ZIP Code 53221 — Milwaukee, WI
53221 is a standard (street delivery) ZIP code serving 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 53221 at a glance
| ZIP code | 53221 |
|---|---|
| Primary city | Milwaukee |
| State | Wisconsin (WI) |
| County | Milwaukee FIPS 55079 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 38,044 |
| Coordinates | 42.954450, -87.943740 |
How ZIP+4 works in 53221
The four digits after the hyphen encode a delivery segment inside 53221. 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 53221 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 Milwaukee
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 53221.
| ZIP | City | Distance |
|---|---|---|
| 53207 | Milwaukee, WI | 2.4 mi |
| 53220 | Milwaukee, WI | 2.5 mi |
| 53129 | Greendale, WI | 3.1 mi |
| 53215 | Milwaukee, WI | 3.1 mi |
| 53219 | Milwaukee, WI | 3.7 mi |
| 53235 | Saint Francis, WI | 3.8 mi |
| 53110 | Cudahy, WI | 4.1 mi |
| 53204 | Milwaukee, WI | 4.5 mi |
| 53295 | Milwaukee, WI | 5 mi |
| 53172 | South Milwaukee, WI | 5 mi |
| 53228 | Milwaukee, WI | 5.1 mi |
| 53130 | Hales Corners, WI | 5.4 mi |
Questions about 53221
What is the ZIP+4 code for 53221?
53221 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 53221, you need to look up a specific street address to get them.
What city is 53221?
53221 is assigned to 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.