CMS Medicare enrollment · April 2026
Iowa Medicare Enrollment
State and county enrollment from CMS, including Original Medicare, Medicare Advantage and Other Health Plans, and Part D coverage.
Informational only. These enrollment counts do not compare plans or provide medical, financial, or enrollment advice.
Iowa enrollment figures
- Total Medicare enrollment
- 706.7K
- Original Medicare
- 440.1K
- MA & Other share
- 37.7%
- Part D coverage
- 84.2%
706,712
440,079 beneficiaries
CMS combined delivery-system measure
594,730 beneficiaries
County enrollment
100 CMS county rows for Iowa. Unavailable values remain marked as not reported rather than estimated.
| County | Total | Original Medicare | MA & Other | MA & Other share | Part D share |
|---|---|---|---|---|---|
| Adair County | 1,902 | 1,400 | 502 | 26.4% | 84% |
| Adams County | 1,105 | 930 | 175 | 15.8% | 85.3% |
| Allamakee County | 3,797 | 2,897 | 900 | 23.7% | 84% |
| Appanoose County | 3,456 | 2,014 | 1,442 | 41.7% | 85.4% |
| Audubon County | 1,575 | 1,261 | 314 | 19.9% | 87.6% |
| Benton County | 6,155 | 3,722 | 2,433 | 39.5% | 85.7% |
| Black Hawk County | 28,805 | 14,546 | 14,259 | 49.5% | 87.5% |
| Boone County | 6,389 | 4,187 | 2,202 | 34.5% | 84.1% |
| Bremer County | 5,949 | 3,982 | 1,967 | 33.1% | 87.6% |
| Buchanan County | 4,919 | 2,901 | 2,018 | 41% | 86.7% |
| Buena Vista County | 4,016 | 3,168 | 848 | 21.1% | 81.9% |
| Butler County | 3,974 | 2,686 | 1,288 | 32.4% | 87.3% |
| Calhoun County | 2,749 | 2,043 | 706 | 25.7% | 85.3% |
| Carroll County | 5,475 | 4,337 | 1,138 | 20.8% | 85.2% |
| Cass County | 3,782 | 2,858 | 924 | 24.4% | 84.4% |
| Cedar County | 4,450 | 2,814 | 1,636 | 36.8% | 82.9% |
| Cerro Gordo County | 12,074 | 8,704 | 3,370 | 27.9% | 83.3% |
| Cherokee County | 3,211 | 2,546 | 665 | 20.7% | 83.3% |
| Chickasaw County | 3,036 | 2,294 | 742 | 24.4% | 85.4% |
| Clarke County | 2,156 | 1,249 | 907 | 42.1% | 81.6% |
| Clay County | 4,283 | 3,459 | 824 | 19.2% | 85.1% |
| Clayton County | 5,141 | 3,308 | 1,833 | 35.7% | 84.5% |
| Clinton County | 11,655 | 6,644 | 5,011 | 43% | 85.7% |
| Crawford County | 3,551 | 2,708 | 843 | 23.7% | 82.8% |
| Dallas County | 15,817 | 9,758 | 6,059 | 38.3% | 85.1% |
| Davis County | 1,905 | 1,312 | 593 | 31.1% | 84.5% |
| Decatur County | 1,904 | 1,250 | 654 | 34.3% | 83.3% |
| Delaware County | 4,415 | 2,809 | 1,606 | 36.4% | 87.5% |
| Des Moines County | 10,118 | 6,966 | 3,152 | 31.2% | 85.1% |
| Dickinson County | 5,894 | 4,759 | 1,135 | 19.3% | 86.2% |
| Dubuque County | 23,276 | 9,060 | 14,216 | 61.1% | 85.5% |
| Emmet County | 2,471 | 2,057 | 414 | 16.8% | 82% |
| Fayette County | 5,321 | 3,577 | 1,744 | 32.8% | 85.6% |
| Floyd County | 4,085 | 2,928 | 1,157 | 28.3% | 84.6% |
| Franklin County | 2,400 | 1,931 | 469 | 19.5% | 84.7% |
| Fremont County | 1,893 | 1,372 | 521 | 27.5% | 83% |
| Greene County | 2,487 | 1,597 | 890 | 35.8% | 84.7% |
| Grundy County | 3,061 | 1,902 | 1,159 | 37.9% | 88% |
| Guthrie County | 3,134 | 2,046 | 1,088 | 34.7% | 85.2% |
| Hamilton County | 3,584 | 2,672 | 912 | 25.4% | 83% |
| Hancock County | 2,729 | 2,228 | 501 | 18.4% | 82.9% |
| Hardin County | 4,522 | 3,142 | 1,380 | 30.5% | 85.1% |
| Harrison County | 3,741 | 2,595 | 1,146 | 30.6% | 81.7% |
| Henry County | 4,827 | 3,493 | 1,334 | 27.6% | 84.7% |
| Howard County | 2,469 | 1,999 | 470 | 19% | 83.3% |
| Humboldt County | 2,454 | 1,934 | 520 | 21.2% | 83.5% |
| Ida County | 1,759 | 1,384 | 375 | 21.3% | 84.3% |
| Iowa County | 4,154 | 2,709 | 1,445 | 34.8% | 83.5% |
