ZIP Code 59866 — Saint Regis, MT
59866 is a standard (street delivery) ZIP code serving Saint Regis, Montana, in Mineral 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 59866 at a glance
| ZIP code | 59866 |
|---|---|
| Primary city | Saint Regis |
| State | Montana (MT) |
| County | Mineral FIPS 30061 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 1,161 |
| Coordinates | 47.322070, -115.123290 |
How ZIP+4 works in 59866
The four digits after the hyphen encode a delivery segment inside 59866. 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 59866 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 59866.
| ZIP | City | Distance |
|---|---|---|
| 59842 | Haugan, MT | 13 mi |
| 59830 | De Borgia, MT | 17.5 mi |
| 59872 | Superior, MT | 18.3 mi |
| 59856 | Paradise, MT | 18.6 mi |
| 59859 | Plains, MT | 20.3 mi |
| 59867 | Saltese, MT | 20.7 mi |
| 59873 | Thompson Falls, MT | 26.8 mi |
| 59848 | Lonepine, MT | 34.1 mi |
| 59845 | Hot Springs, MT | 35.6 mi |
| 59820 | Alberton, MT | 37.7 mi |
| 59874 | Trout Creek, MT | 40.4 mi |
Questions about 59866
What is the ZIP+4 code for 59866?
59866 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 59866, you need to look up a specific street address to get them.
What city is 59866?
59866 is assigned to Saint Regis, Montana, in Mineral 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.