ZIP Code 59420 — Carter, MT
59420 is a standard (street delivery) ZIP code serving Carter, Montana, in Chouteau 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 59420 at a glance
| ZIP code | 59420 |
|---|---|
| Primary city | Carter |
| State | Montana (MT) |
| County | Chouteau FIPS 30015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 164 |
| Coordinates | 47.896880, -111.040340 |
How ZIP+4 works in 59420
The four digits after the hyphen encode a delivery segment inside 59420. 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 59420 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 59420.
| ZIP | City | Distance |
|---|---|---|
| 59440 | Floweree, MT | 12.8 mi |
| 59442 | Fort Benton, MT | 18.3 mi |
| 59404 | Great Falls, MT | 23.2 mi |
| 59416 | Brady, MT | 24.5 mi |
| 59450 | Highwood, MT | 24.8 mi |
| 59460 | Loma, MT | 27.5 mi |
| 59414 | Black Eagle, MT | 27.6 mi |
| 59401 | Great Falls, MT | 28.8 mi |
| 59456 | Ledger, MT | 29.7 mi |
| 59468 | Power, MT | 30 mi |
| 59485 | Ulm, MT | 40.2 mi |
Questions about 59420
What is the ZIP+4 code for 59420?
59420 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 59420, you need to look up a specific street address to get them.
What city is 59420?
59420 is assigned to Carter, Montana, in Chouteau 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.