ZIP Code 40078 — Willisburg, KY
40078 is a standard (street delivery) ZIP code serving Willisburg, Kentucky, in Washington 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 40078 at a glance
| ZIP code | 40078 |
|---|---|
| Primary city | Willisburg |
| State | Kentucky (KY) |
| County | Washington FIPS 21229 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,661 |
| Coordinates | 37.842720, -85.149020 |
How ZIP+4 works in 40078
The four digits after the hyphen encode a delivery segment inside 40078. 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 40078 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 40078.
| ZIP | City | Distance |
|---|---|---|
| 40012 | Chaplin, KY | 4.6 mi |
| 40040 | Mackville, KY | 6.9 mi |
| 40008 | Bloomfield, KY | 8.8 mi |
| 40069 | Springfield, KY | 9.5 mi |
| 40061 | Saint Catharine, KY | 11.1 mi |
| 40046 | Mount Eden, KY | 12.6 mi |
| 40342 | Lawrenceburg, KY | 14.3 mi |
| 40020 | Fairfield, KY | 14.5 mi |
| 40330 | Harrodsburg, KY | 14.6 mi |
| 40372 | Salvisa, KY | 15.1 mi |
| 40468 | Perryville, KY | 15.8 mi |
| 40004 | Bardstown, KY | 17.7 mi |
Questions about 40078
What is the ZIP+4 code for 40078?
40078 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 40078, you need to look up a specific street address to get them.
What city is 40078?
40078 is assigned to Willisburg, Kentucky, in Washington 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.