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Iowa Medicare, by the Numbers

The data layer behind our Iowa guide and all 59 city pages, in one place: CMS enrollment, Census demographics, and federal shortage designations, county by county.

Plans we accept in Iowa covering ~93.8% of Iowa's Medicare beneficiaries
  • Original Medicare
  • UnitedHealthcare ~43% of MA members
  • Aetna ~27% of MA members
  • Iowa Blue Cross Blue Shield ~13% of MA members

Coverage data 2025. Plan networks change - we confirm exactly what your plan covers before any work begins.

699,242Medicare beneficiaries statewide (2025)
38.1%chose Medicare Advantage plans
85,624dual-eligible for Medicare and Medicaid
164,945Iowans 65+ live alone
120 minmedian ER visit statewide (CMS)
163federal primary-care shortage designations

Medicare Enrollment by County

Counties covered by our city pages (41 counties, 529,317 beneficiaries). Each county links to its anchor city page.

County Medicare beneficiaries Medicare Advantage share Dual-eligible Residents 65+ Shortage designations
Polk County 90,166 44% 12,316 68,026 3
Linn County 47,640 48.3% 5,936 38,716 1
Scott County 37,250 47.8% 4,878 29,851 2
Black Hawk County 28,654 50.3% 4,476 22,833 2
Johnson County 25,293 34.6% 2,828 19,951 1
Dubuque County 23,002 60.4% 2,546 18,570 2
Pottawattamie County 21,684 45.4% 3,396 17,147 3
Woodbury County 20,204 45.8% 3,400 16,444 2
Story County 15,954 27.7% 1,454 12,773 1
Dallas County 15,328 38.3% 1,306 13,004 2
Cerro Gordo County 12,023 28.5% 1,598 9,845 1
Clinton County 11,553 42.9% 1,630 9,301 1
Warren County 11,224 42.6% 934 8,813 0
Des Moines County 10,043 31.8% 1,415 8,144 3
Muscatine County 9,470 41.6% 1,334 7,509 1
Jasper County 8,927 41.9% 1,182 7,329 2
Marshall County 8,920 41.3% 1,402 7,378 1
Lee County 8,767 24.4% 1,313 7,208 2
Webster County 8,400 34.4% 1,241 7,258 5
Marion County 7,930 34.3% 792 6,347 0
Wapello County 7,822 45.1% 1,498 6,362 3
Sioux County 6,714 18.3% 524 5,727 1
Boone County 6,361 35.4% 614 5,234 0
Bremer County 5,918 34.6% 377 4,901 3
Dickinson County 5,804 19.9% 403 4,921 0
Plymouth County 5,773 29.5% 481 4,956 0
Washington County 5,527 33.7% 612 4,472 1
Carroll County 5,428 21.6% 625 4,333 0
Winneshiek County 5,381 20.4% 376 4,517 0
Fayette County 5,315 32.3% 745 4,291 1
Mahaska County 4,928 38.9% 703 4,191 1
Jefferson County 4,871 45.7% 680 4,033 2
Henry County 4,794 27.3% 587 3,924 4
Poweshiek County 4,559 31.2% 414 3,900 1
Hardin County 4,540 30.6% 502 3,854 0
Clay County 4,280 18.7% 514 3,600 0
Floyd County 4,063 28.6% 578 3,523 1
Buena Vista County 3,975 21.5% 506 3,317 2
Cass County 3,732 25.1% 560 3,044 5
Hamilton County 3,586 25.5% 364 3,166 4
Crawford County 3,514 24.4% 449 2,951 1

Statewide, 38.1% of beneficiaries chose Medicare Advantage in 2025. Counties above that line see more prior authorizations and more denials worth appealing; counties below it lean on Medigap rights, which in Iowa follow the federal rule at 65 (one guaranteed six-month window, no birthday rule, no year-round switching) with no state-mandated guaranteed-issue right for beneficiaries under 65 who qualify through disability or ESRD. About 8.2% of Iowa seniors live below the poverty line, the group most likely to qualify for unclaimed help: Extra Help and the Medicare Savings Programs. For the full rundown, sources included, see our Iowa patient advocacy hub.

The Numbers Are the Backdrop. The Help Is the Point.

One dedicated advocate for the bills, appeals, appointments, and paperwork, serving every Iowa county virtually, usually at $0 with Medicare.

Or start from your city: every Iowa city we serve.

Sources: CMS Medicare Monthly Enrollment (2025); US Census Bureau ACS 2023 5-year; CMS Care Compare Timely & Effective Care (median ER minutes, period ending 09/30/2025); HRSA Health Professional Shortage Area designation file. Data retrieved 2026-09-04. Understood Care is an independent private advocacy service, not a government agency.