ZIP Code 56257 — Marietta, MN
56257 is a standard (street delivery) ZIP code serving Marietta, Minnesota, in Lac qui Parle 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 56257 at a glance
| ZIP code | 56257 |
|---|---|
| Primary city | Marietta |
| State | Minnesota (MN) |
| County | Lac qui Parle FIPS 27073 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 377 |
| Coordinates | 44.968400, -96.402750 |
How ZIP+4 works in 56257
The four digits after the hyphen encode a delivery segment inside 56257. 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 56257 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 56257.
| ZIP | City | Distance |
|---|---|---|
| 57259 | Revillo, SD | 8.4 mi |
| 56256 | Madison, MN | 10.6 mi |
| 56212 | Bellingham, MN | 12.1 mi |
| 57237 | Gary, SD | 13.4 mi |
| 57246 | Labolt, SD | 14.4 mi |
| 56220 | Canby, MN | 17.2 mi |
| 56232 | Dawson, MN | 17.9 mi |
| 57252 | Milbank, SD | 19.2 mi |
| 57265 | Strandburg, SD | 19.2 mi |
| 56276 | Odessa, MN | 19.3 mi |
| 57226 | Clear Lake, SD | 20.1 mi |
| 57264 | Stockholm, SD | 21.8 mi |
Questions about 56257
What is the ZIP+4 code for 56257?
56257 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 56257, you need to look up a specific street address to get them.
What city is 56257?
56257 is assigned to Marietta, Minnesota, in Lac qui Parle 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.