ZIP Code 59323 — Colstrip, MT
59323 is a standard (street delivery) ZIP code serving Colstrip, Montana, in Rosebud 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 59323 at a glance
| ZIP code | 59323 |
|---|---|
| Primary city | Colstrip |
| State | Montana (MT) |
| County | Rosebud FIPS 30087 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 2,101 |
| Coordinates | 45.912340, -106.703200 |
How ZIP+4 works in 59323
The four digits after the hyphen encode a delivery segment inside 59323. 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 59323 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 59323.
| ZIP | City | Distance |
|---|---|---|
| 59327 | Forsyth, MT | 22.5 mi |
| 59043 | Lame Deer, MT | 26.3 mi |
| 59076 | Sanders, MT | 31 mi |
| 59038 | Hysham, MT | 31.7 mi |
| 59333 | Hathaway, MT | 33.6 mi |
| 59022 | Crow Agency, MT | 35.7 mi |
| 59016 | Busby, MT | 35.9 mi |
| 59003 | Ashland, MT | 38.2 mi |
Questions about 59323
What is the ZIP+4 code for 59323?
59323 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 59323, you need to look up a specific street address to get them.
What city is 59323?
59323 is assigned to Colstrip, Montana, in Rosebud 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.