ZIP Code 42378 — Whitesville, KY
42378 is a standard (street delivery) ZIP code serving Whitesville, Kentucky, in Ohio 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 42378 at a glance
| ZIP code | 42378 |
|---|---|
| Primary city | Whitesville |
| State | Kentucky (KY) |
| County | Ohio FIPS 21183 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 3,513 |
| Coordinates | 37.650930, -86.872580 |
How ZIP+4 works in 42378
The four digits after the hyphen encode a delivery segment inside 42378. 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 42378 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 42378.
| ZIP | City | Distance |
|---|---|---|
| 42366 | Philpot, KY | 6.2 mi |
| 42368 | Reynolds Station, KY | 7.9 mi |
| 42338 | Dundee, KY | 8.6 mi |
| 42347 | Hartford, KY | 8.8 mi |
| 42343 | Fordsville, KY | 9.6 mi |
| 42376 | Utica, KY | 11.9 mi |
| 42303 | Owensboro, KY | 12.3 mi |
| 42361 | Olaton, KY | 13.5 mi |
| 42348 | Hawesville, KY | 13.9 mi |
| 42352 | Livermore, KY | 14.9 mi |
| 42370 | Rosine, KY | 15.6 mi |
| 42355 | Maceo, KY | 15.9 mi |
Questions about 42378
What is the ZIP+4 code for 42378?
42378 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 42378, you need to look up a specific street address to get them.
What city is 42378?
42378 is assigned to Whitesville, Kentucky, in Ohio 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.