ZIP Code 66842 — Cassoday, KS
66842 is a standard (street delivery) ZIP code serving Cassoday, Kansas, in Butler 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 66842 at a glance
| ZIP code | 66842 |
|---|---|
| Primary city | Cassoday |
| State | Kansas (KS) |
| County | Butler FIPS 20015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 508 |
| Coordinates | 38.023600, -96.658360 |
How ZIP+4 works in 66842
The four digits after the hyphen encode a delivery segment inside 66842. 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 66842 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 66842.
| ZIP | City | Distance |
|---|---|---|
| 66862 | Matfield Green, KS | 10.7 mi |
| 66840 | Burns, KS | 12.1 mi |
| 67132 | Rosalia, KS | 12.6 mi |
| 67042 | El Dorado, KS | 14.3 mi |
| 66843 | Cedar Point, KS | 14.9 mi |
| 67123 | Potwin, KS | 19 mi |
| 66851 | Florence, KS | 19.9 mi |
| 66845 | Cottonwood Falls, KS | 20.5 mi |
| 67045 | Eureka, KS | 21.1 mi |
| 66853 | Hamilton, KS | 22.6 mi |
| 67144 | Towanda, KS | 23.7 mi |
| 66865 | Olpe, KS | 24.6 mi |
Questions about 66842
What is the ZIP+4 code for 66842?
66842 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 66842, you need to look up a specific street address to get them.
What city is 66842?
66842 is assigned to Cassoday, Kansas, in Butler 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.