ZIP Code 60559 — Westmont, IL
60559 is a standard (street delivery) ZIP code serving Westmont, 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 60559 at a glance
| ZIP code | 60559 |
|---|---|
| Primary city | Westmont |
| State | Illinois (IL) |
| County | DuPage FIPS 17043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 24,231 |
| Coordinates | 41.794960, -87.974640 |
How ZIP+4 works in 60559
The four digits after the hyphen encode a delivery segment inside 60559. 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 60559 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 60559.
| ZIP | City | Distance |
|---|---|---|
| 60514 | Clarendon Hills, IL | 0.9 mi |
| 60521 | Hinsdale, IL | 2.4 mi |
| 60515 | Downers Grove, IL | 2.8 mi |
| 60516 | Downers Grove, IL | 3 mi |
| 60523 | Oak Brook, IL | 3.1 mi |
| 60561 | Darien, IL | 3.5 mi |
| 60558 | Western Springs, IL | 3.8 mi |
| 60527 | Willowbrook, IL | 4.1 mi |
| 60517 | Woodridge, IL | 5.2 mi |
| 60526 | La Grange Park, IL | 5.3 mi |
| 60525 | La Grange, IL | 5.6 mi |
| 60532 | Lisle, IL | 5.7 mi |
Questions about 60559
What is the ZIP+4 code for 60559?
60559 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 60559, you need to look up a specific street address to get them.
What city is 60559?
60559 is assigned to Westmont, 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.