ZIP Code 57042 — Madison, SD
57042 is a standard (street delivery) ZIP code serving Madison, South Dakota, in Lake 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 57042 at a glance
| ZIP code | 57042 |
|---|---|
| Primary city | Madison |
| State | South Dakota (SD) |
| County | Lake FIPS 46079 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 7,756 |
| Coordinates | 43.977440, -97.151330 |
How ZIP+4 works in 57042
The four digits after the hyphen encode a delivery segment inside 57042. 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 57042 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 57042.
| ZIP | City | Distance |
|---|---|---|
| 57075 | Wentworth, SD | 9.2 mi |
| 57076 | Winfred, SD | 10 mi |
| 57016 | Chester, SD | 11.2 mi |
| 57054 | Ramona, SD | 11.3 mi |
| 57057 | Rutland, SD | 12.9 mi |
| 57050 | Nunda, SD | 14.1 mi |
| 57018 | Colton, SD | 14.9 mi |
| 57017 | Colman, SD | 16.4 mi |
| 57048 | Montrose, SD | 16.5 mi |
| 57061 | Sinai, SD | 19.2 mi |
| 57051 | Oldham, SD | 19.3 mi |
| 57058 | Salem, SD | 20.3 mi |
Questions about 57042
What is the ZIP+4 code for 57042?
57042 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 57042, you need to look up a specific street address to get them.
What city is 57042?
57042 is assigned to Madison, South Dakota, in Lake 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.