Lac, Wisconsin the single-name answer is the true one: Fond du Lac holds all 19,220 homes counted there, and no other district holds a share worth naming.

Fond du Lac reaches into ZIP Code 53049 · St. Peter, Wisconsin with 430 of its 1,216 homes; 3 districts there hold a real share of it, and New Holstein leads them. The familiar answer for that area is one of the others, and it is wrong for those 430 homes.

ZIP Code 53057 · Mount Calvary, Wisconsin is another area where Fond du Lac is present without being the answer: 64 of its 629 homes, behind New Holstein.

Fond du Lac is not the name anyone would give for ZIP Code 53019 · Eden, Wisconsin — Campbellsport leads it — and Fond du Lac holds 6 homes there all the same. Answer that area with one name and that is what it is wrong about.

Who takes the other homes in its ZIP Codes

Fond du Lac 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 — North Fond du Lac, Campbellsport and New Holstein. They are neighbors on the same postal ground, not the next stop for its own students.

• North Fond du Lac School District3,583 homes in 1 shared ZIP Code area
• Campbellsport School District1,281 homes in 3 shared ZIP Code areas
• New Holstein School District1,262 homes in 3 shared ZIP Code areas
• Oakfield School District336 homes in 1 shared ZIP Code area
• Lomira School District190 homes in 1 shared ZIP Code area
• Rosendale-Brandon School District101 homes in 1 shared ZIP Code area

Who it shares ZIP Codes with

Fond du Lac shares ZIP Code areas with 7 different districts. The most frequent are Campbellsport, New Holstein, Chilton and Lomira. 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.

• Campbellsport School District3 shared ZIP areas
• New Holstein School District3 shared ZIP areas
• Chilton School District1 shared ZIP area
• Lomira School District1 shared ZIP area
• North Fond du Lac School District1 shared ZIP area
• Oakfield School District1 shared ZIP area

Where this district sits

• School districts in Wisconsin600 of 781 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 5 ZIP Code areas Fond du Lac 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.