ZIP Code 40763 — Siler, KY
40763 is a standard (street delivery) ZIP code serving Siler, Kentucky, in Whitley 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 40763 at a glance
| ZIP code | 40763 |
|---|---|
| Primary city | Siler |
| State | Kentucky (KY) |
| County | Whitley FIPS 21235 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 411 |
| Coordinates | 36.688480, -83.944030 |
How ZIP+4 works in 40763
The four digits after the hyphen encode a delivery segment inside 40763. 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 40763 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 40763.
| ZIP | City | Distance |
|---|---|---|
| 40940 | Frakes, KY | 5.5 mi |
| 40921 | Bryants Store, KY | 6.9 mi |
| 40995 | Trosper, KY | 8 mi |
| 37730 | Eagan, TN | 8.4 mi |
| 37715 | Clairfield, TN | 9.4 mi |
| 40903 | Artemus, KY | 10.4 mi |
| 40759 | Rockholds, KY | 11 mi |
| 37851 | Pruden, TN | 11.9 mi |
| 40977 | Pineville, KY | 12.2 mi |
| 40965 | Middlesboro, KY | 12.4 mi |
| 37762 | Jellico, TN | 12.6 mi |
| 40769 | Williamsburg, KY | 12.8 mi |
Questions about 40763
What is the ZIP+4 code for 40763?
40763 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 40763, you need to look up a specific street address to get them.
What city is 40763?
40763 is assigned to Siler, Kentucky, in Whitley 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.