ZIP Code 40291 — Louisville, KY
40291 is a standard (street delivery) ZIP code serving Louisville, Kentucky, in Jefferson 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 40291 at a glance
| ZIP code | 40291 |
|---|---|
| Primary city | Louisville |
| State | Kentucky (KY) |
| County | Jefferson FIPS 21111 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Kentucky/Louisville |
| Population | 41,222 |
| Coordinates | 38.127500, -85.578230 |
How ZIP+4 works in 40291
The four digits after the hyphen encode a delivery segment inside 40291. 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 40291 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.
Other ZIP codes in Louisville
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 40291.
| ZIP | City | Distance |
|---|---|---|
| 40228 | Louisville, KY | 2.9 mi |
| 40299 | Louisville, KY | 4.2 mi |
| 40229 | Louisville, KY | 4.9 mi |
| 40218 | Louisville, KY | 6.1 mi |
| 40219 | Louisville, KY | 6.1 mi |
| 40047 | Mount Washington, KY | 6.2 mi |
| 40220 | Louisville, KY | 6.4 mi |
| 40231 | Louisville, KY | 7.9 mi |
| 40243 | Louisville, KY | 8.1 mi |
| 40213 | Louisville, KY | 8.2 mi |
| 40205 | Louisville, KY | 8.7 mi |
| 40023 | Fisherville, KY | 8.7 mi |
Questions about 40291
What is the ZIP+4 code for 40291?
40291 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 40291, you need to look up a specific street address to get them.
What city is 40291?
40291 is assigned to Louisville, Kentucky, in Jefferson 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.