ZIP Code 53940 — Lake Delton, WI
53940 is a standard (street delivery) ZIP code serving Lake Delton, Wisconsin, in Sauk 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 53940 at a glance
| ZIP code | 53940 |
|---|---|
| Primary city | Lake Delton |
| State | Wisconsin (WI) |
| County | Sauk FIPS 55111 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Coordinates | 43.591260, -89.794400 |
How ZIP+4 works in 53940
The four digits after the hyphen encode a delivery segment inside 53940. 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 53940 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 53940.
| ZIP | City | Distance |
|---|---|---|
| 53965 | Wisconsin Dells, WI | 6.2 mi |
| 53913 | Baraboo, WI | 7.6 mi |
| 53944 | Lyndon Station, WI | 9.4 mi |
| 53920 | Briggsville, WI | 10.8 mi |
| 53959 | Reedsburg, WI | 10.9 mi |
| 53961 | Rock Springs, WI | 11.5 mi |
| 53951 | North Freedom, WI | 14.3 mi |
| 53561 | Merrimac, WI | 15.4 mi |
| 53901 | Portage, WI | 15.6 mi |
| 53930 | Endeavor, WI | 16.2 mi |
| 53952 | Oxford, WI | 16.8 mi |
| 53941 | La Valle, WI | 17.1 mi |
Questions about 53940
What is the ZIP+4 code for 53940?
53940 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 53940, you need to look up a specific street address to get them.
What city is 53940?
53940 is assigned to Lake Delton, Wisconsin, in Sauk 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.