ZIP Code 58631 — Glen Ullin, ND
58631 is a standard (street delivery) ZIP code serving Glen Ullin, North Dakota, in Morton 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 58631 at a glance
| ZIP code | 58631 |
|---|---|
| Primary city | Glen Ullin |
| State | North Dakota (ND) |
| County | Morton FIPS 38059 |
| ZIP type | Standard (street delivery) |
| Time zone | America/North_Dakota/New_Salem |
| Population | 953 |
| Coordinates | 46.796900, -101.821560 |
How ZIP+4 works in 58631
The four digits after the hyphen encode a delivery segment inside 58631. 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 58631 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 58631.
| ZIP | City | Distance |
|---|---|---|
| 58638 | Hebron, ND | 13.8 mi |
| 58520 | Almont, ND | 15.7 mi |
| 58563 | New Salem, ND | 19.7 mi |
| 58652 | Richardton, ND | 22.1 mi |
| 58533 | Elgin, ND | 27.8 mi |
| 58562 | New Leipzig, ND | 31.2 mi |
| 58523 | Beulah, ND | 32.4 mi |
| 58580 | Zap, ND | 32.8 mi |
| 58535 | Flasher, ND | 34.6 mi |
| 58644 | Marshall, ND | 34.7 mi |
| 58646 | Mott, ND | 35.2 mi |
| 58529 | Carson, ND | 36.2 mi |
Questions about 58631
What is the ZIP+4 code for 58631?
58631 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 58631, you need to look up a specific street address to get them.
What city is 58631?
58631 is assigned to Glen Ullin, North Dakota, in Morton 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.