Map of Illinois
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How many counties are in Illinois?
Illinois has 102 counties. The list below includes each county, its FIPS code, and population.
Illinois county table
County list for Illinois with county FIPS codes and population totals.
| County | State | County FIPS | Population |
|---|---|---|---|
| Cook County | IL | 17031 | 5,087,072 |
| DuPage County | IL | 17043 | 921,213 |
| Lake County | IL | 17097 | 708,760 |
| Will County | IL | 17197 | 700,728 |
| Kane County | IL | 17089 | 514,982 |
| McHenry County | IL | 17111 | 312,800 |
| Winnebago County | IL | 17201 | 280,922 |
| Madison County | IL | 17119 | 262,752 |
| St. Clair County | IL | 17163 | 251,018 |
| Champaign County | IL | 17019 | 205,644 |
| Sangamon County | IL | 17167 | 193,491 |
| Peoria County | IL | 17143 | 177,513 |
| McLean County | IL | 17113 | 170,441 |
| Rock Island County | IL | 17161 | 141,236 |
| Kendall County | IL | 17093 | 139,976 |
| Tazewell County | IL | 17179 | 129,541 |
| LaSalle County | IL | 17099 | 108,309 |
| Kankakee County | IL | 17091 | 105,940 |
| Macon County | IL | 17115 | 100,591 |
| DeKalb County | IL | 17037 | 100,288 |
| Vermilion County | IL | 17183 | 71,652 |
| Williamson County | IL | 17199 | 66,706 |
| Adams County | IL | 17001 | 64,441 |
| Whiteside County | IL | 17195 | 54,498 |
| Grundy County | IL | 17063 | 53,578 |
| Boone County | IL | 17007 | 53,202 |
| Jackson County | IL | 17077 | 52,141 |
| Ogle County | IL | 17141 | 51,265 |
| Henry County | IL | 17073 | 48,448 |
| Knox County | IL | 17095 | 48,411 |
| Coles County | IL | 17029 | 46,060 |
| Macoupin County | IL | 17117 | 44,018 |
| Stephenson County | IL | 17177 | 43,105 |
| Woodford County | IL | 17203 | 38,285 |
| Franklin County | IL | 17055 | 37,138 |
| Clinton County | IL | 17027 | 36,785 |
| Marion County | IL | 17121 | 36,673 |
| Jefferson County | IL | 17081 | 36,320 |
| Livingston County | IL | 17105 | 35,320 |
| Monroe County | IL | 17133 | 34,957 |
| Effingham County | IL | 17049 | 34,331 |
| Lee County | IL | 17103 | 33,654 |
| Christian County | IL | 17021 | 33,228 |
| Bureau County | IL | 17011 | 32,729 |
| Fulton County | IL | 17057 | 32,541 |
| Morgan County | IL | 17137 | 32,140 |
| Randolph County | IL | 17157 | 29,815 |
| Montgomery County | IL | 17135 | 27,663 |
| Logan County | IL | 17107 | 27,590 |
| McDonough County | IL | 17109 | 26,839 |
| Iroquois County | IL | 17075 | 26,136 |
| Saline County | IL | 17165 | 22,873 |
| Jo Daviess County | IL | 17085 | 21,756 |
| Fayette County | IL | 17051 | 21,164 |
| Jersey County | IL | 17083 | 21,091 |
| Shelby County | IL | 17173 | 20,568 |
| Perry County | IL | 17145 | 20,503 |
| Douglas County | IL | 17041 | 19,629 |
| Crawford County | IL | 17033 | 18,300 |
| Hancock County | IL | 17067 | 17,186 |
| Piatt County | IL | 17147 | 16,714 |
| Union County | IL | 17181 | 16,667 |
| Bond County | IL | 17005 | 16,450 |
| Edgar County | IL | 17045 | 16,334 |
| Warren County | IL | 17187 | 16,185 |
| Wayne County | IL | 17191 | 15,761 |
| Carroll County | IL | 17015 | 15,526 |
| Richland County | IL | 17159 | 15,488 |
| Mercer County | IL | 17131 | 15,487 |
| De Witt County | IL | 17039 | 15,365 |
| Clark County | IL | 17023 | 15,088 |
| Lawrence County | IL | 17101 | 14,813 |
| Moultrie County | IL | 17139 | 14,342 |
| Pike County | IL | 17149 | 14,342 |
| Massac County | IL | 17127 | 13,661 |
| Washington County | IL | 17189 | 13,536 |
| White County | IL | 17193 | 13,401 |
| Johnson County | IL | 17087 | 13,326 |
| Ford County | IL | 17053 | 13,250 |
| Clay County | IL | 17025 | 12,999 |
| Cass County | IL | 17017 | 12,596 |
| Mason County | IL | 17125 | 12,523 |
| Menard County | IL | 17129 | 11,954 |
| Marshall County | IL | 17123 | 11,683 |
| Greene County | IL | 17061 | 11,543 |
| Wabash County | IL | 17185 | 10,942 |
| Cumberland County | IL | 17035 | 10,261 |
| Jasper County | IL | 17079 | 9,144 |
| Hamilton County | IL | 17065 | 7,911 |
| Schuyler County | IL | 17169 | 6,733 |
| Brown County | IL | 17009 | 6,294 |
| Henderson County | IL | 17071 | 6,088 |
| Edwards County | IL | 17047 | 5,968 |
| Putnam County | IL | 17155 | 5,561 |
| Stark County | IL | 17175 | 5,218 |
| Pulaski County | IL | 17153 | 4,911 |
| Scott County | IL | 17171 | 4,710 |
| Alexander County | IL | 17003 | 4,695 |
| Gallatin County | IL | 17059 | 4,670 |
| Calhoun County | IL | 17013 | 4,317 |
| Pope County | IL | 17151 | 3,707 |
| Hardin County | IL | 17069 | 3,569 |