ZIP Code 59851 — Milltown, MT
59851 is a standard (street delivery) ZIP code serving Milltown, Montana, in Missoula 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 59851 at a glance
| ZIP code | 59851 |
|---|---|
| Primary city | Milltown |
| State | Montana (MT) |
| County | Missoula FIPS 30063 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 145 |
| Coordinates | 46.872150, -113.873480 |
How ZIP+4 works in 59851
The four digits after the hyphen encode a delivery segment inside 59851. 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 59851 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 59851.
| ZIP | City | Distance |
|---|---|---|
| 59802 | Missoula, MT | 3.2 mi |
| 59812 | Missoula, MT | 5.3 mi |
| 59801 | Missoula, MT | 6.6 mi |
| 59803 | Missoula, MT | 7.6 mi |
| 59808 | Missoula, MT | 11.7 mi |
| 59823 | Bonner, MT | 14.5 mi |
| 59825 | Clinton, MT | 17.7 mi |
| 59804 | Missoula, MT | 17.9 mi |
| 59833 | Florence, MT | 18.4 mi |
| 59834 | Frenchtown, MT | 21.4 mi |
| 59821 | Arlee, MT | 21.9 mi |
| 59847 | Lolo, MT | 25.7 mi |
Questions about 59851
What is the ZIP+4 code for 59851?
59851 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 59851, you need to look up a specific street address to get them.
What city is 59851?
59851 is assigned to Milltown, Montana, in Missoula 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.