Counties in Illinois
List of Counties in Illinois.
| Counties | Population | Area (km2) |
|---|---|---|
| Cook County | 5,240,700 | 4,237.428 |
| DuPage County | 932,126 | 871.279 |
| Lake County | 703,019 | 3,538.139 |
| Will County | 682,829 | 2,199.828 |
| Kane County | 523,643 | 1,357.743 |
| McHenry County | 307,409 | 1,582.449 |
| Winnebago County | 290,666 | 1,348.286 |
| Madison County | 267,225 | 1,913.282 |
| Saint Clair County | 264,052 | 1,741.612 |
| Champaign County | 204,897 | 2,587.113 |
| Sangamon County | 199,145 | 2,267.976 |
| Peoria County | 188,429 | 1,637.124 |
| Rock Island County | 147,258 | 1,160.688 |
| Tazewell County | 136,352 | 1,700.838 |
| Kendall County | 119,348 | 834.692 |
| LaSalle County | 112,183 | 2,977.005 |
| Kankakee County | 112,120 | 1,766.024 |
| Macon County | 109,278 | 1,517.727 |
| DeKalb County | 104,741 | 1,644.265 |
| Vermilion County | 80,329 | 2,333.759 |
| Adams County | 67,130 | 2,256.991 |
| Williamson County | 66,924 | 1,153.713 |
| Jackson County | 59,814 | 1,558.935 |
| Whiteside County | 57,557 | 1,805.151 |
| Boone County | 53,957 | 731.5 |
| Coles County | 53,697 | 1,329.795 |
| Ogle County | 52,385 | 1,975.838 |
| Knox County | 52,078 | 1,867.797 |
| Grundy County | 50,228 | 1,118.404 |
| Henry County | 49,860 | 2,149.239 |
| Macoupin County | 46,880 | 2,253.023 |
| Stephenson County | 46,740 | 1,462.734 |
| Woodford County | 39,273 | 1,400.86 |
| Franklin County | 39,202 | 1,124.07 |
| Jefferson County | 38,644 | 1,511.93 |
| Marion County | 38,622 | 1,489.4 |
| Livingston County | 38,186 | 2,709.992 |
| Clinton County | 37,907 | 1,295.339 |
| Fulton County | 36,346 | 2,287.465 |
| Morgan County | 35,067 | 1,490.047 |
| Lee County | 34,858 | 1,882.616 |
| Effingham County | 34,307 | 1,248.518 |
| Christian County | 34,298 | 1,864.741 |
| Bureau County | 34,056 | 2,268.217 |
| Monroe County | 33,493 | 1,029.162 |
| Randolph County | 32,890 | 1,541.346 |
| McDonough County | 32,464 | 1,522.232 |
| Logan County | 29,964 | 1,603.561 |
| Montgomery County | 29,654 | 1,830.197 |
| Iroquois County | 28,982 | 2,898.259 |
| Saline County | 24,939 | 999.343 |
| Jersey County | 22,641 | 974.579 |
| Jo Daviess County | 22,407 | 1,598.734 |
| Shelby County | 22,119 | 1,987.855 |
| Fayette County | 22,060 | 1,875.376 |
| Perry County | 21,887 | 1,154.536 |
| Douglas County | 19,887 | 1,078.977 |
| Crawford County | 19,505 | 1,160.615 |
| Hancock County | 18,618 | 2,110.294 |
| Edgar County | 17,960 | 1,616.971 |
| Warren County | 17,726 | 1,404.796 |
| Union County | 17,583 | 1,097.286 |
| Bond County | 17,470 | 990.543 |
| Wayne County | 16,612 | 1,858.798 |
| Lawrence County | 16,558 | 967.366 |
| Piatt County | 16,433 | 1,143.795 |
| De Witt County | 16,420 | 1,048.425 |
| Clark County | 16,182 | 1,308.181 |
| Richland County | 16,182 | 941.633 |
| Mercer County | 16,178 | 1,471.273 |
| Pike County | 16,150 | 2,197.416 |
| Massac County | 15,073 | 627.94 |
| Carroll County | 14,910 | 1,206.645 |
| Moultrie County | 14,876 | 888.188 |
| White County | 14,549 | 1,296.449 |
| Washington County | 14,448 | 1,467.667 |
| Mason County | 14,248 | 1,457.065 |
| Ford County | 13,832 | 1,257.826 |
| Greene County | 13,629 | 1,410.01 |
| Clay County | 13,566 | 1,212.318 |
| Cass County | 13,324 | 1,000.721 |
| Johnson County | 12,677 | 906.832 |
| Menard County | 12,607 | 816.539 |
| Marshall County | 12,153 | 1,035.751 |
| Wabash County | 11,665 | 592.439 |
| Cumberland County | 10,939 | 897.876 |
| Jasper County | 9,592 | 1,291.437 |
| Hamilton County | 8,368 | 1,121.093 |
| Alexander County | 7,629 | 656.24 |
| Schuyler County | 7,444 | 1,139.423 |
| Henderson County | 6,990 | 1,028.288 |
| Brown County | 6,860 | 799.335 |
| Edwards County | 6,672 | 572.463 |
| Pulaski County | 5,908 | 532.784 |
| Stark County | 5,907 | 746.718 |
| Putnam County | 5,801 | 441.753 |
| Gallatin County | 5,415 | 847.028 |
| Scott County | 5,222 | 652.672 |
| Calhoun County | 5,059 | 733.884 |
| Pope County | 4,312 | 977.606 |
| Hardin County | 4,181 | 480.834 |
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