20 ILCS 105/3.08
"Planning and Service Area" means a geographic area of the State that is designated by the Department for the purposes of planning, development, delivery, and overall administration of services under the area plan. Within each planning and service area the Department must designate an area agency on aging. For the purposes of this Section such planning and service areas shall be as follows:
Area 1, which is comprised of the counties of Jo Daviess, Stephenson, Winnebago, Boone, Carroll, Ogle, DeKalb, Whiteside and Lee;
Area 2, which is comprised of the counties of McHenry, Lake, Kane, DuPage, Kendall, Will, Grundy and Kankakee;
Area 3, which is comprised of the counties of Rock Island, Mercer, Henry, Bureau, LaSalle, Putnam, Henderson, Warren, Knox and McDonough;
Area 4, which is comprised of the counties of Stark, Marshall, Peoria, Woodford, Fulton and Tazewell;
Area 5, which is comprised of the counties of Livingston, Iroquois, McLean, Ford, DeWitt, Piatt, Champaign, Vermilion, Macon, Moultrie, Douglas, Edgar, Shelby, Coles, Clark and Cumberland;
Area 6, which is comprised of the counties of Hancock, Schuyler, Adams, Brown, Pike and Calhoun;
Area 7, which is comprised of the counties of Mason, Logan, Cass, Menard, Scott, Morgan, Sangamon, Christian, Greene, Macoupin, Montgomery and Jersey;
Area 8, which is comprised of the counties of Madison, Bond, St. Clair, Clinton, Monroe, Washington and Randolph;
Area 9, which is comprised of the counties of Fayette, Effingham, Marion, Clay and Jefferson;
Area 10, which is comprised of the counties of Jasper, Crawford, Richland, Lawrence, Wayne, Edwards, Wabash, Hamilton and White;
Area 11, which is comprised of the counties of Perry, Franklin, Jackson, Williamson, Saline, Gallatin, Union, Johnson, Pope, Hardin, Alexander, Pulaski and Massac;
Area 12, which is comprised of the City of Chicago in Cook County; and
Area 13, which is comprised of the County of Cook outside the City of Chicago.
At the discretion of the Department and the county, a county of 500,000 population or more may form its own area agency.
20 ILCS 105/3.08