ZIP Code 66078 — Princeton, KS
66078 is a standard (street delivery) ZIP code serving Princeton, Kansas, in Franklin 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 66078 at a glance
| ZIP code | 66078 |
|---|---|
| Primary city | Princeton |
| State | Kansas (KS) |
| County | Franklin FIPS 20059 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 805 |
| Coordinates | 38.483210, -95.262100 |
How ZIP+4 works in 66078
The four digits after the hyphen encode a delivery segment inside 66078. 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 66078 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 66078.
| ZIP | City | Distance |
|---|---|---|
| 66080 | Richmond, KS | 5.4 mi |
| 66079 | Rantoul, KS | 8.9 mi |
| 66095 | Williamsburg, KS | 9.4 mi |
| 66067 | Ottawa, KS | 9.4 mi |
| 66042 | Lane, KS | 10.4 mi |
| 66033 | Greeley, KS | 11.2 mi |
| 66076 | Pomona, KS | 13.8 mi |
| 66032 | Garnett, KS | 14 mi |
| 66064 | Osawatomie, KS | 14.9 mi |
| 66528 | Quenemo, KS | 16.7 mi |
| 66092 | Wellsville, KS | 16.8 mi |
| 66510 | Melvern, KS | 18.8 mi |
Questions about 66078
What is the ZIP+4 code for 66078?
66078 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 66078, you need to look up a specific street address to get them.
What city is 66078?
66078 is assigned to Princeton, Kansas, in Franklin 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.