The State of Wisconsin requires a Photo ID to vote. You will need to show an original copy of an acceptable photo ID to vote at your polling place or to cast an in-person absentee ballot at your municipal clerk's office. You will also be required to provide a photocopy of your ID to cast an absentee ballot by mail, with certain exceptions for military and permanent overseas voters and permanent absentee voters. For further questions, visit bringit.wi.gov.

There are exceptions to the Photo ID law:

• If you’re in the military, live permanently overseas or are classified as a confidential elector, you don’t need a photo ID to cast your absentee ballot.
• There are also accommodations in the law for absentee voters who cannot make it to a polling place because they are indefinitely confined, or live in a nursing home or care facility. These voters do not need to show their photo ID, but other rules do apply.

[Source: bringit.wi.gov]