ZIP Code 59820 — Alberton, MT
59820 is a standard (street delivery) ZIP code serving Alberton, 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 59820 at a glance
| ZIP code | 59820 |
|---|---|
| Primary city | Alberton |
| State | Montana (MT) |
| County | Mineral FIPS 30061 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 1,834 |
| Coordinates | 46.898030, -114.614740 |
How ZIP+4 works in 59820
The four digits after the hyphen encode a delivery segment inside 59820. 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 59820 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 59820.
| ZIP | City | Distance |
|---|---|---|
| 59847 | Lolo, MT | 16 mi |
| 59804 | Missoula, MT | 17.2 mi |
| 59846 | Huson, MT | 18.1 mi |
| 59872 | Superior, MT | 19.6 mi |
| 59834 | Frenchtown, MT | 22 mi |
| 59808 | Missoula, MT | 26.6 mi |
| 59831 | Dixon, MT | 28.7 mi |
| 59833 | Florence, MT | 30.8 mi |
| 59856 | Paradise, MT | 33.9 mi |
| 59863 | Ravalli, MT | 34.3 mi |
| 59870 | Stevensville, MT | 37.1 mi |
| 59875 | Victor, MT | 37.7 mi |
Questions about 59820
What is the ZIP+4 code for 59820?
59820 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 59820, you need to look up a specific street address to get them.
What city is 59820?
59820 is assigned to Alberton, 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.