ZIP Code 57261 — Roslyn, SD
57261 is a standard (street delivery) ZIP code serving Roslyn, South Dakota, in Day 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 57261 at a glance
| ZIP code | 57261 |
|---|---|
| Primary city | Roslyn |
| State | South Dakota (SD) |
| County | Day FIPS 46037 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 277 |
| Coordinates | 45.540510, -97.494120 |
How ZIP+4 works in 57261
The four digits after the hyphen encode a delivery segment inside 57261. 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 57261 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 57261.
| ZIP | City | Distance |
|---|---|---|
| 57232 | Eden, SD | 7.5 mi |
| 57239 | Grenville, SD | 9.1 mi |
| 57247 | Lake City, SD | 12.3 mi |
| 57468 | Pierpont, SD | 12.9 mi |
| 57454 | Langford, SD | 14.3 mi |
| 57274 | Webster, SD | 16.2 mi |
| 57273 | Waubay, SD | 17.8 mi |
| 57422 | Andover, SD | 22.2 mi |
| 57430 | Britton, SD | 22.3 mi |
| 57257 | Peever, SD | 22.6 mi |
| 57262 | Sisseton, SD | 22.6 mi |
| 57270 | Veblen, SD | 22.7 mi |
Questions about 57261
What is the ZIP+4 code for 57261?
57261 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 57261, you need to look up a specific street address to get them.
What city is 57261?
57261 is assigned to Roslyn, South Dakota, in Day 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.