ZIP Code 60543 — Oswego, IL
60543 is a standard (street delivery) ZIP code serving Oswego, Illinois, in Kendall 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 60543 at a glance
| ZIP code | 60543 |
|---|---|
| Primary city | Oswego |
| State | Illinois (IL) |
| County | Kendall FIPS 17093 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 43,047 |
| Coordinates | 41.665370, -88.324420 |
How ZIP+4 works in 60543
The four digits after the hyphen encode a delivery segment inside 60543. 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 60543 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 60543.
| ZIP | City | Distance |
|---|---|---|
| 60538 | Montgomery, IL | 4.2 mi |
| 60503 | Aurora, IL | 4.6 mi |
| 60585 | Plainfield, IL | 5.2 mi |
| 60512 | Bristol, IL | 6.4 mi |
| 60544 | Plainfield, IL | 6.5 mi |
| 60560 | Yorkville, IL | 6.7 mi |
| 60505 | Aurora, IL | 7 mi |
| 60564 | Naperville, IL | 7.1 mi |
| 60504 | Aurora, IL | 7.1 mi |
| 60506 | Aurora, IL | 7.1 mi |
| 60586 | Plainfield, IL | 8.1 mi |
| 60519 | Eola, IL | 8.8 mi |
Questions about 60543
What is the ZIP+4 code for 60543?
60543 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 60543, you need to look up a specific street address to get them.
What city is 60543?
60543 is assigned to Oswego, Illinois, in Kendall 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.