ZIP Code 29403 — Charleston, SC
29403 is a standard (street delivery) ZIP code serving Charleston, South Carolina, in Charleston 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 29403 at a glance
| ZIP code | 29403 |
|---|---|
| Primary city | Charleston |
| State | South Carolina (SC) |
| County | Charleston FIPS 45019 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 22,533 |
| Coordinates | 32.803470, -79.945610 |
How ZIP+4 works in 29403
The four digits after the hyphen encode a delivery segment inside 29403. 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 29403 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 Charleston
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 29403.
| ZIP | City | Distance |
|---|---|---|
| 29409 | Charleston, SC | 1 mi |
| 29425 | Charleston, SC | 1.3 mi |
| 29424 | Charleston, SC | 1.4 mi |
| 29401 | Charleston, SC | 1.8 mi |
| 29407 | Charleston, SC | 3.1 mi |
| 29405 | North Charleston, SC | 3.9 mi |
| 29464 | Mount Pleasant, SC | 5.3 mi |
| 29412 | Charleston, SC | 6.5 mi |
| 29482 | Sullivans Island, SC | 6.8 mi |
| 29492 | Charleston, SC | 8.7 mi |
| 29404 | Charleston Afb, SC | 9 mi |
| 29418 | North Charleston, SC | 9.1 mi |
Questions about 29403
What is the ZIP+4 code for 29403?
29403 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 29403, you need to look up a specific street address to get them.
What city is 29403?
29403 is assigned to Charleston, South Carolina, in Charleston 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.