ZIP Code 57312 — Alpena, SD
57312 is a standard (street delivery) ZIP code serving Alpena, South Dakota, in Beadle 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 57312 at a glance
| ZIP code | 57312 |
|---|---|
| Primary city | Alpena |
| State | South Dakota (SD) |
| County | Beadle FIPS 46005 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 596 |
| Coordinates | 44.196460, -98.385640 |
How ZIP+4 works in 57312
The four digits after the hyphen encode a delivery segment inside 57312. 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 57312 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 57312.
| ZIP | City | Distance |
|---|---|---|
| 57358 | Lane, SD | 8.6 mi |
| 57379 | Virgil, SD | 8.9 mi |
| 57385 | Woonsocket, SD | 11.4 mi |
| 57384 | Wolsey, SD | 16.2 mi |
| 57350 | Huron, SD | 16.5 mi |
| 57382 | Wessington Springs, SD | 17.2 mi |
| 57324 | Cavour, SD | 18.3 mi |
| 57381 | Wessington, SD | 21.6 mi |
| 57314 | Artesian, SD | 22 mi |
| 57359 | Letcher, SD | 23.3 mi |
| 57386 | Yale, SD | 28.8 mi |
| 57348 | Hitchcock, SD | 29.3 mi |
Questions about 57312
What is the ZIP+4 code for 57312?
57312 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 57312, you need to look up a specific street address to get them.
What city is 57312?
57312 is assigned to Alpena, South Dakota, in Beadle 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.