ZIP Code 53820 — Potosi, WI
53820 is a standard (street delivery) ZIP code serving Potosi, Wisconsin, in Grant 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 53820 at a glance
| ZIP code | 53820 |
|---|---|
| Primary city | Potosi |
| State | Wisconsin (WI) |
| County | Grant FIPS 55043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,467 |
| Coordinates | 42.696490, -90.709840 |
How ZIP+4 works in 53820
The four digits after the hyphen encode a delivery segment inside 53820. 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 53820 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 53820.
| ZIP | City | Distance |
|---|---|---|
| 53808 | Dickeyville, WI | 7.2 mi |
| 52073 | Sherrill, IA | 7.6 mi |
| 53812 | Kieler, WI | 9.7 mi |
| 53813 | Lancaster, WI | 10.2 mi |
| 52001 | Dubuque, IA | 10.3 mi |
| 53806 | Cassville, WI | 11.3 mi |
| 53818 | Platteville, WI | 11.6 mi |
| 53802 | Beetown, WI | 12 mi |
| 52002 | Dubuque, IA | 12.3 mi |
| 52039 | Durango, IA | 13.2 mi |
| 52066 | North Buena Vista, IA | 13.2 mi |
| 53807 | Cuba City, WI | 13.7 mi |
Questions about 53820
What is the ZIP+4 code for 53820?
53820 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 53820, you need to look up a specific street address to get them.
What city is 53820?
53820 is assigned to Potosi, Wisconsin, in Grant 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.