Wisconsin has eight congressional voting districts, and the smallest of these by land size is the 4th District, which encompasses parts of Milwaukee County and the city proper. The 7th District, which is the largest, covers most of the northern part of the state and eight counties, including Ashland, Bayfield, Douglas, Sawyer and Marathon Counties.
Residents of Green Bay and its surrounding counties of Door, Marinette, Onconto, Brown and Kewaunee vote in the 8th District. The 1st District covers the southeastern portion of the state, including Racine, Kenosha and Walworth Counties. The 3rd District consists of La Crosse and the counties of Grant, Portage, Buffalo, Eau Claire and Dunn. The state capital, Madison, sits in the 2nd District along with Dane County, Sauk County and Iowa County. The 5th District consists of Jefferson County and Washington County, both just west of Milwaukee. Finally, the 6th District sits just south of Green Bay and covers counties such as Manitowoc, Sheboygan, Ozaukee. Marquette and Fon du Lac.
Wisconsin redistricts its voting areas approximately every decade, including in 1973, 1982, 1993, 2003 and 2013. Until 2003, Wisconsin had nine congressional voting districts. That year, the state consolidated into the eight current districts. Only minor changes to district boundaries have occurred since then.