ZIP Code 66451 — Lyndon, KS
66451 is a standard (street delivery) ZIP code serving Lyndon, Kansas, in Osage 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 66451 at a glance
| ZIP code | 66451 |
|---|---|
| Primary city | Lyndon |
| State | Kansas (KS) |
| County | Osage FIPS 20139 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,671 |
| Coordinates | 38.608410, -95.672360 |
How ZIP+4 works in 66451
The four digits after the hyphen encode a delivery segment inside 66451. 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 66451 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 66451.
| ZIP | City | Distance |
|---|---|---|
| 66543 | Vassar, KS | 4.5 mi |
| 66528 | Quenemo, KS | 7.5 mi |
| 66510 | Melvern, KS | 8.6 mi |
| 66523 | Osage City, KS | 8.9 mi |
| 66537 | Scranton, KS | 10.2 mi |
| 66076 | Pomona, KS | 12.6 mi |
| 66414 | Carbondale, KS | 15.1 mi |
| 66524 | Overbrook, KS | 15.4 mi |
| 66413 | Burlingame, KS | 16.1 mi |
| 66856 | Lebo, KS | 16.5 mi |
| 66095 | Williamsburg, KS | 17.2 mi |
| 66868 | Reading, KS | 17.4 mi |
Questions about 66451
What is the ZIP+4 code for 66451?
66451 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 66451, you need to look up a specific street address to get them.
What city is 66451?
66451 is assigned to Lyndon, Kansas, in Osage 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.