ZIP Code 54840 — Grantsburg, WI
54840 is a standard (street delivery) ZIP code serving Grantsburg, Wisconsin, in Burnett 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 54840 at a glance
| ZIP code | 54840 |
|---|---|
| Primary city | Grantsburg |
| State | Wisconsin (WI) |
| County | Burnett FIPS 55013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 4,775 |
| Coordinates | 45.755600, -92.689280 |
How ZIP+4 works in 54840
The four digits after the hyphen encode a delivery segment inside 54840. 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 54840 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 54840.
| ZIP | City | Distance |
|---|---|---|
| 54006 | Cushing, WI | 11.6 mi |
| 55063 | Pine City, MN | 11.7 mi |
| 55069 | Rush City, MN | 14.1 mi |
| 54872 | Siren, WI | 14.1 mi |
| 54837 | Frederic, WI | 16.9 mi |
| 54853 | Luck, WI | 17.1 mi |
| 54024 | Saint Croix Falls, WI | 17.8 mi |
| 55037 | Hinckley, MN | 18.2 mi |
| 55032 | Harris, MN | 18.6 mi |
| 54858 | Milltown, WI | 19.7 mi |
| 54893 | Webster, WI | 20 mi |
| 55084 | Taylors Falls, MN | 20.4 mi |
Questions about 54840
What is the ZIP+4 code for 54840?
54840 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 54840, you need to look up a specific street address to get them.
What city is 54840?
54840 is assigned to Grantsburg, Wisconsin, in Burnett 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.