ZIP Code 53538 — Fort Atkinson, WI
53538 is a standard (street delivery) ZIP code serving Fort Atkinson, Wisconsin, in Jefferson 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 53538 at a glance
| ZIP code | 53538 |
|---|---|
| Primary city | Fort Atkinson |
| State | Wisconsin (WI) |
| County | Jefferson FIPS 55055 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 18,813 |
| Coordinates | 42.916970, -88.871940 |
How ZIP+4 works in 53538
The four digits after the hyphen encode a delivery segment inside 53538. 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 53538 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 53538.
| ZIP | City | Distance |
|---|---|---|
| 53549 | Jefferson, WI | 7 mi |
| 53523 | Cambridge, WI | 9.3 mi |
| 53563 | Milton, WI | 9.7 mi |
| 53190 | Whitewater, WI | 10.4 mi |
| 53551 | Lake Mills, WI | 11.3 mi |
| 53137 | Helenville, WI | 11.9 mi |
| 53534 | Edgerton, WI | 12 mi |
| 53038 | Johnson Creek, WI | 12.4 mi |
| 53156 | Palmyra, WI | 14.4 mi |
| 53531 | Deerfield, WI | 15.1 mi |
| 53545 | Janesville, WI | 15.3 mi |
| 53178 | Sullivan, WI | 15.6 mi |
Questions about 53538
What is the ZIP+4 code for 53538?
53538 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 53538, you need to look up a specific street address to get them.
What city is 53538?
53538 is assigned to Fort Atkinson, Wisconsin, in Jefferson 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.