ZIP Code 15531 — Boswell, PA
15531 is a standard (street delivery) ZIP code serving Boswell, Pennsylvania, in Somerset 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 15531 at a glance
| ZIP code | 15531 |
|---|---|
| Primary city | Boswell |
| State | Pennsylvania (PA) |
| County | Somerset FIPS 42111 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 3,603 |
| Coordinates | 40.185370, -79.079400 |
How ZIP+4 works in 15531
The four digits after the hyphen encode a delivery segment inside 15531. 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 15531 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 15531.
| ZIP | City | Distance |
|---|---|---|
| 15547 | Jennerstown, PA | 1.6 mi |
| 15546 | Jenners, PA | 3.7 mi |
| 15544 | Gray, PA | 3.8 mi |
| 15655 | Laughlintown, PA | 5.4 mi |
| 15520 | Acosta, PA | 5.6 mi |
| 15937 | Jerome, PA | 5.6 mi |
| 15935 | Hollsopple, PA | 6 mi |
| 15555 | Quecreek, PA | 6.1 mi |
| 15561 | Sipesville, PA | 6.3 mi |
| 15677 | Rector, PA | 8.4 mi |
| 15658 | Ligonier, PA | 8.9 mi |
| 15905 | Johnstown, PA | 9.1 mi |
Questions about 15531
What is the ZIP+4 code for 15531?
15531 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 15531, you need to look up a specific street address to get them.
What city is 15531?
15531 is assigned to Boswell, Pennsylvania, in Somerset 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.