ZIP Code 29451 — Isle Of Palms, SC
29451 is a standard (street delivery) ZIP code serving Isle Of Palms, 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 29451 at a glance
| ZIP code | 29451 |
|---|---|
| Primary city | Isle Of Palms |
| State | South Carolina (SC) |
| County | Charleston FIPS 45019 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 4,362 |
| Coordinates | 32.816330, -79.752660 |
How ZIP+4 works in 29451
The four digits after the hyphen encode a delivery segment inside 29451. 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 29451 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 29451.
| ZIP | City | Distance |
|---|---|---|
| 29466 | Mount Pleasant, SC | 4.5 mi |
| 29482 | Sullivans Island, SC | 5.8 mi |
| 29464 | Mount Pleasant, SC | 6 mi |
| 29492 | Charleston, SC | 10 mi |
| 29401 | Charleston, SC | 10.9 mi |
| 29424 | Charleston, SC | 11 mi |
| 29403 | Charleston, SC | 11.2 mi |
| 29425 | Charleston, SC | 11.5 mi |
| 29409 | Charleston, SC | 12.1 mi |
| 29429 | Awendaw, SC | 12.5 mi |
| 29405 | North Charleston, SC | 13.4 mi |
| 29412 | Charleston, SC | 13.7 mi |
Questions about 29451
What is the ZIP+4 code for 29451?
29451 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 29451, you need to look up a specific street address to get them.
What city is 29451?
29451 is assigned to Isle Of Palms, 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.