Oak Park Elementary School District 97 Berwyn North School District 98 Cicero School District 99 South Berwyn School District 100 Western Springs School District 101 LaGrange Elementary School District 102 Lyons School District 103 LaGrange School District 105 South LaGrange Highlands School District 106 Pleasantdale School District 107 Oak Park and River Forest High School District 200 J. Sterling Morton High School District 201 Lyons Township High School District 204 Riverside-Brookfield Township District 208 Proviso Township High Schools District 209 Leyden Community High School District 212 Ridgewood Community High School District 234 Elmwood Park Community Unit School District 401 Region 07: South Cook ISC 4 Cook County Cook County School District 104 — based in Summit Willow Springs School District 108 Indian Springs School District 109 Central Stickney School District 110 Burbank School District 111 Lemont-Bromberek Combined School District 113A North Palos School District 117 Palos School District 118 Ridgeland School District 122 Oak Lawn-Hometown School District 123 Evergreen Park Elementary School District 124 Atwood Heights School District 125 Alsip-Hazelgreen-Oak Lawn School District 126 Worth School District 127 Chicago Ridge School District 127½ Palos Heights School District 128 Cook County School District 130 — based in Blue Island Calumet Public School District 132 General George Patton School District 133 Orland School District 135 Kirby School District 140 Forest Ridge School District 142 Midlothian School District 143 Posen-Robbins School District 143½ Prairie-Hills Elementary School District 144 Arbor Park School District 145 Tinley Park Community Consolidated School District 146 West Harvey-Dixmoor Public School District 147 Dolton Riverdale School District 148 Dolton School District 149 South Holland School District 150 South Holland School District 151 Harvey School District 152 Hazel Crest School District 152½ Homewood School District 153 Thornton School District 154 Burnham School District 154½ Calumet City School District 155 Lincoln Elementary School District 156 Hoover-Schrum Memorial School District 157 Lansing School District 158 Elementary School District 159 — based in Matteson, but not District 162 Country Club Hills School District 160 Flossmoor School District 161 Matteson School District 162 — not to be confused with District 159, also based in Matteson Park Forest School District 163 Brookwood School District 167 Community Consolidated School District 168 — based in Sauk Village Ford Heights School District 169 Chicago Heights School District 170 Sunnybrook School District 171 Sandridge School District 172 Steger School District 194 Thornton Township High School District 205 Bloom Township High