ZIP Code 42350 — Island, KY
42350 is a standard (street delivery) ZIP code serving Island, Kentucky, in McLean 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 42350 at a glance
| ZIP code | 42350 |
|---|---|
| Primary city | Island |
| State | Kentucky (KY) |
| County | McLean FIPS 21149 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,342 |
| Coordinates | 37.448520, -87.183100 |
How ZIP+4 works in 42350
The four digits after the hyphen encode a delivery segment inside 42350. 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 42350 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 42350.
| ZIP | City | Distance |
|---|---|---|
| 42372 | Sacramento, KY | 5.9 mi |
| 42371 | Rumsey, KY | 6.9 mi |
| 42352 | Livermore, KY | 7.1 mi |
| 42328 | Centertown, KY | 7.9 mi |
| 42374 | South Carrollton, KY | 8.3 mi |
| 42330 | Central City, KY | 9.8 mi |
| 42325 | Bremen, KY | 9.8 mi |
| 42327 | Calhoun, KY | 11.5 mi |
| 42369 | Rockport, KY | 11.7 mi |
| 42376 | Utica, KY | 12.7 mi |
| 42367 | Powderly, KY | 14.1 mi |
| 42332 | Cleaton, KY | 14.6 mi |
Questions about 42350
What is the ZIP+4 code for 42350?
42350 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 42350, you need to look up a specific street address to get them.
What city is 42350?
42350 is assigned to Island, Kentucky, in McLean 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.