ZIP Code 60440 · Bolingbrook, Illinois
Will County · 17,866 counted · 4 districts
Each percentage here is a share of the 17,866 homes counted in ZIP Code 60440, 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.
The districts named for the early grades in ZIP Code 60440, Bolingbrook, Illinois are not the districts named for high school, and the set changes in both directions: one district arrives for high school that no elementary answer names, and another runs the early grades and stops. 4 districts hold the 17,866 homes counted here between them, and Valley View Community Unit School District 365U is the largest by homes. The largest share is high enough that one name is right for most of the homes counted and wrong for the other 826: 826 homes with Woodridge School District 68 and Naperville Community Unit District 203.
Three districts share the early grades
3 districts hold a measurable share of ZIP Code 60440 at this level. Valley View Community Unit School District 365U is the largest with 17,040 homes; the smallest of them holds 321 homes. Woodridge School District 68 is named here for grade school and not for high school.
Every track below is 35 cells long and stands for all 17,866 homes counted in ZIP Code 60440, so one cell is 510 homes, rounded to the nearest whole cell. Cells lit solid are the homes one district holds, and the unlit cells are the homes held by the other districts in the same list.
- Valley View Community Unit School District 365U17,040 of 17,866 homes95%
- Woodridge School District 68505 of 17,866 homes2.8%
- Naperville Community Unit District 203321 of 17,866 homes1.8%
Plainfield School District 202 reaches into ZIP Code 60440 at the grade school level and holds no home counted in it: the boundary crosses the postal area without picking up a single one.
Three districts share high school
3 districts hold a measurable share of ZIP Code 60440 at this level. Valley View Community Unit School District 365U is the largest with 17,040 homes; the smallest of them holds 321 homes. Community High School District 99 is named here for high school and not for the early grades.
- Valley View Community Unit School District 365U17,040 of 17,866 homes95%
- Community High School District 99505 of 17,866 homes2.8%
- Naperville Community Unit District 203321 of 17,866 homes1.8%
Plainfield School District 202 reaches into ZIP Code 60440 at the high school level and holds no home counted in it: the boundary crosses the postal area without picking up a single one.
The set of names changes in both directions
Community High School District 99 is named for high school here and for no elementary grades, and Woodridge School District 68 runs the early grades and no more. An address on the wrong street can therefore change district at the change of grade and land in a district that was never part of its elementary answer, while a neighbor two blocks away keeps one name the whole way through.
What one district name costs in 60440
A lookup that answers ZIP Code 60440 with one district name has to pick one of the names below and drop the rest. Measured against the 17,866 homes counted here, for the early grades it is wrong for 826 homes and for high school it is wrong for 826 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 60440
The districts named above are not alike in size or in reach. Community High School District 99 touches 11 ZIP Code areas in all and holds 505 homes inside this one; Woodridge School District 68 touches 6 areas. Not one of them is ever the only district in a ZIP Code area anywhere in the country: every postal area they touch, they share with somebody. 2 of them have a page here listing every ZIP Code area it reaches.
- Valley View Community Unit School District 365U17,040 of 17,866 here · 8 ZIP areas in all
- Community High School District 99505 of 17,866 here · 11 ZIP areas in all
- Woodridge School District 68505 of 17,866 here · 6 ZIP areas in all
- Naperville Community Unit District 203321 of 17,866 here · 7 ZIP areas in all
Where Valley View Community Unit School District 365U goes from here
Valley View Community Unit School District 365U runs pre-K through grade 12, and it is the only school district serving 0 of the 8 ZIP Code areas it touches, shares 5 more with neighbors, and holds under half a percent of the homes in the remaining 3. Inside its own boundary it holds 31,067 homes over 38 square miles; the part of it counted in ZIP Code 60440 is 17,040 of those. The district it shares the most postal ground with is Plainfield School District 202, across 3 ZIP Code areas. Its thinnest measured foothold is elsewhere: in ZIP Code area 60439 it holds 51 of 9,203 homes, or 0.6% of them.
How 60440 compares in Illinois
Across Illinois the boundary file names more than one district in 1,034 of the 1,394 ZIP Code areas it names a district for, 74% of them, and 2 areas in the state have no high school district named for part of their homes. Counting the districts named at either level, 221 areas in Illinois name more than this ZIP Code does and 999 name fewer. Nationally more than one district is named in 53% of 33,555 areas.
Look up 60440 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 60440 recomputes the same 17,866 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: 826 of the 17,866 homes counted in 60440 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:
- Valley View Community Unit School District 365U8 ZIP Code areas in all
- How this is worked out4 Census Bureau files
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.