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Illinois counties

Medicare Advantage and marketplace plans are set by area, so start with your county. 102 listed.

CountyPopulation (2023 est.)Rank in Illinois
Adams County64,44123
Alexander County4,69598
Bond County16,45063
Boone County53,20226
Brown County6,29491
Bureau County32,72944
Calhoun County4,317100
Carroll County15,52667
Cass County12,59681
Champaign County205,64410
Christian County33,22843
Clark County15,08871
Clay County12,99980
Clinton County36,78536
Coles County46,06031
Cook County5,087,0721
Crawford County18,30059
Cumberland County10,26187
De Witt County15,36570
DeKalb County100,28820
Douglas County19,62958
DuPage County921,2132
Edgar County16,33464
Edwards County5,96893
Effingham County34,33141
Fayette County21,16454
Ford County13,25079
Franklin County37,13835
Fulton County32,54145
Gallatin County4,67099
Greene County11,54385
Grundy County53,57825
Hamilton County7,91189
Hancock County17,18660
Hardin County3,569102
Henderson County6,08892
Henry County48,44829
Iroquois County26,13651
Jackson County52,14127
Jasper County9,14488
Jefferson County36,32038
Jersey County21,09155
Jo Daviess County21,75653
Johnson County13,32678
Kane County514,9825
Kankakee County105,94018
Kendall County139,97615
Knox County48,41130
Lake County708,7603
LaSalle County108,30917
Lawrence County14,81372
Lee County33,65442
Livingston County35,32039
Logan County27,59049
Macon County100,59119
Macoupin County44,01832
Madison County262,7528
Marion County36,67337
Marshall County11,68384
Mason County12,52382
Massac County13,66175
McDonough County26,83950
McHenry County312,8006
McLean County170,44113
Menard County11,95483
Mercer County15,48769
Monroe County34,95740
Montgomery County27,66348
Morgan County32,14046
Moultrie County14,34273
Ogle County51,26528
Peoria County177,51312
Perry County20,50357
Piatt County16,71461
Pike County14,34274
Pope County3,707101
Pulaski County4,91196
Putnam County5,56194
Randolph County29,81547
Richland County15,48868
Rock Island County141,23614
Saline County22,87352
Sangamon County193,49111
Schuyler County6,73390
Scott County4,71097
Shelby County20,56856
St. Clair County251,0189
Stark County5,21895
Stephenson County43,10533
Tazewell County129,54116
Union County16,66762
Vermilion County71,65221
Wabash County10,94286
Warren County16,18565
Washington County13,53676
Wayne County15,76166
White County13,40177
Whiteside County54,49824
Will County700,7284
Williamson County66,70622
Winnebago County280,9227
Woodford County38,28534

Population: U.S. Census Bureau Population Estimates, 2023.

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Reviewed by Richard Lander, licensed insurance agent (NPN 21255551), Lander LLC. Last updated October 3, 2026. This page is educational and is not a quote, an offer of coverage, or legal or tax advice.

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Medicare

Medicare Open Enrollment starts October 15th

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Under 65 · ACA

ACA Open Enrollment opens November 1st

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