ZIP Code 59523 — Chinook, MT
59523 is a standard (street delivery) ZIP code serving Chinook, Montana, in Blaine 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 59523 at a glance
| ZIP code | 59523 |
|---|---|
| Primary city | Chinook |
| State | Montana (MT) |
| County | Blaine FIPS 30005 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 2,356 |
| Coordinates | 48.520130, -109.208290 |
How ZIP+4 works in 59523
The four digits after the hyphen encode a delivery segment inside 59523. 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 59523 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 59523.
| ZIP | City | Distance |
|---|---|---|
| 59547 | Zurich, MT | 16.3 mi |
| 59526 | Harlem, MT | 25.1 mi |
| 59501 | Havre, MT | 29 mi |
| 59529 | Hogeland, MT | 30.4 mi |
| 59527 | Hays, MT | 39 mi |
Questions about 59523
What is the ZIP+4 code for 59523?
59523 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 59523, you need to look up a specific street address to get them.
What city is 59523?
59523 is assigned to Chinook, Montana, in Blaine 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.