ZIP Code 57782 — Smithwick, SD
57782 is a standard (street delivery) ZIP code serving Smithwick, South Dakota, in Fall River 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 57782 at a glance
| ZIP code | 57782 |
|---|---|
| Primary city | Smithwick |
| State | South Dakota (SD) |
| County | Fall River FIPS 46047 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 58 |
| Coordinates | 43.251820, -103.184400 |
How ZIP+4 works in 57782
The four digits after the hyphen encode a delivery segment inside 57782. 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 57782 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 57782.
| ZIP | City | Distance |
|---|---|---|
| 57766 | Oral, SD | 7.3 mi |
| 57763 | Oelrichs, SD | 9.7 mi |
| 57722 | Buffalo Gap, SD | 17.5 mi |
| 57747 | Hot Springs, SD | 19.2 mi |
| 57764 | Oglala, SD | 21.6 mi |
| 69337 | Chadron, NE | 28.3 mi |
| 57738 | Fairburn, SD | 28.5 mi |
| 57770 | Pine Ridge, SD | 30.6 mi |
| 69367 | Whitney, NE | 30.8 mi |
| 57773 | Pringle, SD | 31.3 mi |
| 57730 | Custer, SD | 39.8 mi |
Questions about 57782
What is the ZIP+4 code for 57782?
57782 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 57782, you need to look up a specific street address to get them.
What city is 57782?
57782 is assigned to Smithwick, South Dakota, in Fall River 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.