ZIP Code 27577 — Smithfield, NC
27577 is a standard (street delivery) ZIP code serving Smithfield, North Carolina, in Johnston 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 27577 at a glance
| ZIP code | 27577 |
|---|---|
| Primary city | Smithfield |
| State | North Carolina (NC) |
| County | Johnston FIPS 37101 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 28,354 |
| Coordinates | 35.491660, -78.344600 |
How ZIP+4 works in 27577
The four digits after the hyphen encode a delivery segment inside 27577. 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 27577 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 27577.
| ZIP | City | Distance |
|---|---|---|
| 27568 | Pine Level, NC | 5.9 mi |
| 27593 | Wilsons Mills, NC | 6.6 mi |
| 27524 | Four Oaks, NC | 7 mi |
| 27576 | Selma, NC | 8 mi |
| 27555 | Micro, NC | 9.3 mi |
| 27569 | Princeton, NC | 10.4 mi |
| 27520 | Clayton, NC | 11 mi |
| 27527 | Clayton, NC | 11.7 mi |
| 27504 | Benson, NC | 11.7 mi |
| 27542 | Kenly, NC | 14.5 mi |
| 27529 | Garner, NC | 17.2 mi |
| 27530 | Goldsboro, NC | 17.4 mi |
Questions about 27577
What is the ZIP+4 code for 27577?
27577 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 27577, you need to look up a specific street address to get them.
What city is 27577?
27577 is assigned to Smithfield, North Carolina, in Johnston 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.