ZIP Code 54902 — Oshkosh, WI
54902 is a standard (street delivery) ZIP code serving Oshkosh, Wisconsin, in Winnebago 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 54902 at a glance
| ZIP code | 54902 |
|---|---|
| Primary city | Oshkosh |
| State | Wisconsin (WI) |
| County | Winnebago FIPS 55139 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 22,243 |
| Coordinates | 43.949340, -88.539690 |
How ZIP+4 works in 54902
The four digits after the hyphen encode a delivery segment inside 54902. 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 54902 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.
Other ZIP codes in Oshkosh
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 54902.
| ZIP | City | Distance |
|---|---|---|
| 54979 | Van Dyne, WI | 5.6 mi |
| 54904 | Oshkosh, WI | 6.7 mi |
| 54901 | Oshkosh, WI | 7.8 mi |
| 54985 | Winnebago, WI | 8.8 mi |
| 54932 | Eldorado, WI | 9 mi |
| 54964 | Pickett, WI | 9.1 mi |
| 54980 | Waukau, WI | 11.7 mi |
| 54927 | Butte Des Morts, WI | 12 mi |
| 54963 | Omro, WI | 13.1 mi |
| 54974 | Rosendale, WI | 13.1 mi |
| 54935 | Fond Du Lac, WI | 13.1 mi |
| 53049 | Malone, WI | 13.2 mi |
Questions about 54902
What is the ZIP+4 code for 54902?
54902 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 54902, you need to look up a specific street address to get them.
What city is 54902?
54902 is assigned to Oshkosh, Wisconsin, in Winnebago 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.