ZIP Code 54645 — Mount Sterling, WI
54645 is a standard (street delivery) ZIP code serving Mount Sterling, Wisconsin, 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 54645 at a glance
| ZIP code | 54645 |
|---|---|
| Primary city | Mount Sterling |
| State | Wisconsin (WI) |
| County | Crawford FIPS 55023 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 97 |
| Coordinates | 43.320840, -90.929010 |
How ZIP+4 works in 54645
The four digits after the hyphen encode a delivery segment inside 54645. 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 54645 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 54645.
| ZIP | City | Distance |
|---|---|---|
| 54654 | Seneca, WI | 3.8 mi |
| 54631 | Gays Mills, WI | 5.3 mi |
| 54628 | Ferryville, WI | 6.2 mi |
| 54657 | Steuben, WI | 8.8 mi |
| 54626 | Eastman, WI | 9 mi |
| 54655 | Soldiers Grove, WI | 9.2 mi |
| 54652 | Readstown, WI | 12.6 mi |
| 53826 | Wauzeka, WI | 13.7 mi |
| 54624 | De Soto, WI | 14.6 mi |
| 54665 | Viroqua, WI | 14.6 mi |
| 52146 | Harpers Ferry, IA | 16.2 mi |
| 53805 | Boscobel, WI | 17.4 mi |
Questions about 54645
What is the ZIP+4 code for 54645?
54645 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 54645, you need to look up a specific street address to get them.
What city is 54645?
54645 is assigned to Mount Sterling, Wisconsin, 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.