ZIP Code 16421 — Harborcreek, PA
16421 is a standard (street delivery) ZIP code serving Harborcreek, Pennsylvania, in Erie 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 16421 at a glance
| ZIP code | 16421 |
|---|---|
| Primary city | Harborcreek |
| State | Pennsylvania (PA) |
| County | Erie FIPS 42049 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,289 |
| Coordinates | 42.170360, -79.935100 |
How ZIP+4 works in 16421
The four digits after the hyphen encode a delivery segment inside 16421. 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 16421 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 16421.
| ZIP | City | Distance |
|---|---|---|
| 16511 | Erie, PA | 3.2 mi |
| 16510 | Erie, PA | 4.2 mi |
| 16563 | Erie, PA | 4.4 mi |
| 16428 | North East, PA | 5.4 mi |
| 16503 | Erie, PA | 7.1 mi |
| 16504 | Erie, PA | 7.2 mi |
| 16546 | Erie, PA | 7.6 mi |
| 16550 | Erie, PA | 8.1 mi |
| 16507 | Erie, PA | 8.1 mi |
| 16501 | Erie, PA | 8.6 mi |
| 16502 | Erie, PA | 9.4 mi |
| 16509 | Erie, PA | 9.5 mi |
Questions about 16421
What is the ZIP+4 code for 16421?
16421 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 16421, you need to look up a specific street address to get them.
What city is 16421?
16421 is assigned to Harborcreek, Pennsylvania, in Erie 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.