ZIP Code 59859 — Plains, MT
59859 is a standard (street delivery) ZIP code serving Plains, Montana, in Sanders 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 59859 at a glance
| ZIP code | 59859 |
|---|---|
| Primary city | Plains |
| State | Montana (MT) |
| County | Sanders FIPS 30089 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 4,360 |
| Coordinates | 47.520500, -114.803960 |
How ZIP+4 works in 59859
The four digits after the hyphen encode a delivery segment inside 59859. 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 59859 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 59859.
| ZIP | City | Distance |
|---|---|---|
| 59856 | Paradise, MT | 10 mi |
| 59848 | Lonepine, MT | 14.6 mi |
| 59845 | Hot Springs, MT | 15.3 mi |
| 59866 | Saint Regis, MT | 20.2 mi |
| 59873 | Thompson Falls, MT | 25.1 mi |
| 59831 | Dixon, MT | 26.5 mi |
| 59915 | Elmo, MT | 27.6 mi |
| 59846 | Huson, MT | 29.1 mi |
| 59872 | Superior, MT | 29.2 mi |
| 59842 | Haugan, MT | 30.9 mi |
| 59929 | Proctor, MT | 33.5 mi |
| 59914 | Dayton, MT | 33.7 mi |
Questions about 59859
What is the ZIP+4 code for 59859?
59859 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 59859, you need to look up a specific street address to get them.
What city is 59859?
59859 is assigned to Plains, Montana, in Sanders 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.