Ranking of Illinois Counties By Total Population from Census 2020
Updated on February 7, 2023.
According to the data from the US 2020 Census, the most populated Illinois county as at April 2020 was Cook County (5.28M), followed by DuPage County (932.88K), and Lake County (714.34K).
The chart below shows the top 10 most populated counties, and the table below shows the ranking of all the counties in the state of Illinois.
You can also see the ranking of counties by population for other states as well as for the whole United States.
You may also be interested in:
Related Topics: Illinois Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Illinois Counties By Total Population from Census 2020
Items per page:
0 of 0
| Rank | County | Population |
|---|---|---|
| 1 | Cook County | 5275541 |
| 2 | DuPage County | 932877 |
| 3 | Lake County | 714342 |
| 4 | Will County | 696355 |
| 5 | Kane County | 516522 |
| 6 | McHenry County | 310229 |
| 7 | Winnebago County | 285350 |
| 8 | Madison County | 265859 |
| 9 | St. Clair County | 257400 |
| 10 | Champaign County | 205865 |
| 11 | Sangamon County | 196343 |
| 12 | Peoria County | 181830 |
| 13 | McLean County | 170954 |
| 14 | Rock Island County | 144672 |
| 15 | Kendall County | 131869 |
| 16 | Tazewell County | 131343 |
| 17 | LaSalle County | 109658 |
| 18 | Kankakee County | 107502 |
| 19 | Macon County | 103998 |
| 20 | DeKalb County | 100420 |
| 21 | Vermilion County | 74188 |
| 22 | Williamson County | 67153 |
| 23 | Adams County | 65737 |
| 24 | Whiteside County | 55691 |
| 25 | Boone County | 53448 |
| 26 | Jackson County | 52974 |
| 27 | Grundy County | 52533 |
| 28 | Ogle County | 51788 |
| 29 | Knox County | 49967 |
| 30 | Henry County | 49284 |
| 31 | Coles County | 46863 |
| 32 | Macoupin County | 44967 |
| 33 | Stephenson County | 44630 |
| 34 | Woodford County | 38467 |
| 35 | Franklin County | 37804 |
| 36 | Marion County | 37729 |
| 37 | Jefferson County | 37113 |
| 38 | Clinton County | 36899 |
| 39 | Livingston County | 35815 |
| 40 | Monroe County | 34962 |
| 41 | Effingham County | 34668 |
| 42 | Lee County | 34145 |
| 43 | Christian County | 34032 |
| 44 | Fulton County | 33609 |
| 45 | Bureau County | 33244 |
| 46 | Morgan County | 32915 |
| 47 | Randolph County | 30163 |
| 48 | Montgomery County | 28288 |
| 49 | Logan County | 27987 |
| 50 | McDonough County | 27238 |
| 51 | Iroquois County | 27077 |
| 52 | Saline County | 23768 |
| 53 | Jo Daviess County | 22035 |
| 54 | Jersey County | 21512 |
| 55 | Fayette County | 21488 |
| 56 | Shelby County | 20990 |
| 57 | Perry County | 20945 |
| 58 | Douglas County | 19740 |
| 59 | Crawford County | 18679 |
| 60 | Hancock County | 17620 |
| 61 | Union County | 17244 |
| 62 | Edgar County | 16866 |
| 63 | Warren County | 16835 |
| 64 | Bond County | 16725 |
| 65 | Piatt County | 16673 |
| 66 | Wayne County | 16179 |
| 67 | Richland County | 15813 |
| 68 | Carroll County | 15702 |
| 69 | Mercer County | 15699 |
| 70 | De Witt County | 15516 |
| 71 | Clark County | 15455 |
| 72 | Lawrence County | 15280 |
| 73 | Pike County | 14739 |
| 74 | Moultrie County | 14526 |
| 75 | Massac County | 14169 |
| 76 | White County | 13877 |
| 77 | Washington County | 13761 |
| 78 | Ford County | 13534 |
| 79 | Johnson County | 13308 |
| 80 | Clay County | 13288 |
| 81 | Mason County | 13086 |
| 82 | Cass County | 13042 |
| 83 | Menard County | 12297 |
| 84 | Greene County | 11985 |
| 85 | Marshall County | 11742 |
| 86 | Wabash County | 11361 |
| 87 | Cumberland County | 10450 |
| 88 | Jasper County | 9287 |
| 89 | Hamilton County | 7993 |
| 90 | Schuyler County | 6902 |
| 91 | Henderson County | 6387 |
| 92 | Edwards County | 6245 |
| 93 | Brown County | 6244 |
| 94 | Putnam County | 5637 |
| 95 | Stark County | 5400 |
| 96 | Alexander County | 5240 |
| 97 | Pulaski County | 5193 |
| 98 | Scott County | 4949 |
| 99 | Gallatin County | 4946 |
| 100 | Calhoun County | 4437 |
| 101 | Pope County | 3763 |
| 102 | Hardin County | 3649 |