Counties in Illinois:
Adams, Alexander, Bond, Boone, Brown, Bureau, Calhoun, Carroll, Cass, Champaign, Christian, Clark, Clay, Clinton, Coles, Cook, Crawford, Cumberland, DeKalb, DeWitt, Douglas, DuPage, Edgar, Edwards, Effingham, Fayette, Ford, Franklin, Fulton, Gallatin, Greene, Grundy, Hamilton, Hancock, Hardin, Harris, Henderson, Henry, Iroquois, Jackson, Jasper, Jefferson, Jersey, Jo Daviess, Johnson, Kane, Kankakee, Kendall, Knox, LaSalle, Lake, Lawrence, Lee, Livingston, Logan, McDonough, McHenry, McLean, Macon, Madison, Marion, Marshall, Mason, Massac, Menard, Monroe, Montgomery, Morgan, Moultrie, Ogle, Peoria, Perry, Piatt, Pike, Pope, Pulaski, Randolph, Richland, Rock Island, St. Clair, Saline, Sangamon, Schuyler, Scott, Shelby, Stark, Stephenson, Tazewell, Union, Vermilion, Wabash, Warren, Washington, Wayne, White, Whitley, Will, Winnebago, and Woodford.
Largest Cities in Illinois:
Chicago, Aurora, Joliet, Naperville, Rockford, Elgin, Springfield, Peoria, Champaign, Waukegan, Cicero, Bloomington, Schaumburg, Evanston, Arlington Heights, Bolingbrook, Decatur, Skokie, Palatine, Skokie, Des Plaines, Orland Park, Oak Lawn, Berwyn, Mount Prospect, Tinley Park, Oak Park, Wheaton, Downers Grove, Glenview, Glen Ellyn, Elmhurst, Carol Stream, Streamwood, Bartlett, Hoffman Estates, Lombard, Moline, Quincy, DeKalb, Normal, Belleville, Urbana, Decatur, Alton, Alton, Carbondale, Rock Island, East St. Louis, and more.