ZIP Code 57401 — Aberdeen, SD
57401 is a standard (street delivery) ZIP code serving Aberdeen, 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 57401 at a glance
| ZIP code | 57401 |
|---|---|
| Primary city | Aberdeen |
| State | South Dakota (SD) |
| County | Brown FIPS 46013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 31,939 |
| Coordinates | 45.475300, -98.530420 |
How ZIP+4 works in 57401
The four digits after the hyphen encode a delivery segment inside 57401. 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 57401 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 57401.
| ZIP | City | Distance |
|---|---|---|
| 57427 | Bath, SD | 10.3 mi |
| 57479 | Warner, SD | 12.6 mi |
| 57481 | Westport, SD | 13.9 mi |
| 57433 | Columbia, SD | 15.4 mi |
| 57460 | Mansfield, SD | 15.4 mi |
| 57426 | Barnard, SD | 18 mi |
| 57474 | Stratford, SD | 18 mi |
| 57451 | Ipswich, SD | 19.8 mi |
| 57445 | Groton, SD | 19.8 mi |
| 57461 | Mellette, SD | 22.2 mi |
| 57439 | Ferney, SD | 23 mi |
| 57465 | Northville, SD | 24 mi |
Questions about 57401
What is the ZIP+4 code for 57401?
57401 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 57401, you need to look up a specific street address to get them.
What city is 57401?
57401 is assigned to Aberdeen, 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.