ZIP Code 42437 — Morganfield, KY
42437 is a standard (street delivery) ZIP code serving Morganfield, Kentucky, in Union 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 42437 at a glance
| ZIP code | 42437 |
|---|---|
| Primary city | Morganfield |
| State | Kentucky (KY) |
| County | Union FIPS 21225 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 7,064 |
| Coordinates | 37.662340, -87.920670 |
How ZIP+4 works in 42437
The four digits after the hyphen encode a delivery segment inside 42437. 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 42437 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 42437.
| ZIP | City | Distance |
|---|---|---|
| 42459 | Sturgis, KY | 8.6 mi |
| 42462 | Waverly, KY | 8.6 mi |
| 42461 | Uniontown, KY | 8.8 mi |
| 42406 | Corydon, KY | 12.5 mi |
| 42463 | Wheatcroft, KY | 13 mi |
| 62984 | Shawneetown, IL | 13.4 mi |
| 42404 | Clay, KY | 13.5 mi |
| 42409 | Dixon, KY | 14.6 mi |
| 42444 | Poole, KY | 15.1 mi |
| 62919 | Cave In Rock, IL | 15.7 mi |
| 47620 | Mount Vernon, IN | 18.7 mi |
| 62867 | New Haven, IL | 19.4 mi |
Questions about 42437
What is the ZIP+4 code for 42437?
42437 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 42437, you need to look up a specific street address to get them.
What city is 42437?
42437 is assigned to Morganfield, Kentucky, in Union 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.