It contains the cities of Antigo, Eagle River, Marinette, Merrill, Peshtigo, Rhinelander, and Tomahawk.

[2] Mary Felzkowski is the senator representing the 12th district.

The portion of the district in Florence, Forest, Langlade, Oneida, Vilas, Lincoln, and Marathon counties falls within the Wisconsin's 7th congressional district, which is represented by U.S. Representative Tom Tiffany; the remainder of the district, which falls within Marinette, Oconto, Menominee, and Shawano counties, is in Wisconsin's 8th congressional district, which is represented by U.S. Representative Mike Gallagher.

[5] Past senators include:[6] Note: the boundaries of the district has changed repeatedly over history.

Previous politicians of this district have represented a completely different geographic area, due to redistricting.