Ranking of Illinois Counties By Population in 2024
Updated on June 21, 2025.
Based on the US Census Vintage data estimates, in 2024, the Population for Illinois was 12.71M. Among all Illinois counties, Cook County had the highest population (5.18M), followed by DuPage County (937.14K), and Lake County (718.60K).
The chart below shows the top 10 counties, and the table below shows the ranking of all Illinois counties.
You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.
Related Topics: Illinois Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage), 2024 Census.
See this for other years:
Ranking of Illinois Counties By Population in 2024
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| Rank | County | Population |
|---|---|---|
| 1 | Cook County | 5182617 |
| 2 | DuPage County | 937142 |
| 3 | Lake County | 718604 |
| 4 | Will County | 708583 |
| 5 | Kane County | 520997 |
| 6 | McHenry County | 315959 |
| 7 | Winnebago County | 283790 |
| 8 | Madison County | 263017 |
| 9 | St. Clair County | 251149 |
| 10 | Champaign County | 212374 |
| 11 | Sangamon County | 194345 |
| 12 | Peoria County | 179630 |
| 13 | McLean County | 172069 |
| 14 | Kendall County | 143171 |
| 15 | Rock Island County | 142731 |
| 16 | Tazewell County | 129821 |
| 17 | LaSalle County | 108390 |
| 18 | Kankakee County | 106410 |
| 19 | DeKalb County | 101335 |
| 20 | Macon County | 100737 |
| 21 | Vermilion County | 71106 |
| 22 | Williamson County | 67064 |
| 23 | Adams County | 64109 |
| 24 | Whiteside County | 54657 |
| 25 | Grundy County | 53835 |
| 26 | Boone County | 53313 |
| 27 | Jackson County | 53199 |
| 28 | Ogle County | 51345 |
| 29 | Knox County | 48716 |
| 30 | Henry County | 48177 |
| 31 | Coles County | 46423 |
| 32 | Macoupin County | 43895 |
| 33 | Stephenson County | 43088 |
| 34 | Woodford County | 38290 |
| 35 | Clinton County | 37087 |
| 36 | Franklin County | 37033 |
| 37 | Marion County | 36437 |
| 38 | Jefferson County | 36107 |
| 39 | Livingston County | 35375 |
| 40 | Monroe County | 34969 |
| 41 | Effingham County | 34602 |
| 42 | Lee County | 33544 |
| 43 | Christian County | 33247 |
| 44 | Morgan County | 32618 |
| 45 | Fulton County | 32510 |
| 46 | Bureau County | 32486 |
| 47 | Randolph County | 29903 |
| 48 | Montgomery County | 27615 |
| 49 | Logan County | 27518 |
| 50 | McDonough County | 26662 |
| 51 | Iroquois County | 26067 |
| 52 | Saline County | 22826 |
| 53 | Jo Daviess County | 21528 |
| 54 | Fayette County | 21157 |
| 55 | Jersey County | 21150 |
| 56 | Shelby County | 20542 |
| 57 | Perry County | 20272 |
| 58 | Douglas County | 19824 |
| 59 | Crawford County | 18388 |
| 60 | Hancock County | 17008 |
| 61 | Union County | 16886 |
| 62 | Piatt County | 16628 |
| 63 | Bond County | 16576 |
| 64 | Edgar County | 16398 |
| 65 | Warren County | 16217 |
| 66 | Wayne County | 15928 |
| 67 | Carroll County | 15444 |
| 68 | Richland County | 15362 |
| 69 | De Witt County | 15319 |
| 70 | Mercer County | 15292 |
| 71 | Clark County | 15076 |
| 72 | Lawrence County | 14801 |
| 73 | Moultrie County | 14365 |
| 74 | Pike County | 14258 |
| 75 | Massac County | 13627 |
| 76 | Washington County | 13535 |
| 77 | Ford County | 13451 |
| 78 | White County | 13395 |
| 79 | Johnson County | 13320 |
| 80 | Clay County | 12821 |
| 81 | Cass County | 12713 |
| 82 | Mason County | 12543 |
| 83 | Menard County | 11963 |
| 84 | Marshall County | 11552 |
| 85 | Greene County | 11417 |
| 86 | Wabash County | 10979 |
| 87 | Cumberland County | 10305 |
| 88 | Jasper County | 9092 |
| 89 | Hamilton County | 7818 |
| 90 | Schuyler County | 6750 |
| 91 | Brown County | 6307 |
| 92 | Henderson County | 6048 |
| 93 | Edwards County | 5984 |
| 94 | Putnam County | 5633 |
| 95 | Stark County | 5272 |
| 96 | Scott County | 4880 |
| 97 | Pulaski County | 4879 |
| 98 | Gallatin County | 4690 |
| 99 | Alexander County | 4594 |
| 100 | Calhoun County | 4224 |
| 101 | Pope County | 3703 |
| 102 | Hardin County | 3550 |