ZIP Code 57783 — Spearfish, SD
57783 is a standard (street delivery) ZIP code serving Spearfish, South Dakota, in Lawrence 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 57783 at a glance
| ZIP code | 57783 |
|---|---|
| Primary city | Spearfish |
| State | South Dakota (SD) |
| County | Lawrence FIPS 46081 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 17,248 |
| Coordinates | 44.471060, -103.921900 |
How ZIP+4 works in 57783
The four digits after the hyphen encode a delivery segment inside 57783. 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 57783 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.
Other ZIP codes in Spearfish
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 57783.
| ZIP | City | Distance |
|---|---|---|
| 57799 | Spearfish, SD | 3.1 mi |
| 57779 | Saint Onge, SD | 10.3 mi |
| 82712 | Beulah, WY | 10.6 mi |
| 57754 | Lead, SD | 14.6 mi |
| 57793 | Whitewood, SD | 17.1 mi |
| 57732 | Deadwood, SD | 21.1 mi |
| 57741 | Fort Meade, SD | 22.5 mi |
| 82729 | Sundance, WY | 24.1 mi |
| 82710 | Aladdin, WY | 24.5 mi |
| 57762 | Nisland, SD | 24.8 mi |
| 57759 | Nemo, SD | 25.1 mi |
| 82711 | Alva, WY | 32.1 mi |
Questions about 57783
What is the ZIP+4 code for 57783?
57783 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 57783, you need to look up a specific street address to get them.
What city is 57783?
57783 is assigned to Spearfish, South Dakota, in Lawrence 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.