ZIP Code 58521 — Baldwin, ND
58521 is a standard (street delivery) ZIP code serving Baldwin, North Dakota, in Burleigh 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 58521 at a glance
| ZIP code | 58521 |
|---|---|
| Primary city | Baldwin |
| State | North Dakota (ND) |
| County | Burleigh FIPS 38015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 722 |
| Coordinates | 47.026900, -100.669630 |
How ZIP+4 works in 58521
The four digits after the hyphen encode a delivery segment inside 58521. 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 58521 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 58521.
| ZIP | City | Distance |
|---|---|---|
| 58503 | Bismarck, ND | 9.2 mi |
| 58579 | Wilton, ND | 11.2 mi |
| 58501 | Bismarck, ND | 14.4 mi |
| 58477 | Regan, ND | 15.1 mi |
| 58505 | Bismarck, ND | 15.2 mi |
| 58558 | Menoken, ND | 15.8 mi |
| 58572 | Sterling, ND | 19 mi |
| 58504 | Bismarck, ND | 20.7 mi |
| 58494 | Wing, ND | 20.8 mi |
| 58554 | Mandan, ND | 23.1 mi |
| 58530 | Center, ND | 23.9 mi |
| 58577 | Washburn, ND | 27.1 mi |
Questions about 58521
What is the ZIP+4 code for 58521?
58521 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 58521, you need to look up a specific street address to get them.
What city is 58521?
58521 is assigned to Baldwin, North Dakota, in Burleigh 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.