Polk County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 44,977. Its county seat is Balsam Lake. The county was created in 1853 and named for United States President James K. Polk.

Wisconsin's 7th congressional district is a congressional district of the United States House of Representatives in northwestern and central Wisconsin; it is the largest congressional district in the state geographically, covering 20 counties, for a total of 18,787 sq mi. The district contains the following counties: Ashland, Barron, Bayfield, Burnett, St. Croix, Chippewa (partial), Clark, Douglas, Florence, Forest, Iron, Jackson (partial), Juneau (partial), Langlade, Lincoln, Marathon, Monroe (partial), Oneida, Polk, Price, Rusk, Sawyer, Taylor, Vilas, Washburn, and Wood (partial).