ZIP Code 57345 — Highmore, SD
57345 is a standard (street delivery) ZIP code serving Highmore, South Dakota, in Hyde 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 57345 at a glance
| ZIP code | 57345 |
|---|---|
| Primary city | Highmore |
| State | South Dakota (SD) |
| County | Hyde FIPS 46069 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 941 |
| Coordinates | 44.568700, -99.450090 |
How ZIP+4 works in 57345
The four digits after the hyphen encode a delivery segment inside 57345. 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 57345 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 57345.
| ZIP | City | Distance |
|---|---|---|
| 57540 | Holabird, SD | 10.4 mi |
| 57371 | Ree Heights, SD | 14.3 mi |
| 57536 | Harrold, SD | 18.8 mi |
| 57362 | Miller, SD | 20 mi |
| 57346 | Stephan, SD | 22.1 mi |
| 57467 | Orient, SD | 23.4 mi |
| 57522 | Blunt, SD | 25.6 mi |
| 57373 | Saint Lawrence, SD | 28.7 mi |
| 57473 | Seneca, SD | 29.1 mi |
| 57564 | Onida, SD | 29.6 mi |
| 57339 | Fort Thompson, SD | 31.5 mi |
| 57455 | Lebanon, SD | 32.6 mi |
Questions about 57345
What is the ZIP+4 code for 57345?
57345 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 57345, you need to look up a specific street address to get them.
What city is 57345?
57345 is assigned to Highmore, South Dakota, in Hyde 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.