ZIP Code 42788 — White Mills, KY
42788 is a standard (street delivery) ZIP code serving White Mills, Kentucky, in Hardin 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 42788 at a glance
| ZIP code | 42788 |
|---|---|
| Primary city | White Mills |
| State | Kentucky (KY) |
| County | Hardin FIPS 21093 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 192 |
| Coordinates | 37.527740, -86.037200 |
How ZIP+4 works in 42788
The four digits after the hyphen encode a delivery segment inside 42788. 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 42788 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 42788.
| ZIP | City | Distance |
|---|---|---|
| 42776 | Sonora, KY | 6.6 mi |
| 42740 | Glendale, KY | 6.8 mi |
| 42732 | Eastview, KY | 7 mi |
| 42712 | Big Clifty, KY | 7 mi |
| 42784 | Upton, KY | 8.2 mi |
| 42726 | Clarkson, KY | 9.5 mi |
| 42724 | Cecilia, KY | 10.1 mi |
| 42713 | Bonnieville, KY | 13.4 mi |
| 42754 | Leitchfield, KY | 15.5 mi |
| 40162 | Rineyville, KY | 15.5 mi |
| 42729 | Cub Run, KY | 15.9 mi |
| 42765 | Munfordville, KY | 16.3 mi |
Questions about 42788
What is the ZIP+4 code for 42788?
42788 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 42788, you need to look up a specific street address to get them.
What city is 42788?
42788 is assigned to White Mills, Kentucky, in Hardin 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.