ZIP Code 66780 — Walnut, KS
66780 is a standard (street delivery) ZIP code serving Walnut, Kansas, in Crawford 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 66780 at a glance
| ZIP code | 66780 |
|---|---|
| Primary city | Walnut |
| State | Kansas (KS) |
| County | Crawford FIPS 20037 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 674 |
| Coordinates | 37.608950, -95.058810 |
How ZIP+4 works in 66780
The four digits after the hyphen encode a delivery segment inside 66780. 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 66780 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 66780.
| ZIP | City | Distance |
|---|---|---|
| 66746 | Hepler, KS | 7.2 mi |
| 66775 | Stark, KS | 7.9 mi |
| 66771 | Saint Paul, KS | 9.4 mi |
| 66733 | Erie, KS | 10.7 mi |
| 66772 | Savonburg, KS | 11.8 mi |
| 66743 | Girard, KS | 11.8 mi |
| 66734 | Farlington, KS | 13 mi |
| 66732 | Elsmore, KS | 15.2 mi |
| 66779 | Uniontown, KS | 16.4 mi |
| 66753 | Mccune, KS | 17 mi |
| 66712 | Arma, KS | 19 mi |
| 66769 | Redfield, KS | 19.1 mi |
Questions about 66780
What is the ZIP+4 code for 66780?
66780 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 66780, you need to look up a specific street address to get them.
What city is 66780?
66780 is assigned to Walnut, Kansas, in Crawford 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.