ZIP Code 54151 — Niagara, WI
54151 is a standard (street delivery) ZIP code serving Niagara, 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 54151 at a glance
| ZIP code | 54151 |
|---|---|
| Primary city | Niagara |
| State | Wisconsin (WI) |
| County | Marinette FIPS 55075 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 3,411 |
| Coordinates | 45.723520, -87.997520 |
How ZIP+4 works in 54151
The four digits after the hyphen encode a delivery segment inside 54151. 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 54151 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 54151.
| ZIP | City | Distance |
|---|---|---|
| 49876 | Quinnesec, MI | 5.5 mi |
| 49802 | Kingsford, MI | 6.6 mi |
| 54156 | Pembine, WI | 8.9 mi |
| 49852 | Loretto, MI | 9.6 mi |
| 54119 | Dunbar, WI | 11.2 mi |
| 49892 | Vulcan, MI | 11.4 mi |
| 49870 | Norway, MI | 11.4 mi |
| 49801 | Iron Mountain, MI | 13.5 mi |
| 54102 | Amberg, WI | 15.2 mi |
| 49847 | Hermansville, MI | 17.6 mi |
| 54121 | Florence, WI | 18.7 mi |
| 54125 | Goodman, WI | 20.7 mi |
Questions about 54151
What is the ZIP+4 code for 54151?
54151 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 54151, you need to look up a specific street address to get them.
What city is 54151?
54151 is assigned to Niagara, 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.