MABAS Divisions with Cook County Members (see individual communities and dispatch centers for dispatch freqs):

Division 1: Arlington Heights FD, Des Plaines FD, Elk Grove Township FD, Elk Grove Village FD, Hoffman Estates FD, Mount Prospect FD, Palatine FD, Inverness FPD, Rolling Meadows FD, Rosemont FD, Schaumburg FD, Wheeling FD

Division 2: Streamwood FD

Division 3: Evanston FD, Glencoe FD, Glenview FD, Lincolnwood FD, Morton Grove FD, Niles FD, Northbrook FD, Northfield FD, North Maine FPD, Park Ridge FD, Prospect Heights FD, Skokie FD, Wilmette FD, Winnetka FD

Division 4: Barrrington FD, Buffalo Grove FD

Division 9: Chicago FD

Division 10: Brookfield FD, Forest View FD, LaGrange FD, LaGrange Park FD, Lyons FD, McCook FD, Pleasantview FPD, Riverside FD, Tri-State FPD, Western Springs FD, 

Division 11: Berwyn FD, Cicero FD, Forest Park FD, North Riverside FD, Oak Park FD, River Forest FD, Stickney FD

Division 19: Palos FPD, Palos Heights FPD

Division 20: Bellwood FD, Berkley FD, Broadview FD, Elmwood Park FD, Franklin Park FD, Hillside FD, Leyden FPD, Maywood FD, Melrose Park FD, Northlake FD, Norwood Park FPD, River Grove FD, Rosemont FD, Schiller Park FD, Westchester FD

Division 21: Bedford Park FD, Bridgeview FD, Burbank FD, Central Stickney FPD, Chicago Ridge FD, Evergreen Park FD, Hometown FD, North Palos FPD, Oak Lawn FD, Roberts Park FPD, Summit FD 

Division 22: Alsip FD (2000s), Blue Island FD (2100s), Calumet Park FD (2200s), Crestwood FD (2300s), Garden Homes FPD (2500s), Merrionette Park FD (2600s), Midlothian FD (2700s), Posen FD (2800s), Robbins FD (2900s)

Division 24:  Burnham FD, Calument City FD, Country Club Hills FD, Dolton FD, East Hazelcrest FD, Flossmoor FD, Glenwood FD, Harvey FD, Hazel Crest FD, Homewood FD, Homewood Acres FD, Lansing FD, Lynwood FD, Markham FD, Munster (IN) FD, Oak Forest FD, Phoenix FD, Riverdale FD, South Holland FD, Thornton FD, Tinley Park FD

Division 27: Chicago Heights FD, Ford Heights FD, Matteson FD, Park Forest FD, Richton Park FD, Sauk Village FD, South Chicago Heights FD, Steger FD, Steger Estates FD, University Park FD