ZIP Code 29321 — Buffalo, SC
29321 is a standard (street delivery) ZIP code serving Buffalo, South Carolina, in Union 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 29321 at a glance
| ZIP code | 29321 |
|---|---|
| Primary city | Buffalo |
| State | South Carolina (SC) |
| County | Union FIPS 45087 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 3,236 |
| Coordinates | 34.719750, -81.741510 |
How ZIP+4 works in 29321
The four digits after the hyphen encode a delivery segment inside 29321. 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 29321 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 29321.
| ZIP | City | Distance |
|---|---|---|
| 29374 | Pauline, SC | 7.6 mi |
| 29379 | Union, SC | 8.1 mi |
| 29331 | Cross Anchor, SC | 8.5 mi |
| 29353 | Jonesville, SC | 9 mi |
| 29335 | Enoree, SC | 10 mi |
| 29372 | Pacolet, SC | 13 mi |
| 29302 | Spartanburg, SC | 13.3 mi |
| 29376 | Roebuck, SC | 13.5 mi |
| 29373 | Pacolet Mills, SC | 14.1 mi |
| 29306 | Spartanburg, SC | 15.7 mi |
| 29346 | Glendale, SC | 16.5 mi |
| 29364 | Lockhart, SC | 16.5 mi |
Questions about 29321
What is the ZIP+4 code for 29321?
29321 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 29321, you need to look up a specific street address to get them.
What city is 29321?
29321 is assigned to Buffalo, South Carolina, in Union 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.