ZIP Code 53172 — South Milwaukee, WI
53172 is a standard (street delivery) ZIP code serving South Milwaukee, Wisconsin, in Milwaukee 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 53172 at a glance
| ZIP code | 53172 |
|---|---|
| Primary city | South Milwaukee |
| State | Wisconsin (WI) |
| County | Milwaukee FIPS 55079 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 20,442 |
| Coordinates | 42.911970, -87.862660 |
How ZIP+4 works in 53172
The four digits after the hyphen encode a delivery segment inside 53172. 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 53172 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 53172.
| ZIP | City | Distance |
|---|---|---|
| 53110 | Cudahy, WI | 2.4 mi |
| 53154 | Oak Creek, WI | 2.9 mi |
| 53235 | Saint Francis, WI | 4.1 mi |
| 53207 | Milwaukee, WI | 4.6 mi |
| 53221 | Milwaukee, WI | 5 mi |
| 53129 | Greendale, WI | 7.2 mi |
| 53215 | Milwaukee, WI | 7.4 mi |
| 53220 | Milwaukee, WI | 7.5 mi |
| 53108 | Caledonia, WI | 7.6 mi |
| 53132 | Franklin, WI | 7.7 mi |
| 53402 | Racine, WI | 8 mi |
| 53204 | Milwaukee, WI | 8 mi |
Questions about 53172
What is the ZIP+4 code for 53172?
53172 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 53172, you need to look up a specific street address to get them.
What city is 53172?
53172 is assigned to South Milwaukee, Wisconsin, in Milwaukee 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.