ZIP Code 57473 — Seneca, SD
57473 is a standard (street delivery) ZIP code serving Seneca, South Dakota, in Faulk 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 57473 at a glance
| ZIP code | 57473 |
|---|---|
| Primary city | Seneca |
| State | South Dakota (SD) |
| County | Faulk FIPS 46049 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 246 |
| Coordinates | 44.989930, -99.483000 |
How ZIP+4 works in 57473
The four digits after the hyphen encode a delivery segment inside 57473. 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 57473 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 57473.
| ZIP | City | Distance |
|---|---|---|
| 57455 | Lebanon, SD | 12.5 mi |
| 57466 | Onaka, SD | 14.6 mi |
| 57438 | Faulkton, SD | 16.9 mi |
| 57475 | Tolstoy, SD | 17.8 mi |
| 57467 | Orient, SD | 20.1 mi |
| 57450 | Hoven, SD | 23.3 mi |
| 57345 | Highmore, SD | 29.1 mi |
| 57471 | Roscoe, SD | 30.1 mi |
| 57435 | Cresbard, SD | 30.6 mi |
| 57564 | Onida, SD | 31.7 mi |
| 57428 | Bowdle, SD | 33.1 mi |
| 57522 | Blunt, SD | 40.6 mi |
Questions about 57473
What is the ZIP+4 code for 57473?
57473 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 57473, you need to look up a specific street address to get them.
What city is 57473?
57473 is assigned to Seneca, South Dakota, in Faulk 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.