ZIP Code 54123 — Forest Junction, WI
54123 is a standard (street delivery) ZIP code serving Forest Junction, Wisconsin, in Calumet 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 54123 at a glance
| ZIP code | 54123 |
|---|---|
| Primary city | Forest Junction |
| State | Wisconsin (WI) |
| County | Calumet FIPS 55015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 204 |
| Coordinates | 44.206420, -88.152010 |
How ZIP+4 works in 54123
The four digits after the hyphen encode a delivery segment inside 54123. 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 54123 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 54123.
| ZIP | City | Distance |
|---|---|---|
| 54110 | Brillion, WI | 3.8 mi |
| 54129 | Hilbert, WI | 5.9 mi |
| 54169 | Sherwood, WI | 6.5 mi |
| 54160 | Potter, WI | 6.5 mi |
| 54126 | Greenleaf, WI | 8.2 mi |
| 54130 | Kaukauna, WI | 8.6 mi |
| 54113 | Combined Locks, WI | 8.6 mi |
| 54180 | Wrightstown, WI | 8.7 mi |
| 54952 | Menasha, WI | 9.2 mi |
| 54140 | Little Chute, WI | 9.6 mi |
| 54136 | Kimberly, WI | 10.2 mi |
| 54915 | Appleton, WI | 10.6 mi |
Questions about 54123
What is the ZIP+4 code for 54123?
54123 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 54123, you need to look up a specific street address to get them.
What city is 54123?
54123 is assigned to Forest Junction, Wisconsin, in Calumet 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.