ZIP Code 57330 — Delmont, SD
57330 is a standard (street delivery) ZIP code serving Delmont, South Dakota, in Douglas 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 57330 at a glance
| ZIP code | 57330 |
|---|---|
| Primary city | Delmont |
| State | South Dakota (SD) |
| County | Douglas FIPS 46043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 594 |
| Coordinates | 43.261470, -98.160820 |
How ZIP+4 works in 57330
The four digits after the hyphen encode a delivery segment inside 57330. 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 57330 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 57330.
| ZIP | City | Distance |
|---|---|---|
| 57313 | Armour, SD | 10.7 mi |
| 57376 | Tripp, SD | 11.4 mi |
| 57366 | Parkston, SD | 13.9 mi |
| 57331 | Dimock, SD | 15.7 mi |
| 57354 | Kaylor, SD | 16.7 mi |
| 57380 | Wagner, SD | 17 mi |
| 57328 | Corsica, SD | 18.5 mi |
| 57315 | Avon, SD | 19.3 mi |
| 57356 | Lake Andes, SD | 19.6 mi |
| 57329 | Dante, SD | 19.6 mi |
| 57334 | Ethan, SD | 21.1 mi |
| 57059 | Scotland, SD | 22.1 mi |
Questions about 57330
What is the ZIP+4 code for 57330?
57330 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 57330, you need to look up a specific street address to get them.
What city is 57330?
57330 is assigned to Delmont, South Dakota, in Douglas 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.