ZIP Code 59243 — Lambert, MT
59243 is a standard (street delivery) ZIP code serving Lambert, Montana, in Richland 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 59243 at a glance
| ZIP code | 59243 |
|---|---|
| Primary city | Lambert |
| State | Montana (MT) |
| County | Richland FIPS 30083 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 446 |
| Coordinates | 47.760620, -104.673870 |
How ZIP+4 works in 59243
The four digits after the hyphen encode a delivery segment inside 59243. 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 59243 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 59243.
| ZIP | City | Distance |
|---|---|---|
| 59259 | Richey, MT | 19.6 mi |
| 59262 | Savage, MT | 20 mi |
| 59217 | Crane, MT | 23.3 mi |
| 59315 | Bloomfield, MT | 23.9 mi |
| 59218 | Culbertson, MT | 24.4 mi |
| 59221 | Fairview, MT | 25.3 mi |
| 59213 | Brockton, MT | 29.9 mi |
| 59270 | Sidney, MT | 30.3 mi |
| 59212 | Bainville, MT | 37.9 mi |
| 59255 | Poplar, MT | 39.7 mi |
Questions about 59243
What is the ZIP+4 code for 59243?
59243 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 59243, you need to look up a specific street address to get them.
What city is 59243?
59243 is assigned to Lambert, Montana, in Richland 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.