ZIP Code 62539 — Illiopolis, IL
62539 is a standard (street delivery) ZIP code serving Illiopolis, Illinois, in Sangamon 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 62539 at a glance
| ZIP code | 62539 |
|---|---|
| Primary city | Illiopolis |
| State | Illinois (IL) |
| County | Sangamon FIPS 17167 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,412 |
| Coordinates | 39.866810, -89.249140 |
How ZIP+4 works in 62539
The four digits after the hyphen encode a delivery segment inside 62539. 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 62539 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 62539.
| ZIP | City | Distance |
|---|---|---|
| 62551 | Niantic, IL | 5 mi |
| 62515 | Buffalo, IL | 6.2 mi |
| 62547 | Mount Auburn, IL | 6.8 mi |
| 62548 | Mount Pulaski, IL | 7.9 mi |
| 62537 | Harristown, IL | 8.3 mi |
| 62519 | Cornland, IL | 8.8 mi |
| 62543 | Latham, IL | 8.8 mi |
| 62541 | Lake Fork, IL | 8.9 mi |
| 62545 | Mechanicsburg, IL | 10.1 mi |
| 62573 | Warrensburg, IL | 10.8 mi |
| 62522 | Decatur, IL | 11 mi |
| 62513 | Blue Mound, IL | 11.1 mi |
Questions about 62539
What is the ZIP+4 code for 62539?
62539 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 62539, you need to look up a specific street address to get them.
What city is 62539?
62539 is assigned to Illiopolis, Illinois, in Sangamon 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.