ZIP Code 40829 — Grays Knob, KY
40829 is a standard (street delivery) ZIP code serving Grays Knob, 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 40829 at a glance
| ZIP code | 40829 |
|---|---|
| Primary city | Grays Knob |
| State | Kentucky (KY) |
| County | Harlan FIPS 21095 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 62 |
| Coordinates | 36.798000, -83.296550 |
How ZIP+4 works in 40829
The four digits after the hyphen encode a delivery segment inside 40829. 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 40829 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 40829.
| ZIP | City | Distance |
|---|---|---|
| 40830 | Gulston, KY | 2.4 mi |
| 40964 | Mary Alice, KY | 2.5 mi |
| 40831 | Harlan, KY | 3.1 mi |
| 40818 | Coalgood, KY | 3.3 mi |
| 40815 | Cawood, KY | 3.8 mi |
| 40824 | Dayhoit, KY | 4.6 mi |
| 40801 | Ages Brookside, KY | 4.7 mi |
| 40854 | Loyall, KY | 4.7 mi |
| 40806 | Baxter, KY | 6.1 mi |
| 40873 | Wallins Creek, KY | 6.1 mi |
| 40820 | Cranks, KY | 7.4 mi |
| 40847 | Kenvir, KY | 8.5 mi |
Questions about 40829
What is the ZIP+4 code for 40829?
40829 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 40829, you need to look up a specific street address to get them.
What city is 40829?
40829 is assigned to Grays Knob, 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.