ZIP Code 59058 — Mosby, MT
59058 is a standard (street delivery) ZIP code serving Mosby, Montana, in Garfield 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 59058 at a glance
| ZIP code | 59058 |
|---|---|
| Primary city | Mosby |
| State | Montana (MT) |
| County | Garfield FIPS 30033 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 54 |
| Coordinates | 46.985170, -107.796520 |
How ZIP+4 works in 59058
The four digits after the hyphen encode a delivery segment inside 59058. 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 59058 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 59058.
| ZIP | City | Distance |
|---|---|---|
| 59077 | Sand Springs, MT | 19 mi |
| 59054 | Melstone, MT | 21.9 mi |
| 59087 | Winnett, MT | 23.9 mi |
| 59039 | Ingomar, MT | 31.8 mi |
| 59083 | Sumatra, MT | 31.9 mi |
| 59059 | Musselshell, MT | 35.4 mi |
Questions about 59058
What is the ZIP+4 code for 59058?
59058 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 59058, you need to look up a specific street address to get them.
What city is 59058?
59058 is assigned to Mosby, Montana, in Garfield 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.