ZIP Code 60523 — Oak Brook, IL
60523 is a standard (street delivery) ZIP code serving Oak Brook, Illinois, in DuPage County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 60523 at a glance
| ZIP code | 60523 |
|---|---|
| Primary city | Oak Brook |
| State | Illinois (IL) |
| County | DuPage FIPS 17043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 10,144 |
| Coordinates | 41.837130, -87.954060 |
How ZIP+4 works in 60523
The four digits after the hyphen encode a delivery segment inside 60523. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 60523 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 60523.
| ZIP | City | Distance |
|---|---|---|
| 60514 | Clarendon Hills, IL | 2.8 mi |
| 60521 | Hinsdale, IL | 2.9 mi |
| 60181 | Villa Park, IL | 3 mi |
| 60559 | Westmont, IL | 3.1 mi |
| 60154 | Westchester, IL | 3.4 mi |
| 60162 | Hillside, IL | 3.4 mi |
| 60558 | Western Springs, IL | 3.7 mi |
| 60526 | La Grange Park, IL | 3.7 mi |
| 60515 | Downers Grove, IL | 4.1 mi |
| 60126 | Elmhurst, IL | 4.1 mi |
| 60163 | Berkeley, IL | 4.2 mi |
| 60148 | Lombard, IL | 4.2 mi |
Questions about 60523
What is the ZIP+4 code for 60523?
60523 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 60523, you need to look up a specific street address to get them.
What city is 60523?
60523 is assigned to Oak Brook, Illinois, in DuPage County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.