ZIP Code 59421 — Cascade, MT
59421 is a standard (street delivery) ZIP code serving Cascade, Montana, in Cascade 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 59421 at a glance
| ZIP code | 59421 |
|---|---|
| Primary city | Cascade |
| State | Montana (MT) |
| County | Cascade FIPS 30013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 2,069 |
| Coordinates | 47.201790, -111.720000 |
How ZIP+4 works in 59421
The four digits after the hyphen encode a delivery segment inside 59421. 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 59421 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 59421.
| ZIP | City | Distance |
|---|---|---|
| 59485 | Ulm, MT | 17.5 mi |
| 59483 | Sun River, MT | 18.7 mi |
| 59477 | Simms, MT | 20.6 mi |
| 59648 | Wolf Creek, MT | 21.6 mi |
| 59405 | Great Falls, MT | 22.3 mi |
| 59443 | Fort Shaw, MT | 25.4 mi |
| 59487 | Vaughn, MT | 26.6 mi |
| 59480 | Stockett, MT | 28.2 mi |
| 59472 | Sand Coulee, MT | 28.5 mi |
| 59401 | Great Falls, MT | 29.8 mi |
| 59414 | Black Eagle, MT | 30.9 mi |
| 59602 | Helena, MT | 33.3 mi |
Questions about 59421
What is the ZIP+4 code for 59421?
59421 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 59421, you need to look up a specific street address to get them.
What city is 59421?
59421 is assigned to Cascade, Montana, in Cascade 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.