School districts in Illinois
Illinois splits the two grade bands between separate districts over a large part of the state: 36% of its homes sit under an elementary district that stops before high school, with a separate secondary district taking over from there. That is why 458 of its 1,394 ZIP Code areas return a different set of districts for grade school than for high school. In 60411 (Chicago Heights), the most divided of them, Chicago Heights School District 170 leads the elementary answer and Bloom Township High School District 206 leads the high school one. The two districts that share the most ZIP Codes here are Township High School District 211 and Schaumburg Community Consolidated School District 54, in 10 of them.
Two districts at one address
Illinois keeps 105 separate secondary districts — districts that pick students up partway through and run to the end of high school, over several elementary districts at once. Where one of those sits, an address has two district names and neither is wrong.
- ZIP Code areas with a district1,394
- Served by more than one district1,034 (74%)
- Grade school and high school differ458 (33%)
- No high school district named2
- Unified districts386
- Elementary districts371
- Secondary districts105
- Homes in no district at all0
The largest districts in Illinois
Chicago Public School District 299 dominates the state: at 1,262,604 homes it holds more than three times what Township High School District 214 does in second place. A district that size sets the answer for dozens of ZIP Code areas at once, and the areas it covers alone are counted on its own page rather than assumed from its size.
- School District U-4682,947 homes · 15 ZIP areas
- Glenbard Township High School District 8764,318 homes · 11 ZIP areas
- Springfield School District 18656,680 homes · 9 ZIP areas
- Community High School District 9948,154 homes · 11 ZIP areas
- Bremen Community High School District 22835,997 homes · 12 ZIP areas
- Valley View Community Unit School District 365U31,067 homes · 8 ZIP areas
- Hinsdale Township High School District 8630,954 homes · 9 ZIP areas
The most divided ZIP Code area in Illinois
ZIP Code area 60411 is the most divided in Illinois: 13 districts reach into its 20,910 homes, led for the early grades by Chicago Heights School District 170 and Community Consolidated School District 168. No single name describes this postal code, and no lookup that gives one is telling the whole truth about it.
Each percentage here is a share of the 20,910 homes counted in ZIP Code 60411, 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.
Every track below is 35 cells long and stands for all 20,910 homes counted in ZIP Code 60411, so one cell is 597 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.
- Chicago Heights School District 1708,656 of 20,910 homes41%
- Community Consolidated School District 1683,622 of 20,910 homes17%
- Sunnybrook School District 1712,297 of 20,910 homes11%
- Flossmoor School District 1611,601 of 20,910 homes7.7%
- Sandridge School District 1721,599 of 20,910 homes7.6%
- Steger School District 1941,091 of 20,910 homes5.2%
- Brookwood School District 167955 of 20,910 homes4.6%
- Ford Heights School District 169690 of 20,910 homes3.3%
- Park Forest School District 163399 of 20,910 homes1.9%
For grade school, an answer of one district name would be wrong for 12,254 of the 20,910 here.
How much of Illinois a single district name misses
Across the 1,394 ZIP Code areas in Illinois with homes in them, an answer of one district name misses 837,874 of the 5,426,396 homes they hold — 15% of the state. In 338 of those areas the single name is the whole truth; in the other 1,056 it is not.
ZIP Code 60056 · Mount Prospect, Illinois names 7 districts. Community Consolidated School District 59 is the largest of them for grade school, and an answer of its name alone misses 14,201 of the 22,975 homes there; Township High School District 214, Mount Prospect School District 57 and River Trails School District 26 hold the rest.
ZIP Code 60411 · Chicago Heights, Illinois names 13 districts. Chicago Heights School District 170 is the largest of them for grade school, and an answer of its name alone misses 12,254 of the 20,910 homes there; Bloom Township High School District 206, Community Consolidated School District 168 and Sunnybrook School District 171 hold the rest.
ZIP Code 60402 · Berwyn, Illinois names 4 districts. Berwyn South School District 100 is the largest of them for grade school, and an answer of its name alone misses 12,195 of the 23,665 homes there; J. Sterling Morton High School District 201, Berwyn North School District 98 and Lyons School District 103 hold the rest.
Where a ZIP Code here names more than one district
Of the 1,394 ZIP Code areas in Illinois that the federal file names a district for, 1,034 name more than one school district. These are the 12 with the most, starting at 13 districts in one postal area: Chicago Heights, Mount Vernon and Centralia. Each row opens the full answer for that ZIP Code, with every district named for grade school and for high school and the share of the homes each one holds.
- ZIP Code 60411 · Chicago Heights, Illinois13 districts · 20,910 homes · two bands, two answers
- ZIP Code 62864 · Mount Vernon, Illinois13 districts · 11,152 homes · two bands, two answers
- ZIP Code 62801 · Centralia, Illinois12 districts · 9,240 homes · two bands, two answers
- ZIP Code 60046 · Lake Villa, Illinois10 districts · 12,977 homes · two bands, two answers
- ZIP Code 60523 · Oak Brook, Illinois10 districts · 4,781 homes · two bands, two answers
- ZIP Code 62830 · Dix, Illinois10 districts · 665 homes · two bands, two answers
- ZIP Code 60025 · Glenview, Illinois9 districts · 16,227 homes · two bands, two answers
- ZIP Code 60062 · Northbrook, Illinois9 districts · 17,583 homes · two bands, two answers
- ZIP Code 60073 · Round Lake, Illinois9 districts · 20,095 homes · two bands, two answers
- ZIP Code 60015 · Deerfield, Illinois9 districts · 10,461 homes · two bands, two answers
- ZIP Code 60424 · Gardner, Illinois9 districts · 960 homes · two bands, two answers
- ZIP Code 60450 · Morris, Illinois9 districts · 9,062 homes · two bands, two answers
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: 1,034 of the 1,394 ZIP Code areas in Illinois with a district named for them are served by more than one school district, and the line between two of 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.