For the purpose of the use of the Illinois Coordinate System, the State is divided into an “East Zone” and a “West Zone”.
     The area now included in the following counties constitutes the “East Zone”: Boone, Champaign, Clark, Clay, Coles, Cook, Crawford, Cumberland, DeKalb, DeWitt, Douglas, DuPage, Edgar, Edwards, Effingham, Fayette, Ford, Franklin, Gallatin, Grundy, Hamilton, Hardin, Iroquois, Jasper, Jefferson, Johnson, Kane, Kankakee, Kendall, Lake, LaSalle, Lawrence, Livingston, McHenry, McLean, Macon, Marion, Massac, Moultrie, Piatt, Pope, Richland, Saline, Shelby, Vermilion, Wabash, Wayne, White, Will and Williamson.

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Terms Used In Illinois Compiled Statutes 765 ILCS 225/3

  • State: when applied to different parts of the United States, may be construed to include the District of Columbia and the several territories, and the words "United States" may be construed to include the said district and territories. See Illinois Compiled Statutes 5 ILCS 70/1.14

     The area now included in the following counties constitutes the “West Zone”: Adams, Alexander, Bond, Brown, Bureau, Calhoun, Carroll, Cass, Christian, Clinton, Fulton, Greene, Hancock, Henderson, Henry, Jackson, Jersey, Jo Daviess, Knox, Lee, Logan, McDonough, Macoupin, Madison, Marshall, Mason, Menard, Mercer, Monroe, Montgomery, Morgan, Ogle, Peoria, Perry, Pike, Pulaski, Putnam, Randolph, Rock Island, St. Clair, Sangamon, Schuyler, Scott, Stark, Stephenson, Tazewell, Union, Warren, Washington, Whiteside, Winnebago and Woodford.