ZIP Code 62258 — Mascoutah, IL
62258 is a standard (street delivery) ZIP code serving Mascoutah, 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 62258 at a glance
| ZIP code | 62258 |
|---|---|
| Primary city | Mascoutah |
| State | Illinois (IL) |
| County | St. Clair FIPS 17163 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 10,437 |
| Coordinates | 38.460140, -89.772870 |
How ZIP+4 works in 62258
The four digits after the hyphen encode a delivery segment inside 62258. 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 62258 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 62258.
| ZIP | City | Distance |
|---|---|---|
| 62265 | New Baden, IL | 6.1 mi |
| 62266 | New Memphis, IL | 6.7 mi |
| 62243 | Freeburg, IL | 6.9 mi |
| 62225 | Scott Air Force Base, IL | 7.1 mi |
| 62221 | Belleville, IL | 7.7 mi |
| 62282 | Saint Libory, IL | 7.8 mi |
| 62215 | Albers, IL | 9.6 mi |
| 62289 | Summerfield, IL | 9.6 mi |
| 62255 | Lenzburg, IL | 10.2 mi |
| 62254 | Lebanon, IL | 10.6 mi |
| 62214 | Addieville, IL | 10.7 mi |
| 62220 | Belleville, IL | 11.6 mi |
Questions about 62258
What is the ZIP+4 code for 62258?
62258 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 62258, you need to look up a specific street address to get them.
What city is 62258?
62258 is assigned to Mascoutah, 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.