ZIP Code 40440 — Junction City, KY
40440 is a standard (street delivery) ZIP code serving Junction City, Kentucky, in Boyle 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 40440 at a glance
| ZIP code | 40440 |
|---|---|
| Primary city | Junction City |
| State | Kentucky (KY) |
| County | Boyle FIPS 21021 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,428 |
| Coordinates | 37.576280, -84.832200 |
How ZIP+4 works in 40440
The four digits after the hyphen encode a delivery segment inside 40440. 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 40440 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 40440.
| ZIP | City | Distance |
|---|---|---|
| 40464 | Parksville, KY | 4.6 mi |
| 40422 | Danville, KY | 4.8 mi |
| 40437 | Hustonville, KY | 9.1 mi |
| 40448 | Mckinney, KY | 9.2 mi |
| 40484 | Stanford, KY | 9.5 mi |
| 40468 | Perryville, KY | 10 mi |
| 40328 | Gravel Switch, KY | 10.6 mi |
| 40310 | Burgin, KY | 12.6 mi |
| 42541 | Middleburg, KY | 14.1 mi |
| 40330 | Harrodsburg, KY | 15 mi |
| 40444 | Lancaster, KY | 15.1 mi |
| 40009 | Bradfordsville, KY | 16.3 mi |
Questions about 40440
What is the ZIP+4 code for 40440?
40440 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 40440, you need to look up a specific street address to get them.
What city is 40440?
40440 is assigned to Junction City, Kentucky, in Boyle 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.