ZIP Code 15551 — Markleton, PA
15551 is a standard (street delivery) ZIP code serving Markleton, 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 15551 at a glance
| ZIP code | 15551 |
|---|---|
| Primary city | Markleton |
| State | Pennsylvania (PA) |
| County | Somerset FIPS 42111 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 609 |
| Coordinates | 39.884130, -79.267610 |
How ZIP+4 works in 15551
The four digits after the hyphen encode a delivery segment inside 15551. 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 15551 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 15551.
| ZIP | City | Distance |
|---|---|---|
| 15557 | Rockwood, PA | 4.3 mi |
| 15424 | Confluence, PA | 5.9 mi |
| 15540 | Fort Hill, PA | 6.3 mi |
| 15464 | Mill Run, PA | 9.4 mi |
| 15542 | Garrett, PA | 10.1 mi |
| 15411 | Addison, PA | 10.3 mi |
| 15502 | Hidden Valley, PA | 10.5 mi |
| 15622 | Champion, PA | 10.8 mi |
| 15565 | West Salisbury, PA | 11.8 mi |
| 15469 | Normalville, PA | 12 mi |
| 15446 | Indian Head, PA | 12.2 mi |
| 15562 | Springs, PA | 12.5 mi |
Questions about 15551
What is the ZIP+4 code for 15551?
15551 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 15551, you need to look up a specific street address to get them.
What city is 15551?
15551 is assigned to Markleton, 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.