ZIP Code 66854 — Hartford, KS
66854 is a standard (street delivery) ZIP code serving Hartford, Kansas, in Lyon 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 66854 at a glance
| ZIP code | 66854 |
|---|---|
| Primary city | Hartford |
| State | Kansas (KS) |
| County | Lyon FIPS 20111 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,007 |
| Coordinates | 38.258720, -95.987350 |
How ZIP+4 works in 66854
The four digits after the hyphen encode a delivery segment inside 66854. 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 66854 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 66854.
| ZIP | City | Distance |
|---|---|---|
| 66864 | Neosho Rapids, KS | 7.1 mi |
| 66839 | Burlington, KS | 13 mi |
| 66860 | Madison, KS | 13.2 mi |
| 66856 | Lebo, KS | 13.3 mi |
| 66852 | Gridley, KS | 13.8 mi |
| 66865 | Olpe, KS | 16.1 mi |
| 66801 | Emporia, KS | 16.5 mi |
| 66868 | Reading, KS | 19.6 mi |
| 66871 | Waverly, KS | 21.2 mi |
| 66857 | Le Roy, KS | 21.9 mi |
| 66870 | Virgil, KS | 22.1 mi |
| 66853 | Hamilton, KS | 22.2 mi |
Questions about 66854
What is the ZIP+4 code for 66854?
66854 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 66854, you need to look up a specific street address to get them.
What city is 66854?
66854 is assigned to Hartford, Kansas, in Lyon 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.