ZIP Code 42339 — Dunmor, KY
42339 is a standard (street delivery) ZIP code serving Dunmor, Kentucky, in Muhlenberg 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 42339 at a glance
| ZIP code | 42339 |
|---|---|
| Primary city | Dunmor |
| State | Kentucky (KY) |
| County | Muhlenberg FIPS 21177 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 840 |
| Coordinates | 37.113260, -86.950330 |
How ZIP+4 works in 42339
The four digits after the hyphen encode a delivery segment inside 42339. 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 42339 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 42339.
| ZIP | City | Distance |
|---|---|---|
| 42324 | Belton, KY | 3.7 mi |
| 42323 | Beechmont, KY | 6.2 mi |
| 42256 | Lewisburg, KY | 6.7 mi |
| 42321 | Beech Creek, KY | 7.2 mi |
| 42273 | Rochester, KY | 7.9 mi |
| 42337 | Drakesboro, KY | 8 mi |
| 42326 | Browder, KY | 9.1 mi |
| 42332 | Cleaton, KY | 12.2 mi |
| 42345 | Greenville, KY | 13.4 mi |
| 42280 | Sharon Grove, KY | 13.9 mi |
| 42367 | Powderly, KY | 14.7 mi |
| 42369 | Rockport, KY | 16.7 mi |
Questions about 42339
What is the ZIP+4 code for 42339?
42339 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 42339, you need to look up a specific street address to get them.
What city is 42339?
42339 is assigned to Dunmor, Kentucky, in Muhlenberg 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.