ZIP Code 57779 — Saint Onge, SD
57779 is a standard (street delivery) ZIP code serving Saint Onge, South Dakota, in Lawrence 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 57779 at a glance
| ZIP code | 57779 |
|---|---|
| Primary city | Saint Onge |
| State | South Dakota (SD) |
| County | Lawrence FIPS 46081 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 347 |
| Coordinates | 44.564490, -103.759690 |
How ZIP+4 works in 57779
The four digits after the hyphen encode a delivery segment inside 57779. 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 57779 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 57779.
| ZIP | City | Distance |
|---|---|---|
| 57799 | Spearfish, SD | 7.2 mi |
| 57793 | Whitewood, SD | 9.3 mi |
| 57783 | Spearfish, SD | 10.3 mi |
| 57762 | Nisland, SD | 15 mi |
| 57741 | Fort Meade, SD | 17.7 mi |
| 82712 | Beulah, WY | 18.1 mi |
| 57754 | Lead, SD | 21.6 mi |
| 57732 | Deadwood, SD | 23.3 mi |
| 57759 | Nemo, SD | 25.8 mi |
| 57788 | Vale, SD | 27 mi |
| 82710 | Aladdin, WY | 27.8 mi |
| 57785 | Sturgis, SD | 28.6 mi |
Questions about 57779
What is the ZIP+4 code for 57779?
57779 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 57779, you need to look up a specific street address to get them.
What city is 57779?
57779 is assigned to Saint Onge, South Dakota, in Lawrence 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.