Iowa counties

Medicare Advantage and marketplace plans are set by area, so start with your county. 99 listed.

County	Population (2023 est.)	Rank in Iowa	Medicare plans leaving (2027)
Adair County	7,389	88	9
Adams County	3,544	99	13
Allamakee County	14,074	56	10
Appanoose County	12,119	62	10
Audubon County	5,534	97	17
Benton County	25,796	24	12
Black Hawk County	130,471	5	11
Boone County	26,590	23	12
Bremer County	25,307	26	14
Buchanan County	20,691	30	10
Buena Vista County	20,567	31	11
Butler County	14,172	55	15
Calhoun County	9,763	75	12
Carroll County	20,522	32	12
Cass County	13,130	58	11
Cedar County	18,302	38	13
Cerro Gordo County	42,406	13	9
Cherokee County	11,605	66	14
Chickasaw County	11,658	65	16
Clarke County	9,588	77	11
Clay County	16,511	44	12
Clayton County	16,969	42	18
Clinton County	46,158	12	12
Crawford County	16,013	47	11
Dallas County	111,092	6	14
Davis County	9,169	81	16
Decatur County	7,665	86	9
Delaware County	17,600	40	13
Des Moines County	38,253	16	18
Dickinson County	18,056	39	12
Dubuque County	98,887	8	8
Emmet County	9,229	80	9
Fayette County	19,210	36	16
Floyd County	15,326	49	12
Franklin County	9,875	74	13
Fremont County	6,458	94	12
Greene County	8,584	84	14
Grundy County	12,384	60	12
Guthrie County	10,722	67	10
Hamilton County	14,729	51	12
Hancock County	10,615	68	12
Hardin County	16,463	45	12
Harrison County	14,670	52	15
Henry County	19,547	34	12
Howard County	9,376	79	17
Humboldt County	9,500	78	12
Ida County	6,833	92	15
Iowa County	16,381	46	11
Jackson County	19,342	35	12
Jasper County	37,919	17	13
Jefferson County	15,440	48	12
Johnson County	157,528	4	12
Jones County	20,900	29	12
Keokuk County	9,914	73	11
Kossuth County	14,396	54	9
Lee County	32,565	22	16
Linn County	228,972	2	12
Louisa County	10,513	71	15
Lucas County	8,747	83	10
Lyon County	12,324	61	16
Madison County	16,971	41	13
Mahaska County	21,874	28	11
Marion County	33,770	21	11
Marshall County	40,014	15	13
Mills County	14,633	53	16
Mitchell County	10,518	70	17
Monona County	8,493	85	10
Monroe County	7,504	87	10
Montgomery County	10,139	72	12
Muscatine County	42,218	14	13
O'Brien County	14,012	57	12
Osceola County	5,978	95	13
Page County	15,014	50	12
Palo Alto County	8,810	82	10
Plymouth County	25,722	25	11
Pocahontas County	6,976	91	15
Polk County	505,255	1	13
Pottawattamie County	93,179	10	15
Poweshiek County	18,453	37	12
Ringgold County	4,642	98	10
Sac County	9,686	76	15
Scott County	174,270	3	16
Shelby County	11,806	64	13
Sioux County	36,246	19	11
Story County	98,566	9	20
Tama County	16,833	43	12
Taylor County	5,924	96	14
Union County	11,906	63	9
Van Buren County	7,266	90	16
Wapello County	35,166	20	8
Warren County	55,205	11	13
Washington County	22,560	27	13
Wayne County	6,557	93	10
Webster County	36,485	18	12
Winnebago County	10,571	69	11
Winneshiek County	19,815	33	9
Woodbury County	105,951	7	16
Worth County	7,297	89	10
Wright County	12,656	59	12

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

Talk with a licensed agent about Iowa coverage

Call Lander LLC to go over your options. There is no cost to call or to speak with an agent, and you are never required to enroll in anything.

Call 855-367-1095 Open 8 AM-10 PM Eastern time

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.

Find coverage in Iowa

Iowa counties

Talk with a licensed agent about Iowa coverage

Want help comparing plans and enrolling?

Medicare Open Enrollment is happening now

ACA Open Enrollment opens November 1st