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Missouri counties

Medicare Advantage and marketplace plans are set by area, so start with your county. 115 listed.

CountyPopulation (2023 est.)Rank in Missouri
Adair County25,12243
Andrew County18,12760
Atchison County5,107108
Audrain County24,39444
Barry County35,26534
Barton County11,73178
Bates County16,24264
Benton County20,55255
Bollinger County10,54482
Boone County189,4638
Buchanan County82,95615
Butler County41,94827
Caldwell County8,95591
Callaway County44,73124
Camden County44,04425
Cape Girardeau County82,98414
Carroll County8,39197
Carter County5,303107
Cass County111,73211
Cedar County14,67269
Chariton County7,399100
Christian County94,42213
Clark County6,641102
Clay County259,7726
Clinton County21,54853
Cole County77,27816
Cooper County16,94763
Crawford County22,71950
Dade County7,71699
Dallas County17,76862
Daviess County8,55195
DeKalb County9,89985
Dent County14,64770
Douglas County12,22875
Dunklin County27,03240
Franklin County106,40412
Gasconade County14,70568
Gentry County6,287103
Greene County304,6114
Grundy County9,81587
Harrison County8,22098
Henry County22,48551
Hickory County8,71893
Holt County4,248111
Howard County10,10184
Howell County40,73529
Iron County9,44089
Jackson County718,5602
Jasper County125,0569
Jefferson County231,2307
Johnson County54,96221
Knox County3,723113
Laclede County36,68033
Lafayette County33,19635
Lawrence County38,87230
Lewis County9,81886
Lincoln County64,69918
Linn County11,79177
Livingston County14,55772
Macon County15,16167
Madison County12,69874
Maries County8,43096
Marion County28,33639
McDonald County23,90346
Mercer County3,469114
Miller County25,59042
Mississippi County11,82276
Moniteau County15,25666
Monroe County8,69894
Montgomery County11,45979
Morgan County21,97052
New Madrid County15,42465
Newton County60,67719
Nodaway County20,69554
Oregon County8,72092
Osage County13,46873
Ozark County8,97090
Pemiscot County14,61371
Perry County18,95058
Pettis County43,53026
Phelps County45,28423
Pike County17,93561
Platte County111,94010
Polk County32,78036
Pulaski County53,81222
Putnam County4,638110
Ralls County10,48983
Randolph County24,10945
Ray County23,18248
Reynolds County5,950104
Ripley County10,80681
Saline County23,04949
Schuyler County4,053112
Scotland County4,676109
Scott County37,88931
Shannon County7,238101
Shelby County5,931105
St. Charles County416,6593
St. Clair County9,75288
St. Francois County67,05817
St. Louis city281,7545
St. Louis County987,0591
Ste. Genevieve County18,64259
Stoddard County28,39738
Stone County32,65837
Sullivan County5,797106
Taney County56,77520
Texas County25,61941
Vernon County19,71056
Warren County37,80632
Washington County23,53447
Wayne County10,81180
Webster County41,47228
Worth County1,907115
Wright County19,40357

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.

Do it yourself

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Medicare

Medicare Open Enrollment starts October 15th

Take a look at Missouri plans, or go ahead and enroll yourself. Call if you need any help with your application.

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Under 65 · ACA

ACA Open Enrollment opens November 1st

Take a look at Missouri plans, or go ahead and enroll yourself when it opens. Call if you need any help with your application.

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Short-term · TriTerm

Need coverage in between?

Short-term and TriTerm plans can start quickly and help with big unexpected medical bills. They are not ACA plans: they can ask health questions, may not cover pre-existing conditions, and what is offered varies by state. See what Missouri allows.

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Questions along the way? Call 855-367-1095 for assistance.