ZIP Code 53503 — Arena, WI
53503 is a standard (street delivery) ZIP code serving Arena, Wisconsin, in Iowa 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 53503 at a glance
| ZIP code | 53503 |
|---|---|
| Primary city | Arena |
| State | Wisconsin (WI) |
| County | Iowa FIPS 55049 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,057 |
| Coordinates | 43.139350, -89.956230 |
How ZIP+4 works in 53503
The four digits after the hyphen encode a delivery segment inside 53503. 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 53503 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 53503.
| ZIP | City | Distance |
|---|---|---|
| 53588 | Spring Green, WI | 7.2 mi |
| 53582 | Ridgeway, WI | 8.6 mi |
| 53517 | Blue Mounds, WI | 9.5 mi |
| 53507 | Barneveld, WI | 9.9 mi |
| 53515 | Black Earth, WI | 10.5 mi |
| 53583 | Sauk City, WI | 10.9 mi |
| 53560 | Mazomanie, WI | 10.9 mi |
| 53577 | Plain, WI | 13.4 mi |
| 53533 | Dodgeville, WI | 14 mi |
| 53578 | Prairie Du Sac, WI | 15.1 mi |
| 53556 | Lone Rock, WI | 16.1 mi |
| 53528 | Cross Plains, WI | 16.1 mi |
Questions about 53503
What is the ZIP+4 code for 53503?
53503 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 53503, you need to look up a specific street address to get them.
What city is 53503?
53503 is assigned to Arena, Wisconsin, in Iowa 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.