ZIP Code 57001 — Alcester, SD
57001 is a standard (street delivery) ZIP code serving Alcester, South Dakota, in Union 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 57001 at a glance
| ZIP code | 57001 |
|---|---|
| Primary city | Alcester |
| State | South Dakota (SD) |
| County | Union FIPS 46127 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,540 |
| Coordinates | 42.998100, -96.654920 |
How ZIP+4 works in 57001
The four digits after the hyphen encode a delivery segment inside 57001. 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 57001 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 57001.
| ZIP | City | Distance |
|---|---|---|
| 57004 | Beresford, SD | 8.8 mi |
| 51011 | Chatsworth, IA | 9.1 mi |
| 51023 | Hawarden, IA | 9.4 mi |
| 57034 | Hudson, SD | 10.3 mi |
| 51001 | Akron, IA | 12.3 mi |
| 57027 | Fairview, SD | 15.4 mi |
| 57010 | Burbank, SD | 15.4 mi |
| 51027 | Ireton, IA | 16.7 mi |
| 57014 | Centerville, SD | 17 mi |
| 57025 | Elk Point, SD | 19.5 mi |
| 57069 | Vermillion, SD | 19.9 mi |
| 57013 | Canton, SD | 19.9 mi |
Questions about 57001
What is the ZIP+4 code for 57001?
57001 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 57001, you need to look up a specific street address to get them.
What city is 57001?
57001 is assigned to Alcester, South Dakota, in Union 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.