Wisconsin doesn't have an official state nickname.
Spoiler alert: if you haven't yet revealed the License Plate Nickname for Wisconsin, you may prefer not to read the following paragraph.
According to the Reader's Digest: "Although Wisconsin has long been known as 'The Badger State' (after the animal), a Senate bill to make the name official failed to pass in 1996. Perhaps this is because there are many who think of Wisconsin as 'America's Dairyland', the name that the Wisconsin Dairy Farmers prefer."
© Haydn Thompson 2021