ZIP Code 42078 — Salem, KY
42078 is a standard (street delivery) ZIP code serving Salem, Kentucky, in Livingston 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 42078 at a glance
| ZIP code | 42078 |
|---|---|
| Primary city | Salem |
| State | Kentucky (KY) |
| County | Livingston FIPS 21139 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,702 |
| Coordinates | 37.288760, -88.272020 |
How ZIP+4 works in 42078
The four digits after the hyphen encode a delivery segment inside 42078. 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 42078 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 42078.
| ZIP | City | Distance |
|---|---|---|
| 42028 | Burna, KY | 5.2 mi |
| 42047 | Hampton, KY | 6.6 mi |
| 42081 | Smithland, KY | 8.3 mi |
| 42083 | Tiline, KY | 8.6 mi |
| 42037 | Dycusburg, KY | 10.2 mi |
| 42064 | Marion, KY | 10.8 mi |
| 62982 | Rosiclare, IL | 10.8 mi |
| 42411 | Fredonia, KY | 14.6 mi |
| 42045 | Grand Rivers, KY | 15 mi |
| 42055 | Kuttawa, KY | 16.2 mi |
| 62938 | Golconda, IL | 16.4 mi |
| 62931 | Elizabethtown, IL | 16.5 mi |
Questions about 42078
What is the ZIP+4 code for 42078?
42078 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 42078, you need to look up a specific street address to get them.
What city is 42078?
42078 is assigned to Salem, Kentucky, in Livingston 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.