ZIP Code 66531 — Riley, KS
66531 is a standard (street delivery) ZIP code serving Riley, Kansas, in Riley 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 66531 at a glance
| ZIP code | 66531 |
|---|---|
| Primary city | Riley |
| State | Kansas (KS) |
| County | Riley FIPS 20161 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,256 |
| Coordinates | 39.311460, -96.834160 |
How ZIP+4 works in 66531
The four digits after the hyphen encode a delivery segment inside 66531. 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 66531 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 66531.
| ZIP | City | Distance |
|---|---|---|
| 66449 | Leonardville, KS | 5.5 mi |
| 66503 | Manhattan, KS | 8.6 mi |
| 66554 | Randolph, KS | 12.5 mi |
| 66514 | Milford, KS | 13 mi |
| 66520 | Olsburg, KS | 13.5 mi |
| 67447 | Green, KS | 13.8 mi |
| 66442 | Fort Riley, KS | 15.3 mi |
| 66517 | Ogden, KS | 15.4 mi |
| 67487 | Wakefield, KS | 15.5 mi |
| 66506 | Manhattan, KS | 15.7 mi |
| 67432 | Clay Center, KS | 18.5 mi |
| 66502 | Manhattan, KS | 20.1 mi |
Questions about 66531
What is the ZIP+4 code for 66531?
66531 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 66531, you need to look up a specific street address to get them.
What city is 66531?
66531 is assigned to Riley, Kansas, in Riley 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.