ZIP Code 40109 — Brooks, KY
40109 is a standard (street delivery) ZIP code serving Brooks, Kentucky, in Bullitt 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 40109 at a glance
| ZIP code | 40109 |
|---|---|
| Primary city | Brooks |
| State | Kentucky (KY) |
| County | Bullitt FIPS 21029 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,376 |
| Coordinates | 38.058570, -85.754690 |
How ZIP+4 works in 40109
The four digits after the hyphen encode a delivery segment inside 40109. 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 40109 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 40109.
| ZIP | City | Distance |
|---|---|---|
| 40118 | Fairdale, KY | 2.7 mi |
| 40272 | Louisville, KY | 5.6 mi |
| 40165 | Shepherdsville, KY | 5.7 mi |
| 40229 | Louisville, KY | 5.8 mi |
| 40214 | Louisville, KY | 6.6 mi |
| 40219 | Louisville, KY | 6.6 mi |
| 40213 | Louisville, KY | 8.4 mi |
| 40209 | Louisville, KY | 8.7 mi |
| 40228 | Louisville, KY | 8.8 mi |
| 40221 | Louisville, KY | 8.8 mi |
| 40258 | Louisville, KY | 8.8 mi |
| 40215 | Louisville, KY | 9.3 mi |
Questions about 40109
What is the ZIP+4 code for 40109?
40109 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 40109, you need to look up a specific street address to get them.
What city is 40109?
40109 is assigned to Brooks, Kentucky, in Bullitt 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.