ZIP Code 57439 — Ferney, SD
57439 is a standard (street delivery) ZIP code serving Ferney, South Dakota, in Brown 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 57439 at a glance
| ZIP code | 57439 |
|---|---|
| Primary city | Ferney |
| State | South Dakota (SD) |
| County | Brown FIPS 46013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Coordinates | 45.334640, -98.100070 |
How ZIP+4 works in 57439
The four digits after the hyphen encode a delivery segment inside 57439. 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 57439 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 57439.
| ZIP | City | Distance |
|---|---|---|
| 57445 | Groton, SD | 8.6 mi |
| 57474 | Stratford, SD | 9.1 mi |
| 57422 | Andover, SD | 10.6 mi |
| 57434 | Conde, SD | 11.7 mi |
| 57427 | Bath, SD | 14.6 mi |
| 57219 | Bristol, SD | 14.9 mi |
| 57429 | Brentford, SD | 15.4 mi |
| 57479 | Warner, SD | 16.5 mi |
| 57461 | Mellette, SD | 20.1 mi |
| 57468 | Pierpont, SD | 20.3 mi |
| 57477 | Turton, SD | 20.9 mi |
| 57401 | Aberdeen, SD | 23 mi |
Questions about 57439
What is the ZIP+4 code for 57439?
57439 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 57439, you need to look up a specific street address to get them.
What city is 57439?
57439 is assigned to Ferney, South Dakota, in Brown 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.