ZIP Code 15661 — Loyalhanna, PA
15661 is a standard (street delivery) ZIP code serving Loyalhanna, Pennsylvania, in Westmoreland 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 15661 at a glance
| ZIP code | 15661 |
|---|---|
| Primary city | Loyalhanna |
| State | Pennsylvania (PA) |
| County | Westmoreland FIPS 42129 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 858 |
| Coordinates | 40.321920, -79.360070 |
How ZIP+4 works in 15661
The four digits after the hyphen encode a delivery segment inside 15661. 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 15661 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 15661.
| ZIP | City | Distance |
|---|---|---|
| 15620 | Bradenville, PA | 1.1 mi |
| 15696 | Youngstown, PA | 2.9 mi |
| 15671 | New Derry, PA | 3.3 mi |
| 15627 | Derry, PA | 3.4 mi |
| 15650 | Latrobe, PA | 3.6 mi |
| 15638 | Hostetter, PA | 4.5 mi |
| 15693 | Whitney, PA | 5.6 mi |
| 15662 | Luxor, PA | 6.4 mi |
| 15624 | Crabtree, PA | 6.6 mi |
| 15670 | New Alexandria, PA | 7 mi |
| 15619 | Bovard, PA | 7.2 mi |
| 15635 | Hannastown, PA | 7.5 mi |
Questions about 15661
What is the ZIP+4 code for 15661?
15661 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 15661, you need to look up a specific street address to get them.
What city is 15661?
15661 is assigned to Loyalhanna, Pennsylvania, in Westmoreland 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.