ZIP Code 42431 — Madisonville, KY
42431 is a standard (street delivery) ZIP code serving Madisonville, Kentucky, in Hopkins 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 42431 at a glance
| ZIP code | 42431 |
|---|---|
| Primary city | Madisonville |
| State | Kentucky (KY) |
| County | Hopkins FIPS 21107 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 27,207 |
| Coordinates | 37.333190, -87.475120 |
How ZIP+4 works in 42431
The four digits after the hyphen encode a delivery segment inside 42431. 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 42431 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 42431.
| ZIP | City | Distance |
|---|---|---|
| 42410 | Earlington, KY | 4.4 mi |
| 42440 | Mortons Gap, KY | 6.5 mi |
| 42436 | Manitou, KY | 7.6 mi |
| 42413 | Hanson, KY | 7.6 mi |
| 42344 | Graham, KY | 10 mi |
| 42441 | Nebo, KY | 10.4 mi |
| 42442 | Nortonville, KY | 11 mi |
| 42325 | Bremen, KY | 11.1 mi |
| 42464 | White Plains, KY | 11.9 mi |
| 42372 | Sacramento, KY | 12 mi |
| 42456 | Slaughters, KY | 12.4 mi |
| 42453 | Saint Charles, KY | 14 mi |
Questions about 42431
What is the ZIP+4 code for 42431?
42431 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 42431, you need to look up a specific street address to get them.
What city is 42431?
42431 is assigned to Madisonville, Kentucky, in Hopkins 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.