| Jackson County | 5,363 | 2,830 | 2,533 | 47.2% | 84.8% |
| Jasper County | 9,011 | 5,185 | 3,826 | 42.5% | 85.9% |
| Jefferson County | 4,871 | 2,672 | 2,199 | 45.1% | 79.9% |
| Johnson County | 25,792 | 17,300 | 8,492 | 32.9% | 77.4% |
| Jones County | 5,044 | 2,713 | 2,331 | 46.2% | 85.6% |
| Keokuk County | 2,577 | 1,681 | 896 | 34.8% | 81.8% |
| Kossuth County | 4,089 | 3,344 | 745 | 18.2% | 83% |
| Lee County | 8,793 | 6,639 | 2,154 | 24.5% | 83.1% |
| Linn County | 48,200 | 24,797 | 23,403 | 48.6% | 86.7% |
| Louisa County | 2,575 | 1,710 | 865 | 33.6% | 83.5% |
| Lucas County | 2,272 | 1,482 | 790 | 34.8% | 81.7% |
| Lyon County | 2,541 | 2,029 | 512 | 20.1% | 84.2% |
| Madison County | 3,756 | 2,164 | 1,592 | 42.4% | 84.1% |
| Mahaska County | 4,996 | 3,127 | 1,869 | 37.4% | 83.4% |
| Marion County | 7,991 | 5,294 | 2,697 | 33.8% | 84.1% |
| Marshall County | 8,952 | 5,208 | 3,744 | 41.8% | 85.6% |
| Mills County | 3,536 | 2,307 | 1,229 | 34.8% | 78.4% |
| Mitchell County | 2,646 | 2,163 | 483 | 18.3% | 83.7% |
| Monona County | 2,430 | 1,538 | 892 | 36.7% | 84.9% |
| Monroe County | 1,931 | 1,277 | 654 | 33.9% | 84.7% |
| Montgomery County | 2,830 | 1,945 | 885 | 31.3% | 83.3% |
| Muscatine County | 9,603 | 5,973 | 3,630 | 37.8% | 84% |
| O'Brien County | 3,545 | 2,916 | 629 | 17.7% | 84.4% |
| Osceola County | 1,526 | 1,242 | 284 | 18.6% | 81.8% |
| Page County | 4,112 | 3,037 | 1,075 | 26.1% | 84.9% |
| Palo Alto County | 2,472 | 2,115 | 357 | 14.4% | 81.8% |
| Plymouth County | 5,896 | 4,217 | 1,679 | 28.5% | 84.9% |
| Pocahontas County | 1,969 | 1,491 | 478 | 24.3% | 83.8% |
| Polk County | 91,545 | 51,066 | 40,479 | 44.2% | 83.7% |
| Pottawattamie County | 21,894 | 11,842 | 10,052 | 45.9% | 81.9% |
| Poweshiek County | 4,549 | 3,137 | 1,412 | 31% | 85.2% |
| Ringgold County | 1,368 | 1,076 | 292 | 21.3% | 86.3% |
| Sac County | 2,692 | 2,263 | 429 | 15.9% | 84.8% |
| Scott County | 37,682 | 19,515 | 18,167 | 48.2% | 83.6% |
| Shelby County | 3,319 | 2,498 | 821 | 24.7% | 85.7% |
| Sioux County | 6,791 | 5,958 | 833 | 12.3% | 85.8% |
| Story County | 16,143 | 11,727 | 4,416 | 27.4% | 84.6% |
| Tama County | 4,139 | 2,513 | 1,626 | 39.3% | 85.5% |
| Taylor County | 1,627 | 1,357 | 270 | 16.6% | 80.4% |
| Union County | 3,090 | 2,202 | 888 | 28.7% | 84.9% |
| Unknown | Not reported | Not reported | Not reported | Not reported | Not reported |
| Van Buren County | 1,966 | 1,320 | 646 | 32.9% | 83.1% |
| Wapello County | 7,804 | 4,356 | 3,448 | 44.2% | 83.6% |
| Warren County | 11,450 | 6,580 | 4,870 | 42.5% | 83.1% |
| Washington County | 5,538 | 3,671 | 1,867 | 33.7% | 82.3% |
| Wayne County | 1,651 | 1,089 | 562 | 34% | 85.1% |
| Webster County | 8,455 | 5,575 | 2,880 | 34.1% | 83.1% |
| Winnebago County | 2,825 | 2,202 | 623 | 22.1% | 84.1% |
| Winneshiek County | 5,451 | 4,631 | 820 | 15% | 86.1% |
| Woodbury County | 20,355 | 11,151 | 9,204 | 45.2% | 81.8% |
| Worth County | 1,906 | 1,409 | 497 | 26.1% | 82% |
| Wright County | 3,128 | 2,407 | 721 | 23% | 84% |
Source and interpretation
CMS Medicare Monthly Enrollment, April 2026, published 2026-07-23. “MA & Other” retains the official combined CMS field label.
- CMS suppresses some small counts with an asterisk; suppressed values remain null in this snapshot.
- Medicare Advantage and Other Health Plans is the CMS-published combined measure and is not limited to Medicare Advantage alone.
- Enrollment counts describe a reporting month and do not compare plan benefits, provider networks, quality, or personal costs.