ZIP Code 53103 — Big Bend, WI
53103 is a standard (street delivery) ZIP code serving Big Bend, Wisconsin, in Waukesha 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 53103 at a glance
| ZIP code | 53103 |
|---|---|
| Primary city | Big Bend |
| State | Wisconsin (WI) |
| County | Waukesha FIPS 55133 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 3,762 |
| Coordinates | 42.881750, -88.215420 |
How ZIP+4 works in 53103
The four digits after the hyphen encode a delivery segment inside 53103. 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 53103 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 53103.
| ZIP | City | Distance |
|---|---|---|
| 53150 | Muskego, WI | 4.4 mi |
| 53189 | Waukesha, WI | 5.9 mi |
| 53185 | Waterford, WI | 6.1 mi |
| 53149 | Mukwonago, WI | 6.4 mi |
| 53146 | New Berlin, WI | 6.8 mi |
| 53151 | New Berlin, WI | 8.7 mi |
| 53130 | Hales Corners, WI | 9.3 mi |
| 53127 | Genesee Depot, WI | 9.8 mi |
| 53186 | Waukesha, WI | 9.8 mi |
| 53167 | Rochester, WI | 10.1 mi |
| 53153 | North Prairie, WI | 10.3 mi |
| 53132 | Franklin, WI | 10.4 mi |
Questions about 53103
What is the ZIP+4 code for 53103?
53103 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 53103, you need to look up a specific street address to get them.
What city is 53103?
53103 is assigned to Big Bend, Wisconsin, in Waukesha 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.