Geographical Area, S/Illinois

U.S. Marshals Service offices are based on the organizational structure of the Federal District Court system. Illinois is divided into three judicial districts to be known as the Northern, Central, and Southern Districts of Illinois.
	Southern District of Illinois The Southern District comprises the counties of Alexander, Bond, Calhoun, Clark, Clay, Clinton, Crawford, Cumberland, Edwards, Effingham, Fayette, Franklin, Gallatin, Hamilton, Hardin, Jackson, Jasper, Jefferson, Jersey, Johnson, Lawrence, Madison, Marion, Massac, Monroe, Perry, Pope, Pulaski, Randolph, Richland, St. Clair, Saline, Union, Wabash, Washington, Wayne, White, and Williamson. Court for the Southern District shall be held at Alton, Benton, Cairo, and East Saint Louis.
For Marshals Service office contacts in other counties:
	Northern District of Illinois The Northern District comprises two divisions. The Eastern Division comprises the counties of Cook, Du Page, Grundy, Kane, Kendall, Lake, La Salle, and Will. Court for the Eastern Division shall be held at Chicago and Wheaton. The Western Division comprises the counties of Boone, Carroll, De Kalb, Jo Daviess, Lee, McHenry, Ogle, Stephenson, Whiteside, and Winnebago. Court for the Western Division shall be held at Freeport and Rockford.
	Central District of Illinois The Central District comprises the counties of Adams, Brown, Bureau, Cass, Champaign, Christian, Coles, De Witt, Douglas, Edgar, Ford, Fulton, Greene, Hancock, Henderson, Henry, Iroquois, Kankakee, Knox, Livingston, Logan, McDonough, McLean, Macoupin, Macon, Marshall, Mason, Menard, Mercer, Montgomery, Morgan, Moultrie, Peoria, Piatt, Pike, Putnam, Rock Island, Sangamon, Schuyler, Scott, Shelby, Stark, Tazewell, Vermilion, Warren, and Woodford. Court for the Central District shall be held at Champaign/Urbana, Danville, Peoria, Quincy, Rock Island, and Springfield.
The organizational structure of the district can be found in the United States Code Title 28, Part I, Chapter 5, Section 93.