Wisconsin

U.S. Marshals Service offices are based on the organizational structure of the Federal District Court system. Wisconsin is divided into two judicial districts that are referred to as the Eastern and Western districts of Wisconsin.

	Eastern District of Wisconsin: The Eastern District comprises the counties of Brown, Calumet, Dodge, Door, Florence, Fond du Lac, Forest, Green Lake, Kenosha, Kewaunee, Langlade, Manitowoc, Marinette, Marquette, Menominee, Milwaukee, Oconto, Outagamie, Ozaukee, Racine, Shawano, Sheboygan, Walworth, Washington, Waukesha, Waupaca, Waushara, and Winnebago. Court for the Eastern District is held in Green Bay, Milwaukee, and Oshkosh.

	Western District of Wisconsin: The Western District comprises the counties of Adams, Ashland, Barron, Bayfield, Buffalo, Burnett, Chippewa, Clark, Columbia, Crawford, Dane, Douglas, Dunn, Eau Claire, Grant, Green, Iowa, Iron, Jackson, Jefferson, Juneau, La Crosse, Lafayette, Lincoln, Marathon, Monroe, Oneida, Pepin, Pierce, Polk, Portage, Price, Richland, Rock, Rusk, Saint Croix, Sauk, Sawyer, Taylor, Trempealeau, Vernon, Vilas, Washburn, and Wood. Court for the Western District is held in Eau Claire, La Crosse, Madison, Superior, and Wausau.
The organizational structure of the district can be found in the United States Code Title 28, Part I, Chapter 5, Section 130.