Community High School District 99

It never has a ZIP Code to itself

At 1,559 homes to the square mile this is city territory, and district lines in a city follow streets. Community High School District 99 covers 31 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 boundary48,154
• Residents112,178
• ZIP Code areas it reaches11
• Where it is the only district0
• Where it shares with another district8
• Where it holds under half a percent3
• Land area31 square miles
• Homes per square mile1,559

The ZIP Code areas it reaches

The spread is the thing to notice. In 60516 this district holds 95% of the homes; in 60540 it holds 1 home, under half a percent. 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 60516 · Downers Grove, Illinois95% of the homes
• ZIP Code 60517 · Woodridge, Illinois93% of the homes
• ZIP Code 60515 · Downers Grove, Illinois93% of the homes
• ZIP Code 60559 · Westmont, Illinois46% of the homes
• ZIP Code 60561 · Darien, Illinois34% of the homes
• ZIP Code 60523 · Oak Brook, Illinois20% of the homes
• ZIP Code 60532 · Lisle, Illinois20% of the homes
• ZIP Code 60440 · Bolingbrook, Illinois2.8% of the homes
• ZIP Code 60565 · Naperville, Illinois45 homes, under half a percent
• ZIP Code 60148 · Lombard, Illinois20 homes, under half a percent
• ZIP Code 60540 · Naperville, Illinois1 home, under half a percent

The areas it leads without holding most of the homes

Community High School District 99 is the largest district in 4 ZIP Code areas, and not one of them is wholly its own for high school. Answer with its name alone and the high school answer misses 8,361 of the 48,944 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.

Community High School District 99 is the largest name in ZIP Code 60559 · Westmont, Illinois and still holds a minority of it: 4,949 of 10,807 homes. The other 5,858 homes are with Westmont Community Unit School District 201 and Hinsdale Township High School District 86. This is the shape that makes a one-name answer worst — the name is right for fewer homes than it is wrong for.

Community High School District 99 holds 12,702 of the 13,657 homes in ZIP Code 60517 · Woodridge, Illinois, so its name is the right high school answer for most of the area and the wrong one for the rest: 943 homes with Lemont Township High School District 210 and Naperville Community Unit District 203; 12 homes in a district too small to name here.

In ZIP Code 60515 · Downers Grove, Illinois the split runs 11,618 to 928 and the larger part is Community High School District 99's: the rest is 884 homes with Lisle Community Unit School District 202 and Glenbard Township High School District 87; 44 homes in a district too small to name here.

In ZIP Code 60561 · Darien, Illinois this district is one name among 8. Hinsdale Township High School District 86 leads with the largest share and Community High School District 99 holds 3,336 of the 9,798 homes counted there; no single name describes that area at all.

ZIP Code 60532 · Lisle, Illinois repeats the pattern with 4 names holding a real share: 2,690 of its 13,476 homes are Community High School District 99's, and the other 10,786 are not.

Community High School District 99 is not the name anyone would give for ZIP Code 60440 · Bolingbrook, Illinois — Valley View Community Unit School District 365U leads it — and Community High School District 99 holds 505 homes there all the same. Answer that area with one name and that is what it is wrong about.

The elementary districts that feed it

Students arrive at Community High School District 99 from 6 districts that run the lower grades in the same ZIP Code areas — Downers Grove Grade School District 58, which sends 43%, Woodridge School District 68, which sends 30% and Center Cass School District 66, which sends 7.2%. An address on that ground belongs to two districts at once, one for grade school and this one for high school, and neither name is the whole answer.

• Downers Grove Grade School District 5843% of Community High School District 99's homes come from here
• Woodridge School District 6830% of Community High School District 99's homes come from here
• Center Cass School District 667.2% of Community High School District 99's homes come from here
• Darien School District 616.8% of Community High School District 99's homes come from here
• Maercker School District 606.7% of Community High School District 99's homes come from here
• Cass School District 632.0% of Community High School District 99's homes come from here

This list is an estimate, names as well as percentages. The snapshot behind this site keeps the homes each district holds in each ZIP Code area, not the pair of districts on each census block, so a district is listed here when it runs the other band in a ZIP Code area this one shares, and each percentage spreads that area's homes across those districts in proportion to the share each holds there. Unified districts are left out: a block in a unified district belongs to no elementary or secondary district. Read the percentages as the size of the crossing, not as a count of houses.

Who it shares ZIP Codes with

Community High School District 99 shares ZIP Code areas with 21 different districts. The most frequent are Downers Grove Grade School District 58, Woodridge School District 68, Lemont-Bromberek Combined School District 113A and Center Cass School District 66. 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.

• Downers Grove Grade School District 585 shared ZIP areas
• Woodridge School District 684 shared ZIP areas
• Lemont-Bromberek Combined School District 113A3 shared ZIP areas
• Center Cass School District 663 shared ZIP areas
• Hinsdale Township High School District 863 shared ZIP areas
• Darien School District 613 shared ZIP areas

Community High School District 99 and Downers Grove Grade School District 58 school district boundary: the ZIP Codes they share

• ZIP Code 60515 · Downers Grove, Illinois
• ZIP Code 60516 · Downers Grove, Illinois
• ZIP Code 60517 · Woodridge, Illinois
• ZIP Code 60523 · Oak Brook, Illinois
• ZIP Code 60559 · Westmont, Illinois

Community High School District 99 and Woodridge School District 68 school district boundary: the ZIP Codes they share

• ZIP Code 60440 · Bolingbrook, Illinois
• ZIP Code 60516 · Downers Grove, Illinois
• ZIP Code 60517 · Woodridge, Illinois
• ZIP Code 60532 · Lisle, Illinois

Community High School District 99 and Lemont-Bromberek Combined School District 113A school district boundary: the ZIP Codes they share

• ZIP Code 60516 · Downers Grove, Illinois
• ZIP Code 60517 · Woodridge, Illinois
• ZIP Code 60561 · Darien, Illinois

Have a street address?

A ZIP Code names every district that can serve the area; a street address settles which one serves a home. The Census Bureau geocoder takes an exact address and returns its school districts from the current boundary files, free and with no account.

Check an exact address with the Census Geocoder

Where this district sits

• School districts in Illinois1,034 of 1,394 ZIP areas split
• How to find your school district numberNCES ID 1712570

What to do next

Ask the district office to confirm your street address: look on its site for a school locator, a find my school tool or an attendance zone map, or call the office.

A ZIP Code is a set of mail delivery routes, not a boundary: in 8 of the 11 ZIP Code areas Community High School District 99 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.

District websites and phone numbers here come from the NCES Common Core of Data directory, 2024-25 school year, filed under the same district ID as the Census boundary files. Where it lists no usable website, none is printed rather than guessed.

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.

Where these numbers come from

The homes were counted in the 2020 Census and the district lines are the 2026 boundary file, so a fast-growing area may have changed since; ZIP Codes here are the Census Bureau's ZIP Code Tabulation Areas; a share is a share of homes, not the chance that one address is in a district; and a district is not a school attendance zone. Every source, file and caveat is on the method page.