ZIP Code 53566 — Monroe, WI
53566 is a standard (street delivery) ZIP code serving Monroe, Wisconsin, in Green 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 53566 at a glance
| ZIP code | 53566 |
|---|---|
| Primary city | Monroe |
| State | Wisconsin (WI) |
| County | Green FIPS 55045 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 14,901 |
| Coordinates | 42.609120, -89.648170 |
How ZIP+4 works in 53566
The four digits after the hyphen encode a delivery segment inside 53566. 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 53566 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 53566.
| ZIP | City | Distance |
|---|---|---|
| 53522 | Browntown, WI | 8.1 mi |
| 53550 | Juda, WI | 8.6 mi |
| 53570 | Monticello, WI | 9 mi |
| 61060 | Orangeville, IL | 9.1 mi |
| 53599 | Woodford, WI | 11.1 mi |
| 53504 | Argyle, WI | 12.5 mi |
| 61050 | Mcconnell, IL | 12.5 mi |
| 61089 | Winslow, IL | 12.9 mi |
| 53587 | South Wayne, WI | 13.2 mi |
| 53502 | Albany, WI | 13.5 mi |
| 61018 | Dakota, IL | 14.1 mi |
| 53574 | New Glarus, WI | 14.4 mi |
Questions about 53566
What is the ZIP+4 code for 53566?
53566 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 53566, you need to look up a specific street address to get them.
What city is 53566?
53566 is assigned to Monroe, Wisconsin, in Green 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.