ZIP Code 57365 — Oacoma, SD
57365 is a standard (street delivery) ZIP code serving Oacoma, South Dakota, in Lyman 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 57365 at a glance
| ZIP code | 57365 |
|---|---|
| Primary city | Oacoma |
| State | South Dakota (SD) |
| County | Lyman FIPS 46085 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 599 |
| Coordinates | 43.811480, -99.417230 |
How ZIP+4 works in 57365
The four digits after the hyphen encode a delivery segment inside 57365. 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 57365 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 57365.
| ZIP | City | Distance |
|---|---|---|
| 57325 | Chamberlain, SD | 5.6 mi |
| 57569 | Reliance, SD | 8.6 mi |
| 57370 | Pukwana, SD | 12.2 mi |
| 57534 | Hamill, SD | 20.5 mi |
| 57339 | Fort Thompson, SD | 21 mi |
| 57548 | Lower Brule, SD | 21.4 mi |
| 57544 | Kennebec, SD | 21.5 mi |
| 57355 | Kimball, SD | 23.4 mi |
| 57341 | Gann Valley, SD | 24.7 mi |
| 57541 | Ideal, SD | 28.5 mi |
| 57346 | Stephan, SD | 30.2 mi |
| 57533 | Gregory, SD | 32.1 mi |
Questions about 57365
What is the ZIP+4 code for 57365?
57365 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 57365, you need to look up a specific street address to get them.
What city is 57365?
57365 is assigned to Oacoma, South Dakota, in Lyman 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.