ZIP Code 42445 — Princeton, KY
42445 is a standard (street delivery) ZIP code serving Princeton, Kentucky, in Caldwell 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 42445 at a glance
| ZIP code | 42445 |
|---|---|
| Primary city | Princeton |
| State | Kentucky (KY) |
| County | Caldwell FIPS 21033 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 10,533 |
| Coordinates | 37.128610, -87.860520 |
How ZIP+4 works in 42445
The four digits after the hyphen encode a delivery segment inside 42445. 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 42445 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 42445.
| ZIP | City | Distance |
|---|---|---|
| 42408 | Dawson Springs, KY | 9.9 mi |
| 42411 | Fredonia, KY | 10.6 mi |
| 42038 | Eddyville, KY | 10.8 mi |
| 42215 | Cerulean, KY | 14.1 mi |
| 42453 | Saint Charles, KY | 15.3 mi |
| 42055 | Kuttawa, KY | 17.4 mi |
| 42037 | Dycusburg, KY | 17.9 mi |
| 42450 | Providence, KY | 18.5 mi |
| 42064 | Marion, KY | 19.9 mi |
| 42441 | Nebo, KY | 19.9 mi |
| 42442 | Nortonville, KY | 20.8 mi |
| 42232 | Gracey, KY | 21.1 mi |
Questions about 42445
What is the ZIP+4 code for 42445?
42445 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 42445, you need to look up a specific street address to get them.
What city is 42445?
42445 is assigned to Princeton, Kentucky, in Caldwell 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.