Counties 102

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• Adams County pop. 64,954
• Alexander County pop. 5,030
• Bond County pop. 16,596
• Boone County pop. 53,159
• Brown County pop. 6,421
• Bureau County pop. 32,883
• Calhoun County pop. 4,369
• Carroll County pop. 15,698
• Cass County pop. 12,773
• Champaign County pop. 205,943
• Christian County pop. 33,662
• Clark County pop. 15,300
• Clay County pop. 13,143
• Clinton County pop. 36,793
• Coles County pop. 46,765
• Cook County pop. 5,173,146
• Crawford County pop. 18,659
• Cumberland County pop. 10,345
• De Witt County pop. 15,341
• Dekalb County pop. 100,414
• Douglas County pop. 19,722
• Dupage County pop. 924,885
• Edgar County pop. 16,520
• Edwards County pop. 6,075
• Effingham County pop. 34,430
• Fayette County pop. 21,384
• Ford County pop. 13,511
• Franklin County pop. 37,442
• Fulton County pop. 33,197
• Gallatin County pop. 4,903
• Greene County pop. 11,843
• Grundy County pop. 52,989
• Hamilton County pop. 7,911
• Hancock County pop. 17,400
• Hardin County pop. 3,650
• Henderson County pop. 6,312
• Henry County pop. 48,907
• Iroquois County pop. 26,827
• Jackson County pop. 52,565
• Jasper County pop. 9,193
• Jefferson County pop. 36,877
• Jersey County pop. 21,333
• Jo Daviess County pop. 21,939
• Johnson County pop. 13,463
• Kane County pop. 515,588
• Kankakee County pop. 106,601
• Kendall County pop. 134,867
• Knox County pop. 49,268
• Lake County pop. 711,239
• Lasalle County pop. 108,965

Municipalities 1,294

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• City of North Chicago pop. 30,029
• City of Northlake pop. 12,664
• City of O Fallon pop. 32,292
• City of Oak Forest pop. 26,793
• City of Oakbrook Terrace pop. 2,725
• City of Oakland pop. 732
• City of Oglesby pop. 3,660
• City of Olney pop. 8,692
• City of Oneida pop. 684
• City of Oregon pop. 3,592
• City of Orient pop. 323
• City of Ottawa pop. 18,749
• City of Palos Heights pop. 11,819
• City of Palos Hills pop. 18,117
• City of Pana pop. 5,262
• City of Paris pop. 8,140
• City of Park City pop. 7,867
• City of Park Ridge pop. 38,810
• City of Paxton pop. 4,459
• City of Pekin pop. 31,448
• City of Peoria pop. 111,666
• City of Peru pop. 9,842
• City of Petersburg pop. 2,231
• City of Pinckneyville pop. 5,198
• City of Pittsfield pop. 4,193
• City of Plano pop. 12,191
• City of Polo pop. 2,262
• City of Pontiac pop. 11,359
• City of Princeton pop. 7,716
• City of Prophetstown pop. 1,929
• City of Prospect Heights pop. 15,691
• City of Quincy pop. 39,131
• City of Red Bud pop. 3,684
• City of Robinson pop. 7,187
• City of Rochelle pop. 9,367
• City of Rock Falls pop. 8,724
• City of Rock Island pop. 36,636
• City of Rockford pop. 147,711
• City of Rolling Meadows pop. 23,781
• City of Roodhouse pop. 1,545
• City of Rosiclare pop. 966
• City of Rushville pop. 3,026
• City of Salem pop. 7,187
• City of Sandwich pop. 7,178
• City of Savanna pop. 2,909
• City of Sesser pop. 1,865
• City of Shawneetown pop. 1,054
• City of Shelbyville pop. 4,609
• City of Silvis pop. 7,952
• City of South Beloit pop. 7,932

Townships 1,425

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• Township of North Muddy pop. 772
• Township of North Okaw pop. 992
• Township of North Otter pop. 764
• Township of North Palmyra pop. 809
• Township of Northeast pop. 833
• Township of Northern pop. 445
• Township of Northfield pop. 89,863
• Township of Northville pop. 7,297
• Township of Norton pop. 914
• Township of Norwood Park pop. 26,878
• Township of Nunda pop. 38,401
• Township of O Fallon pop. 26,336
• Township of Oak Park pop. 53,224
• Township of Oakdale pop. 546
• Township of Oakland pop. 133
• Township of Oakley pop. 952
• Township of Oakwood pop. 3,125
• Township of Oblong pop. 2,757
• Township of Oconee pop. 781
• Township of Odell pop. 1,183
• Township of Odin pop. 1,564
• Township of Ogden pop. 1,516
• Township of Ohio pop. 816
• Township of Ohio Grove pop. 271
• Township of Okaw pop. 886
• Township of Okawville pop. 1,945
• Township of Old Ripley pop. 859
• Township of Old Town pop. 3,387
• Township of Olio pop. 4,683
• Township of Olive pop. 1,705
• Township of Olney pop. 9,972
• Township of Omaha pop. 423
• Township of Omega pop. 445
• Township of Omphghent pop. 2,448
• Township of Onarga pop. 1,599
• Township of Oneco pop. 1,268
• Township of Ontario pop. 901
• Township of Ophir pop. 437
• Township of Oquawka pop. 1,650
• Township of Ora pop. 506
• Township of Oran pop. 305
• Township of Orange pop. 255
• Township of Orange pop. 521
• Township of Orchard pop. 627
• Township of Oregon-Nashua pop. 4,776
• Township of Orel pop. 1,342
• Township of Orion pop. 1,114
• Township of Orland pop. 96,470
• Township of Orvil pop. 959
• Township of Osage pop. 242