ZIP Code 15143 — Sewickley, PA
15143 is a standard (street delivery) ZIP code serving Sewickley, 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 15143 at a glance
| ZIP code | 15143 |
|---|---|
| Primary city | Sewickley |
| State | Pennsylvania (PA) |
| County | Allegheny FIPS 42003 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 21,851 |
| Coordinates | 40.572980, -80.147250 |
How ZIP+4 works in 15143
The four digits after the hyphen encode a delivery segment inside 15143. 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 15143 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 15143.
| ZIP | City | Distance |
|---|---|---|
| 15056 | Leetsdale, PA | 3.5 mi |
| 15003 | Ambridge, PA | 4 mi |
| 15046 | Crescent, PA | 4.4 mi |
| 15081 | South Heights, PA | 4.7 mi |
| 15225 | Pittsburgh, PA | 5 mi |
| 15005 | Baden, PA | 5.1 mi |
| 15237 | Pittsburgh, PA | 5.5 mi |
| 15090 | Wexford, PA | 5.5 mi |
| 15015 | Bradfordwoods, PA | 5.6 mi |
| 15108 | Coraopolis, PA | 5.7 mi |
| 15202 | Pittsburgh, PA | 6.2 mi |
| 15229 | Pittsburgh, PA | 6.8 mi |
Questions about 15143
What is the ZIP+4 code for 15143?
15143 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 15143, you need to look up a specific street address to get them.
What city is 15143?
15143 is assigned to Sewickley, 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.