ZIP Code 15378 — Westland, PA
15378 is a standard (street delivery) ZIP code serving Westland, Pennsylvania, in Washington 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 15378 at a glance
| ZIP code | 15378 |
|---|---|
| Primary city | Westland |
| State | Pennsylvania (PA) |
| County | Washington FIPS 42125 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Coordinates | 40.277710, -80.274330 |
How ZIP+4 works in 15378
The four digits after the hyphen encode a delivery segment inside 15378. 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 15378 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 15378.
| ZIP | City | Distance |
|---|---|---|
| 15340 | Hickory, PA | 2.6 mi |
| 15342 | Houston, PA | 3.6 mi |
| 15361 | Southview, PA | 3.9 mi |
| 15350 | Muse, PA | 4 mi |
| 15363 | Strabane, PA | 4.4 mi |
| 15347 | Meadow Lands, PA | 4.9 mi |
| 15321 | Cecil, PA | 5.5 mi |
| 15057 | Mcdonald, PA | 5.6 mi |
| 15317 | Canonsburg, PA | 5.8 mi |
| 15060 | Midway, PA | 6.9 mi |
| 15004 | Atlasburg, PA | 7.2 mi |
| 15031 | Cuddy, PA | 7.6 mi |
Questions about 15378
What is the ZIP+4 code for 15378?
15378 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 15378, you need to look up a specific street address to get them.
What city is 15378?
15378 is assigned to Westland, Pennsylvania, in Washington 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.