ZIP Code 40391 — Winchester, KY
40391 is a standard (street delivery) ZIP code serving Winchester, Kentucky, in Clark 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 40391 at a glance
| ZIP code | 40391 |
|---|---|
| Primary city | Winchester |
| State | Kentucky (KY) |
| County | Clark FIPS 21049 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 36,796 |
| Coordinates | 37.969690, -84.145070 |
How ZIP+4 works in 40391
The four digits after the hyphen encode a delivery segment inside 40391. 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 40391 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 40391.
| ZIP | City | Distance |
|---|---|---|
| 40509 | Lexington, KY | 12.2 mi |
| 40357 | North Middletown, KY | 12.3 mi |
| 40353 | Mount Sterling, KY | 12.6 mi |
| 40516 | Lexington, KY | 14 mi |
| 40312 | Clay City, KY | 14.6 mi |
| 40515 | Lexington, KY | 15.1 mi |
| 40337 | Jeffersonville, KY | 15.7 mi |
| 40385 | Waco, KY | 16 mi |
| 40361 | Paris, KY | 16.8 mi |
| 40475 | Richmond, KY | 16.8 mi |
| 40505 | Lexington, KY | 18.1 mi |
| 40502 | Lexington, KY | 18.6 mi |
Questions about 40391
What is the ZIP+4 code for 40391?
40391 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 40391, you need to look up a specific street address to get them.
What city is 40391?
40391 is assigned to Winchester, Kentucky, in Clark 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.