ZIP Code 54643 — Millston, WI
54643 is a standard (street delivery) ZIP code serving Millston, Wisconsin, in Jackson 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 54643 at a glance
| ZIP code | 54643 |
|---|---|
| Primary city | Millston |
| State | Wisconsin (WI) |
| County | Jackson FIPS 55053 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2 |
| Coordinates | 44.187580, -90.634320 |
How ZIP+4 works in 54643
The four digits after the hyphen encode a delivery segment inside 54643. 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 54643 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 54643.
| ZIP | City | Distance |
|---|---|---|
| 54615 | Black River Falls, WI | 8.9 mi |
| 54666 | Warrens, WI | 9.8 mi |
| 54656 | Sparta, WI | 15 mi |
| 54660 | Tomah, WI | 15.4 mi |
| 54754 | Merrillan, WI | 18.1 mi |
| 54466 | Pittsville, WI | 20.8 mi |
| 54642 | Melrose, WI | 20.9 mi |
| 54644 | Mindoro, WI | 22.9 mi |
| 54618 | Camp Douglas, WI | 23.2 mi |
| 54611 | Alma Center, WI | 23.8 mi |
| 54648 | Norwalk, WI | 24.3 mi |
| 54659 | Taylor, WI | 24.3 mi |
Questions about 54643
What is the ZIP+4 code for 54643?
54643 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 54643, you need to look up a specific street address to get them.
What city is 54643?
54643 is assigned to Millston, Wisconsin, in Jackson 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.