IACAC is organized into two Regions, each of which is comprised of four Districts.
Central/Southern Illinois District Breakdown by County:
- Champaign, Clark, Coles, Cumberland, DeWitt, Douglas, Edgar, Effingham, Fayette, Ford, lriquois, Macon, Moultrie, Piatt, Shelby, Vermillion
- Bureau, La Salle, Livingston, Marshall, McLean, Peoria, Putnam, Tazewell, Woodford
- Grundy, Kankakee, Kendall, Will
- Alexander, Clay, Crawford, Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson, Jasper, Jefferson, Johnson, Lawrence, Marion, Massac, Perry, Pope, Pulaski, Richland, Saline, Union, Wabash, Wayne, White, Williamson
- Bond, Calhoun, Cass, Christian, Clinton, Greene, Jersey, Logan, Macoupin, Madison, Mason, Menard, Monroe, Montgomery, Morgan, Randolph, Sangamon, Scott, St. Clair, Washington
- Adams, Brown, Fulton, Hancock, Henry, Knox, McDonough, Mercer, Pike, Rock Island, Schuyler, Stark, Warren