ZIP Code 53121 — Elkhorn, WI
53121 is a standard (street delivery) ZIP code serving Elkhorn, Wisconsin, in Walworth 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 53121 at a glance
| ZIP code | 53121 |
|---|---|
| Primary city | Elkhorn |
| State | Wisconsin (WI) |
| County | Walworth FIPS 55127 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 18,551 |
| Coordinates | 42.709890, -88.530280 |
How ZIP+4 works in 53121
The four digits after the hyphen encode a delivery segment inside 53121. 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 53121 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 53121.
| ZIP | City | Distance |
|---|---|---|
| 53176 | Springfield, WI | 7.5 mi |
| 53115 | Delavan, WI | 8.1 mi |
| 53120 | East Troy, WI | 8.5 mi |
| 53191 | Williams Bay, WI | 9.2 mi |
| 53147 | Lake Geneva, WI | 10.4 mi |
| 53125 | Fontana, WI | 11.5 mi |
| 53190 | Whitewater, WI | 12.2 mi |
| 53119 | Eagle, WI | 12.2 mi |
| 53156 | Palmyra, WI | 12.8 mi |
| 53184 | Walworth, WI | 13 mi |
| 53105 | Burlington, WI | 13.1 mi |
| 53114 | Darien, WI | 13.2 mi |
Questions about 53121
What is the ZIP+4 code for 53121?
53121 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 53121, you need to look up a specific street address to get them.
What city is 53121?
53121 is assigned to Elkhorn, Wisconsin, in Walworth 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.