ZIP Code 41503 — South Williamson, KY
41503 is a standard (street delivery) ZIP code serving South Williamson, Kentucky, in Pike 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 41503 at a glance
| ZIP code | 41503 |
|---|---|
| Primary city | South Williamson |
| State | Kentucky (KY) |
| County | Pike FIPS 21195 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 472 |
| Coordinates | 37.660790, -82.284460 |
How ZIP+4 works in 41503
The four digits after the hyphen encode a delivery segment inside 41503. 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 41503 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 41503.
| ZIP | City | Distance |
|---|---|---|
| 41527 | Forest Hills, KY | 2.1 mi |
| 41514 | Belfry, KY | 2.7 mi |
| 25667 | Chattaroy, WV | 3.2 mi |
| 25661 | Williamson, WV | 3.8 mi |
| 41535 | Huddy, KY | 4.6 mi |
| 41531 | Hardy, KY | 5.4 mi |
| 41519 | Canada, KY | 5.7 mi |
| 41564 | Sidney, KY | 5.9 mi |
| 41567 | Stone, KY | 6.3 mi |
| 25688 | North Matewan, WV | 7 mi |
| 25690 | Ragland, WV | 7.4 mi |
| 41544 | Mccarr, KY | 7.5 mi |
Questions about 41503
What is the ZIP+4 code for 41503?
41503 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 41503, you need to look up a specific street address to get them.
What city is 41503?
41503 is assigned to South Williamson, Kentucky, in Pike 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.