ZIP Code 15122 — West Mifflin, PA
15122 is a standard (street delivery) ZIP code serving West Mifflin, Pennsylvania, in Allegheny 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 15122 at a glance
| ZIP code | 15122 |
|---|---|
| Primary city | West Mifflin |
| State | Pennsylvania (PA) |
| County | Allegheny FIPS 42003 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 18,816 |
| Coordinates | 40.359760, -79.906280 |
How ZIP+4 works in 15122
The four digits after the hyphen encode a delivery segment inside 15122. 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 15122 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 15122.
| ZIP | City | Distance |
|---|---|---|
| 15034 | Dravosburg, PA | 1 mi |
| 15120 | Homestead, PA | 2.5 mi |
| 15045 | Glassport, PA | 2.6 mi |
| 15207 | Pittsburgh, PA | 3 mi |
| 15110 | Duquesne, PA | 3.1 mi |
| 15133 | Mckeesport, PA | 3.3 mi |
| 15132 | Mckeesport, PA | 3.6 mi |
| 15227 | Pittsburgh, PA | 3.6 mi |
| 15236 | Pittsburgh, PA | 3.8 mi |
| 15104 | Braddock, PA | 3.8 mi |
| 15025 | Clairton, PA | 4.3 mi |
| 15218 | Pittsburgh, PA | 4.5 mi |
Questions about 15122
What is the ZIP+4 code for 15122?
15122 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 15122, you need to look up a specific street address to get them.
What city is 15122?
15122 is assigned to West Mifflin, Pennsylvania, in Allegheny 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.