ZIP Code 40010 — Buckner, KY
40010 is a standard (street delivery) ZIP code serving Buckner, Kentucky, in Oldham 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 40010 at a glance
| ZIP code | 40010 |
|---|---|
| Primary city | Buckner |
| State | Kentucky (KY) |
| County | Oldham FIPS 21185 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 678 |
| Coordinates | 38.372260, -85.454310 |
How ZIP+4 works in 40010
The four digits after the hyphen encode a delivery segment inside 40010. 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 40010 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 40010.
| ZIP | City | Distance |
|---|---|---|
| 40014 | Crestwood, KY | 2.5 mi |
| 40056 | Pewee Valley, KY | 4.9 mi |
| 40031 | La Grange, KY | 5 mi |
| 40026 | Goshen, KY | 5.5 mi |
| 40059 | Prospect, KY | 7.1 mi |
| 40245 | Louisville, KY | 7.4 mi |
| 40241 | Louisville, KY | 8.2 mi |
| 40077 | Westport, KY | 8.9 mi |
| 40223 | Louisville, KY | 9 mi |
| 40242 | Louisville, KY | 9.9 mi |
| 40068 | Smithfield, KY | 10 mi |
| 40243 | Louisville, KY | 10.1 mi |
Questions about 40010
What is the ZIP+4 code for 40010?
40010 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 40010, you need to look up a specific street address to get them.
What city is 40010?
40010 is assigned to Buckner, Kentucky, in Oldham 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.