ZIP Code 53040 — Kewaskum, WI
53040 is a standard (street delivery) ZIP code serving Kewaskum, Wisconsin, in Washington 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 53040 at a glance
| ZIP code | 53040 |
|---|---|
| Primary city | Kewaskum |
| State | Wisconsin (WI) |
| County | Washington FIPS 55131 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 8,630 |
| Coordinates | 43.521260, -88.191980 |
How ZIP+4 works in 53040
The four digits after the hyphen encode a delivery segment inside 53040. 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 53040 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 53040.
| ZIP | City | Distance |
|---|---|---|
| 53090 | West Bend, WI | 4.5 mi |
| 53010 | Campbellsport, WI | 7.6 mi |
| 53002 | Allenton, WI | 8.9 mi |
| 53001 | Adell, WI | 9.1 mi |
| 53095 | West Bend, WI | 9.3 mi |
| 53021 | Fredonia, WI | 9.7 mi |
| 53075 | Random Lake, WI | 10.2 mi |
| 53011 | Cascade, WI | 10.9 mi |
| 53091 | Theresa, WI | 12.4 mi |
| 53080 | Saukville, WI | 12.9 mi |
| 53019 | Eden, WI | 13.4 mi |
| 53048 | Lomira, WI | 13.8 mi |
Questions about 53040
What is the ZIP+4 code for 53040?
53040 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 53040, you need to look up a specific street address to get them.
What city is 53040?
53040 is assigned to Kewaskum, Wisconsin, in Washington 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.