ZIP Code 42274 — Rockfield, KY
42274 is a standard (street delivery) ZIP code serving Rockfield, Kentucky, in Warren 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 42274 at a glance
| ZIP code | 42274 |
|---|---|
| Primary city | Rockfield |
| State | Kentucky (KY) |
| County | Warren FIPS 21227 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,157 |
| Coordinates | 36.949150, -86.605340 |
How ZIP+4 works in 42274
The four digits after the hyphen encode a delivery segment inside 42274. 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 42274 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 42274.
| ZIP | City | Distance |
|---|---|---|
| 42170 | Woodburn, KY | 7.3 mi |
| 42206 | Auburn, KY | 8 mi |
| 42104 | Bowling Green, KY | 9.8 mi |
| 42101 | Bowling Green, KY | 10.7 mi |
| 42103 | Bowling Green, KY | 15 mi |
| 42122 | Alvaton, KY | 15 mi |
| 42134 | Franklin, KY | 15.5 mi |
| 42276 | Russellville, KY | 16.2 mi |
| 42261 | Morgantown, KY | 19.3 mi |
| 42256 | Lewisburg, KY | 19.5 mi |
| 42159 | Oakland, KY | 20 mi |
| 42252 | Jetson, KY | 20.7 mi |
Questions about 42274
What is the ZIP+4 code for 42274?
42274 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 42274, you need to look up a specific street address to get them.
What city is 42274?
42274 is assigned to Rockfield, Kentucky, in Warren 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.