ZIP Code 62239 — Dupo, IL
62239 is a standard (street delivery) ZIP code serving Dupo, Illinois, in St. Clair 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 62239 at a glance
| ZIP code | 62239 |
|---|---|
| Primary city | Dupo |
| State | Illinois (IL) |
| County | St. Clair FIPS 17163 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 4,232 |
| Coordinates | 38.528000, -90.180300 |
How ZIP+4 works in 62239
The four digits after the hyphen encode a delivery segment inside 62239. 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 62239 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 62239.
| ZIP | City | Distance |
|---|---|---|
| 62240 | East Carondelet, IL | 1.7 mi |
| 62206 | East Saint Louis, IL | 2.8 mi |
| 63111 | Saint Louis, MO | 4.3 mi |
| 62207 | East Saint Louis, IL | 4.8 mi |
| 63118 | Saint Louis, MO | 5.1 mi |
| 63116 | Saint Louis, MO | 5.8 mi |
| 63104 | Saint Louis, MO | 6 mi |
| 63125 | Saint Louis, MO | 6.1 mi |
| 62205 | East Saint Louis, IL | 6.2 mi |
| 62260 | Millstadt, IL | 6.4 mi |
| 62223 | Belleville, IL | 6.5 mi |
| 62236 | Columbia, IL | 6.7 mi |
Questions about 62239
What is the ZIP+4 code for 62239?
62239 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 62239, you need to look up a specific street address to get them.
What city is 62239?
62239 is assigned to Dupo, Illinois, in St. Clair 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.