ZIP Code 57038 — Jefferson, SD
57038 is a standard (street delivery) ZIP code serving Jefferson, 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 57038 at a glance
| ZIP code | 57038 |
|---|---|
| Primary city | Jefferson |
| State | South Dakota (SD) |
| County | Union FIPS 46127 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,796 |
| Coordinates | 42.579240, -96.579570 |
How ZIP+4 works in 57038
The four digits after the hyphen encode a delivery segment inside 57038. 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 57038 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 57038.
| ZIP | City | Distance |
|---|---|---|
| 57049 | North Sioux City, SD | 5.2 mi |
| 51109 | Sioux City, IA | 5.3 mi |
| 68743 | Jackson, NE | 7.7 mi |
| 51103 | Sioux City, IA | 7.8 mi |
| 51062 | Westfield, IA | 9 mi |
| 51104 | Sioux City, IA | 9.4 mi |
| 68770 | Ponca, NE | 9.7 mi |
| 68776 | South Sioux City, NE | 10.7 mi |
| 57025 | Elk Point, SD | 11 mi |
| 51101 | Sioux City, IA | 11.1 mi |
| 51108 | Sioux City, IA | 11.8 mi |
| 51105 | Sioux City, IA | 11.9 mi |
Questions about 57038
What is the ZIP+4 code for 57038?
57038 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 57038, you need to look up a specific street address to get them.
What city is 57038?
57038 is assigned to Jefferson, 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.