Illinois Counties by Population (2024)
by Kristen Carney 
Updated: June 20, 2024
The most populated counties in Illinois are Cook County with 5,087,072, DuPage County at 921,213, Lake County with 708,760, Will County at 700,728, and Kane County with 514,982. You can get the most current Census population data for all 102 Illinois counties, sorted from the most populous counties in Illinois to the least, according to the 2023 Population Estimates Program.
Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest Illinois counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!
| Rank | County | Population |
|---|---|---|
| 1 | Cook County | 5,087,072 |
| 2 | DuPage County | 921,213 |
| 3 | Lake County | 708,760 |
| 4 | Will County | 700,728 |
| 5 | Kane County | 514,982 |
| 6 | McHenry County | 312,800 |
| 7 | Winnebago County | 280,922 |
| 8 | Madison County | 262,752 |
| 9 | St. Clair County | 251,018 |
| 10 | Champaign County | 205,644 |
| 11 | Sangamon County | 193,491 |
| 12 | Peoria County | 177,513 |
| 13 | McLean County | 170,441 |
| 14 | Rock Island County | 141,236 |
| 15 | Kendall County | 139,976 |
| 16 | Tazewell County | 129,541 |
| 17 | LaSalle County | 108,309 |
| 18 | Kankakee County | 105,940 |
| 19 | Macon County | 100,591 |
| 20 | DeKalb County | 100,288 |
| 21 | Vermilion County | 71,652 |
| 22 | Williamson County | 66,706 |
| 23 | Adams County | 64,441 |
| 24 | Whiteside County | 54,498 |
| 25 | Grundy County | 53,578 |
| 26 | Boone County | 53,202 |
| 27 | Jackson County | 52,141 |
| 28 | Ogle County | 51,265 |
| 29 | Henry County | 48,448 |
| 30 | Knox County | 48,411 |
| 31 | Coles County | 46,060 |
| 32 | Macoupin County | 44,018 |
| 33 | Stephenson County | 43,105 |
| 34 | Woodford County | 38,285 |
| 35 | Franklin County | 37,138 |
| 36 | Clinton County | 36,785 |
| 37 | Marion County | 36,673 |
| 38 | Jefferson County | 36,320 |
| 39 | Livingston County | 35,320 |
| 40 | Monroe County | 34,957 |
| 41 | Effingham County | 34,331 |
| 42 | Lee County | 33,654 |
| 43 | Christian County | 33,228 |
| 44 | Bureau County | 32,729 |
| 45 | Fulton County | 32,541 |
| 46 | Morgan County | 32,140 |
| 47 | Randolph County | 29,815 |
| 48 | Montgomery County | 27,663 |
| 49 | Logan County | 27,590 |
| 50 | McDonough County | 26,839 |
| 51 | Iroquois County | 26,136 |
| 52 | Saline County | 22,873 |
| 53 | Jo Daviess County | 21,756 |
| 54 | Fayette County | 21,164 |
| 55 | Jersey County | 21,091 |
| 56 | Shelby County | 20,568 |
| 57 | Perry County | 20,503 |
| 58 | Douglas County | 19,629 |
| 59 | Crawford County | 18,300 |
| 60 | Hancock County | 17,186 |
| 61 | Piatt County | 16,714 |
| 62 | Union County | 16,667 |
| 63 | Bond County | 16,450 |
| 64 | Edgar County | 16,334 |
| 65 | Warren County | 16,185 |
| 66 | Wayne County | 15,761 |
| 67 | Carroll County | 15,526 |
| 68 | Richland County | 15,488 |
| 69 | Mercer County | 15,487 |
| 70 | De Witt County | 15,365 |
| 71 | Clark County | 15,088 |
| 72 | Lawrence County | 14,813 |
| 73 TIE | Pike County | 14,342 |
| 73 TIE | Moultrie County | 14,342 |
| 75 | Massac County | 13,661 |
| 76 | Washington County | 13,536 |
| 77 | White County | 13,401 |
| 78 | Johnson County | 13,326 |
| 79 | Ford County | 13,250 |
| 80 | Clay County | 12,999 |
| 81 | Cass County | 12,596 |
| 82 | Mason County | 12,523 |
| 83 | Menard County | 11,954 |
| 84 | Marshall County | 11,683 |
| 85 | Greene County | 11,543 |
| 86 | Wabash County | 10,942 |
| 87 | Cumberland County | 10,261 |
| 88 | Jasper County | 9,144 |
| 89 | Hamilton County | 7,911 |
| 90 | Schuyler County | 6,733 |
| 91 | Brown County | 6,294 |
| 92 | Henderson County | 6,088 |
| 93 | Edwards County | 5,968 |
| 94 | Putnam County | 5,561 |
| 95 | Stark County | 5,218 |
| 96 | Pulaski County | 4,911 |
| 97 | Scott County | 4,710 |
| 98 | Alexander County | 4,695 |
| 99 | Gallatin County | 4,670 |
| 100 | Calhoun County | 4,317 |
| 101 | Pope County | 3,707 |
| 102 | Hardin County | 3,569 |
|
United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2023. U.S. Census Bureau, Population Division. Web. May 2024. http://www.census.gov/. |
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