ZIP Code 54143 — Marinette, WI
54143 is a standard (street delivery) ZIP code serving Marinette, Wisconsin, in Marinette 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 54143 at a glance
| ZIP code | 54143 |
|---|---|
| Primary city | Marinette |
| State | Wisconsin (WI) |
| County | Marinette FIPS 55075 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 15,119 |
| Coordinates | 45.087080, -87.700450 |
How ZIP+4 works in 54143
The four digits after the hyphen encode a delivery segment inside 54143. 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 54143 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 54143.
| ZIP | City | Distance |
|---|---|---|
| 54157 | Peshtigo, WI | 6 mi |
| 54159 | Porterfield, WI | 9.9 mi |
| 49858 | Menominee, MI | 10.8 mi |
| 49893 | Wallace, MI | 15.3 mi |
| 54153 | Oconto, WI | 17 mi |
| 54112 | Coleman, WI | 17.1 mi |
| 54139 | Lena, WI | 20.3 mi |
| 49848 | Ingalls, MI | 20.4 mi |
| 54177 | Wausaukee, WI | 21.3 mi |
| 54209 | Egg Harbor, WI | 21.5 mi |
| 54161 | Pound, WI | 22.4 mi |
| 54204 | Brussels, WI | 22.8 mi |
Questions about 54143
What is the ZIP+4 code for 54143?
54143 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 54143, you need to look up a specific street address to get them.
What city is 54143?
54143 is assigned to Marinette, Wisconsin, in Marinette 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.