ZIP Code 28577 — Sealevel, NC
28577 is a standard (street delivery) ZIP code serving Sealevel, North Carolina, in Carteret 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 28577 at a glance
| ZIP code | 28577 |
|---|---|
| Primary city | Sealevel |
| State | North Carolina (NC) |
| County | Carteret FIPS 37031 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 318 |
| Coordinates | 34.914940, -76.407690 |
How ZIP+4 works in 28577
The four digits after the hyphen encode a delivery segment inside 28577. 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 28577 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 28577.
| ZIP | City | Distance |
|---|---|---|
| 28511 | Atlantic, NC | 3.3 mi |
| 28520 | Cedar Island, NC | 3.5 mi |
| 28581 | Stacy, NC | 4.7 mi |
| 28579 | Smyrna, NC | 9.4 mi |
| 28524 | Davis, NC | 9.5 mi |
| 28589 | Williston, NC | 9.7 mi |
| 28516 | Beaufort, NC | 12.4 mi |
| 28553 | Marshallberg, NC | 14 mi |
| 28528 | Gloucester, NC | 14.4 mi |
| 28531 | Harkers Island, NC | 17.2 mi |
| 28571 | Oriental, NC | 20.4 mi |
| 28556 | Merritt, NC | 20.6 mi |
Questions about 28577
What is the ZIP+4 code for 28577?
28577 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 28577, you need to look up a specific street address to get them.
What city is 28577?
28577 is assigned to Sealevel, North Carolina, in Carteret 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.