ZIP Code 31561 — Sea Island, GA
31561 is a standard (street delivery) ZIP code serving Sea Island, Georgia, in Glynn 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 31561 at a glance
| ZIP code | 31561 |
|---|---|
| Primary city | Sea Island |
| State | Georgia (GA) |
| County | Glynn FIPS 13127 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 96 |
| Coordinates | 31.201990, -81.337300 |
How ZIP+4 works in 31561
The four digits after the hyphen encode a delivery segment inside 31561. 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 31561 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 31561.
| ZIP | City | Distance |
|---|---|---|
| 31522 | Saint Simons Island, GA | 2.6 mi |
| 31524 | Brunswick, GA | 8.5 mi |
| 31520 | Brunswick, GA | 9 mi |
| 31527 | Jekyll Island, GA | 10.3 mi |
| 31525 | Brunswick, GA | 13.3 mi |
| 31305 | Darien, GA | 13.4 mi |
| 31523 | Brunswick, GA | 16.4 mi |
| 31327 | Sapelo Island, GA | 17.8 mi |
| 31565 | Waverly, GA | 20.5 mi |
| 31331 | Townsend, GA | 22.2 mi |
| 31566 | Waynesville, GA | 27.8 mi |
| 31569 | Woodbine, GA | 29.1 mi |
Questions about 31561
What is the ZIP+4 code for 31561?
31561 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 31561, you need to look up a specific street address to get them.
What city is 31561?
31561 is assigned to Sea Island, Georgia, in Glynn 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.