ZIP Code 28756 — Mill Spring, NC
28756 is a standard (street delivery) ZIP code serving Mill Spring, North Carolina, in Polk 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 28756 at a glance
| ZIP code | 28756 |
|---|---|
| Primary city | Mill Spring |
| State | North Carolina (NC) |
| County | Polk FIPS 37149 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 4,706 |
| Coordinates | 35.342560, -82.182190 |
How ZIP+4 works in 28756
The four digits after the hyphen encode a delivery segment inside 28756. 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 28756 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 28756.
| ZIP | City | Distance |
|---|---|---|
| 28720 | Chimney Rock, NC | 7 mi |
| 28782 | Tryon, NC | 7.6 mi |
| 28722 | Columbus, NC | 8.1 mi |
| 28746 | Lake Lure, NC | 8.2 mi |
| 28773 | Saluda, NC | 9.6 mi |
| 28710 | Bat Cave, NC | 9.6 mi |
| 28139 | Rutherfordton, NC | 10.4 mi |
| 28792 | Hendersonville, NC | 11 mi |
| 28731 | Flat Rock, NC | 11.6 mi |
| 28735 | Gerton, NC | 13.1 mi |
| 28726 | East Flat Rock, NC | 13.9 mi |
| 29356 | Landrum, SC | 14.4 mi |
Questions about 28756
What is the ZIP+4 code for 28756?
28756 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 28756, you need to look up a specific street address to get them.
What city is 28756?
28756 is assigned to Mill Spring, North Carolina, in Polk 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.