ZIP Code 57078 — Yankton, SD
57078 is a standard (street delivery) ZIP code serving Yankton, South Dakota, in Yankton 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 57078 at a glance
| ZIP code | 57078 |
|---|---|
| Primary city | Yankton |
| State | South Dakota (SD) |
| County | Yankton FIPS 46135 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 20,383 |
| Coordinates | 42.917820, -97.447020 |
How ZIP+4 works in 57078
The four digits after the hyphen encode a delivery segment inside 57078. 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 57078 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 57078.
| ZIP | City | Distance |
|---|---|---|
| 57046 | Mission Hill, SD | 7.8 mi |
| 57067 | Utica, SD | 8.6 mi |
| 68774 | Saint Helena, NE | 11.2 mi |
| 68730 | Crofton, NE | 11.3 mi |
| 57063 | Tabor, SD | 12.1 mi |
| 57040 | Lesterville, SD | 12.2 mi |
| 68736 | Fordyce, NE | 12.5 mi |
| 57072 | Volin, SD | 13.2 mi |
| 57031 | Gayville, SD | 13.6 mi |
| 57037 | Irene, SD | 16 mi |
| 57045 | Menno, SD | 19.9 mi |
| 57073 | Wakonda, SD | 20.5 mi |
Questions about 57078
What is the ZIP+4 code for 57078?
57078 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 57078, you need to look up a specific street address to get them.
What city is 57078?
57078 is assigned to Yankton, South Dakota, in Yankton 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.