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Strata Map
Jo Daviess Stephenson Winnebago Boone McHenry Lake Carroll Ogle DeKalb Kane DuPage Suburban Cook County Suburban Cook County Chicago Will Kankakee Iroquois Grundy Kendall Whiteside Lee Rock Island Henry Bureau Putnam LaSalle Mercer Henderson Warren Knox Stark Marshall Livingston Ford Peoria Woodford Tazewell McLean Fulton McDonough Hancock Adams Pike Brown Schuyler Mason Logan Menard Cass Morgan Scott Sangamon DeWitt Macon Piatt Champaign Vermilion Douglas Edgar Coles Clark Cumberland Moultrie Shelby Christian Montgomery Macoupin Greene Calhoun Jersey Madison Bond Fayette Effingham Jasper Crawford Lawrence Wabash Edwards Richland Clay Marion Wayne Jefferson Clinton St. Clair Washington Monroe Randolph Perry Franklin Hamilton Saline White Gallatin Hardin Pope Massac Johnson Williamson Jackson Union Alexander Pulaski
Chicago Illinois residents that reside within the boundaries of Chicago and excludes all other Illinois residents.
Cook County Illinois residents that reside within the boundaries of Cook County but not within the City of Chicago and excludes all other Illinois residents.
Collar Counties Illinois residents that reside within the five counties that surround and are contiguous with Cook County. The five collar counties are DuPage, Kane, Lake, McHenry, and Will.
Urban Counties Urban counties include residents of counties outside the immediate Chicago metropolitan area. Urban counties contain their own large city and include Champaign, DeKalb, Kankakee, Kendall, McLean, Macon, Madison, Peoria, Rock Island, Sangamon, St. Clair, Tazewell, and Winnebago counties.
Rural
Counties		 Rural counties include residents of counties outside the immediate Chicago metropolitan area. Rural counties do not contain a large city and include Adams, *Alexander, Bond, Boone, Brown, Bureau, Calhoun, Carrol, Cass, Christian, Clark, Clay, Clinton, Coles, Crawford, Cumberland, DeWitt, Douglas, Edgar, Edwards, Effingham, Fayette, Ford, Franklin, Fulton, **Gallatin, Greene, Grundy, Hamilton, Hancock, *Hardin, Henderson, Henry, Iroquois, Jackson, Jasper, Jefferson, Jersey, JoDaviess, *Johnson, Knox, LaSalle, Lawrence, Lee, Livingston, Logan, McDonough, Macoupin, Marion, Marshall, Mason, *Massac, Menard, Mercer, Monroe, Montgomery, Morgan, Moultrie, Ogle, Perry, Piatt, Pike, *Pope, *Pulaski, Putnam, Randolph, Richland, **Saline, Schuyler, Scott, Shelby, Stark, Stephenson, *Union, Vermillion, Wabash, Warren, Washington, Wayne, **White, Whiteside, Williamson, and Woodford counties.
  * Southern Seven Health Department
** Egyptian Health Department