ZIP Code 42259 — Mammoth Cave, KY
42259 is a standard (street delivery) ZIP code serving Mammoth Cave, Kentucky, in Edmonson 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 42259 at a glance
| ZIP code | 42259 |
|---|---|
| Primary city | Mammoth Cave |
| State | Kentucky (KY) |
| County | Edmonson FIPS 21061 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,090 |
| Coordinates | 37.235240, -86.172060 |
How ZIP+4 works in 42259
The four digits after the hyphen encode a delivery segment inside 42259. 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 42259 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 42259.
| ZIP | City | Distance |
|---|---|---|
| 42729 | Cub Run, KY | 6.2 mi |
| 42285 | Sweeden, KY | 7.2 mi |
| 42207 | Bee Spring, KY | 7.5 mi |
| 42210 | Brownsville, KY | 7.9 mi |
| 42160 | Park City, KY | 10.4 mi |
| 42163 | Rocky Hill, KY | 10.9 mi |
| 42726 | Clarkson, KY | 13.1 mi |
| 42171 | Smiths Grove, KY | 13.7 mi |
| 42765 | Munfordville, KY | 14.1 mi |
| 42275 | Roundhill, KY | 15.1 mi |
| 42127 | Cave City, KY | 15.6 mi |
| 42749 | Horse Cave, KY | 16.6 mi |
Questions about 42259
What is the ZIP+4 code for 42259?
42259 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 42259, you need to look up a specific street address to get them.
What city is 42259?
42259 is assigned to Mammoth Cave, Kentucky, in Edmonson 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.