ZIP Code 29678 — Seneca, SC
29678 is a standard (street delivery) ZIP code serving Seneca, South Carolina, in Oconee 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 29678 at a glance
| ZIP code | 29678 |
|---|---|
| Primary city | Seneca |
| State | South Carolina (SC) |
| County | Oconee FIPS 45073 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 23,767 |
| Coordinates | 34.633650, -82.939910 |
How ZIP+4 works in 29678
The four digits after the hyphen encode a delivery segment inside 29678. 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 29678 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.
Other ZIP codes in Seneca
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 29678.
| ZIP | City | Distance |
|---|---|---|
| 29665 | Newry, SC | 6.4 mi |
| 29634 | Clemson, SC | 6.4 mi |
| 29689 | Townville, SC | 7.6 mi |
| 29631 | Clemson, SC | 7.7 mi |
| 29672 | Seneca, SC | 8.1 mi |
| 29643 | Fair Play, SC | 9.1 mi |
| 29696 | West Union, SC | 10.5 mi |
| 29630 | Central, SC | 10.9 mi |
| 29625 | Anderson, SC | 11.4 mi |
| 29670 | Pendleton, SC | 12.2 mi |
| 29693 | Westminster, SC | 12.2 mi |
| 29691 | Walhalla, SC | 13 mi |
Questions about 29678
What is the ZIP+4 code for 29678?
29678 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 29678, you need to look up a specific street address to get them.
What city is 29678?
29678 is assigned to Seneca, South Carolina, in Oconee 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.