ZIP Code 59230 — Glasgow, MT
59230 is a standard (street delivery) ZIP code serving Glasgow, Montana, in Valley 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 59230 at a glance
| ZIP code | 59230 |
|---|---|
| Primary city | Glasgow |
| State | Montana (MT) |
| County | Valley FIPS 30105 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 4,606 |
| Coordinates | 48.099920, -106.801960 |
How ZIP+4 works in 59230
The four digits after the hyphen encode a delivery segment inside 59230. 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 59230 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 59230.
| ZIP | City | Distance |
|---|---|---|
| 59273 | Vandalia, MT | 14.8 mi |
| 59231 | Saint Marie, MT | 24.1 mi |
| 59241 | Hinsdale, MT | 27.4 mi |
| 59248 | Nashua, MT | 27.8 mi |
| 59261 | Saco, MT | 39.4 mi |
Questions about 59230
What is the ZIP+4 code for 59230?
59230 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 59230, you need to look up a specific street address to get them.
What city is 59230?
59230 is assigned to Glasgow, Montana, in Valley 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.