ZIP Code 42066 — Mayfield, KY
42066 is a standard (street delivery) ZIP code serving Mayfield, 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 42066 at a glance
| ZIP code | 42066 |
|---|---|
| Primary city | Mayfield |
| State | Kentucky (KY) |
| County | Graves FIPS 21083 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 23,917 |
| Coordinates | 36.733280, -88.640300 |
How ZIP+4 works in 42066
The four digits after the hyphen encode a delivery segment inside 42066. 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 42066 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 42066.
| ZIP | City | Distance |
|---|---|---|
| 42051 | Hickory, KY | 8.5 mi |
| 42088 | Wingo, KY | 10.1 mi |
| 42040 | Farmington, KY | 10.6 mi |
| 42039 | Fancy Farm, KY | 11 mi |
| 42054 | Kirksey, KY | 11.6 mi |
| 42079 | Sedalia, KY | 12.5 mi |
| 42061 | Lowes, KY | 12.5 mi |
| 42027 | Boaz, KY | 12.6 mi |
| 42085 | Water Valley, KY | 14.4 mi |
| 42069 | Melber, KY | 14.6 mi |
| 42082 | Symsonia, KY | 14.8 mi |
| 42035 | Cunningham, KY | 16 mi |
Questions about 42066
What is the ZIP+4 code for 42066?
42066 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 42066, you need to look up a specific street address to get them.
What city is 42066?
42066 is assigned to Mayfield, 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.