ZIP Code 40831 — Harlan, KY
40831 is a standard (street delivery) ZIP code serving Harlan, Kentucky, in Harlan 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 40831 at a glance
| ZIP code | 40831 |
|---|---|
| Primary city | Harlan |
| State | Kentucky (KY) |
| County | Harlan FIPS 21095 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 4,789 |
| Coordinates | 36.764570, -83.334540 |
How ZIP+4 works in 40831
The four digits after the hyphen encode a delivery segment inside 40831. 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 40831 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 40831.
| ZIP | City | Distance |
|---|---|---|
| 40830 | Gulston, KY | 0.8 mi |
| 40964 | Mary Alice, KY | 1.3 mi |
| 40829 | Grays Knob, KY | 3.1 mi |
| 40824 | Dayhoit, KY | 4.7 mi |
| 40873 | Wallins Creek, KY | 5.2 mi |
| 40854 | Loyall, KY | 5.8 mi |
| 40815 | Cawood, KY | 6.1 mi |
| 40818 | Coalgood, KY | 6.3 mi |
| 40863 | Pathfork, KY | 6.4 mi |
| 40819 | Coldiron, KY | 7.7 mi |
| 40801 | Ages Brookside, KY | 7.7 mi |
| 24281 | Rose Hill, VA | 7.9 mi |
Questions about 40831
What is the ZIP+4 code for 40831?
40831 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 40831, you need to look up a specific street address to get them.
What city is 40831?
40831 is assigned to Harlan, Kentucky, in Harlan 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.