Counties 102

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• Lawrence County pop. 15,152
• Lee County pop. 34,049
• Livingston County pop. 35,664
• Logan County pop. 27,992
• Macon County pop. 102,432
• Macoupin County pop. 44,406
• Madison County pop. 264,490
• Marion County pop. 37,390
• Marshall County pop. 11,663
• Mason County pop. 12,881
• Massac County pop. 13,960
• Mcdonough County pop. 26,828
• Mchenry County pop. 311,122
• Mclean County pop. 170,889
• Menard County pop. 12,164
• Mercer County pop. 15,582
• Monroe County pop. 34,932
• Montgomery County pop. 28,084
• Morgan County pop. 32,606
• Moultrie County pop. 14,510
• Ogle County pop. 51,449
• Peoria County pop. 179,432
• Perry County pop. 20,985
• Piatt County pop. 16,753
• Pike County pop. 14,618
• Pope County pop. 3,779
• Pulaski County pop. 5,065
• Putnam County pop. 5,566
• Randolph County pop. 30,142
• Richland County pop. 15,796
• Rock Island County pop. 142,909
• Saline County pop. 23,320
• Sangamon County pop. 194,734
• Schuyler County pop. 6,843
• Scott County pop. 4,836
• Shelby County pop. 20,789
• St Clair County pop. 254,796
• Stark County pop. 5,294
• Stephenson County pop. 44,021
• Tazewell County pop. 130,413
• Union County pop. 16,923
• Vermilion County pop. 73,095
• Wabash County pop. 11,202
• Warren County pop. 16,531
• Washington County pop. 13,655
• Wayne County pop. 15,963
• White County pop. 13,784
• Whiteside County pop. 55,305
• Will County pop. 697,252
• Williamson County pop. 66,879

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 Osceola pop. 878
• Township of Osco pop. 423
• Township of Oskaloosa pop. 338
• Township of Oswego pop. 56,851
• Township of Otego pop. 1,489
• Township of Ottawa pop. 11,185
• Township of Otter Creek pop. 2,659
• Township of Otter Creek pop. 868
• Township of Otto pop. 2,108
• Township of Owego pop. 301
• Township of Owen pop. 3,599
• Township of Oxford pop. 1,149
• Township of Palatine pop. 111,886
• Township of Palestine pop. 1,133
• Township of Palmyra pop. 2,870
• Township of Palos pop. 55,667
• Township of Pana pop. 6,119
• Township of Panola pop. 375
• Township of Panther Creek pop. 295
• Township of Papineau pop. 436
• Township of Paradise pop. 972
• Township of Paris pop. 9,037
• Township of Parker pop. 161
• Township of Partridge pop. 578
• Township of Patoka pop. 932
• Township of Patterson pop. 395
• Township of Patton pop. 5,242
• Township of Paw Paw pop. 312
• Township of Pawnee pop. 3,000
• Township of Payson pop. 1,722
• Township of Pea Ridge pop. 189
• Township of Peach Orchard pop. 554
• Township of Pearl pop. 196
• Township of Pecatonica pop. 4,109
• Township of Pekin pop. 27,299
• Township of Pella pop. 157
• Township of Pembroke pop. 1,785
• Township of Pendleton pop. 1,141
• Township of Penn pop. 310
• Township of Penn pop. 87
• Township of Pennsylvania pop. 154
• Township of Peoria City pop. 96,531
• Township of Peotone pop. 4,382
• Township of Perry pop. 481
• Township of Perryton pop. 453
• Township of Persifer pop. 1,068
• Township of Peru pop. 10,085
• Township of Pesotum pop. 868
• Township of Petty pop. 621
• Township of Phenix pop. 1,681