ZIP Code 42040 — Farmington, KY
42040 is a standard (street delivery) ZIP code serving Farmington, Kentucky, in Graves 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 42040 at a glance
| ZIP code | 42040 |
|---|---|
| Primary city | Farmington |
| State | Kentucky (KY) |
| County | Graves FIPS 21083 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 692 |
| Coordinates | 36.624540, -88.503710 |
How ZIP+4 works in 42040
The four digits after the hyphen encode a delivery segment inside 42040. 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 42040 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 42040.
| ZIP | City | Distance |
|---|---|---|
| 42079 | Sedalia, KY | 6 mi |
| 42054 | Kirksey, KY | 7.5 mi |
| 42066 | Mayfield, KY | 10.7 mi |
| 42071 | Murray, KY | 12.2 mi |
| 42049 | Hazel, KY | 12.6 mi |
| 42020 | Almo, KY | 12.6 mi |
| 38226 | Dukedom, TN | 13.5 mi |
| 42088 | Wingo, KY | 13.9 mi |
| 38241 | Palmersville, TN | 14.3 mi |
| 38251 | Puryear, TN | 14.8 mi |
| 38224 | Cottage Grove, TN | 16.1 mi |
| 42036 | Dexter, KY | 16.6 mi |
Questions about 42040
What is the ZIP+4 code for 42040?
42040 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 42040, you need to look up a specific street address to get them.
What city is 42040?
42040 is assigned to Farmington, Kentucky, in Graves 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.