CMS Medicare enrollment · June 2026
Washington 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.
Washington enrollment figures
- Total Medicare enrollment
- 1.6M
- Original Medicare
- 796.2K
- MA & Other share
- 49.7%
- Part D coverage
- 79.1%
1,583,566
796,152 beneficiaries
CMS combined delivery-system measure
1,252,449 beneficiaries
County enrollment
40 CMS county rows for Washington. Unavailable values remain marked as not reported rather than estimated.
| County | Total | Original Medicare | MA & Other | MA & Other share | Part D share |
|---|---|---|---|---|---|
| Adams County | 2,978 | 1,946 | 1,032 | 34.7% | 77.1% |
| Asotin County | 6,947 | 5,068 | 1,879 | 27% | 79.1% |
| Benton County | 41,786 | 28,264 | 13,522 | 32.4% | 80% |
| Chelan County | 20,265 | 12,034 | 8,231 | 40.6% | 82.2% |
| Clallam County | 29,891 | 22,774 | 7,117 | 23.8% | 76.9% |
| Clark County | 108,266 | 35,562 | 72,704 | 67.2% | 82.8% |
| Columbia County | 1,360 | 1,048 | 312 | 22.9% | 74.7% |
| Cowlitz County | 29,234 | 9,471 | 19,763 | 67.6% | 83.9% |
| Douglas County | 9,549 | 5,668 | 3,881 | 40.6% | 81.9% |
| Ferry County | 2,510 | 1,825 | 685 | 27.3% | 69.5% |
| Franklin County | 12,787 | 8,050 | 4,737 | 37% | 78.9% |
| Garfield County | 746 | 645 | 101 | 13.5% | 75.2% |
| Grant County | 18,284 | 11,483 | 6,801 | 37.2% | 79.6% |
| Grays Harbor County | 22,686 | 16,846 | 5,840 | 25.7% | 75.3% |
| Island County | 27,292 | 15,944 | 11,348 | 41.6% | 73.6% |
| Jefferson County | 15,214 | 12,507 | 2,707 | 17.8% | 78.5% |
| King County | 368,143 | 170,775 | 197,368 | 53.6% | 81% |
| Kitsap County | 67,059 | 40,066 | 26,993 | 40.3% | 71.7% |
| Kittitas County | 10,837 | 7,807 | 3,030 | 28% | 77.2% |
| Klickitat County | 7,154 | 6,316 | 838 | 11.7% | 72.6% |
| Lewis County | 23,253 | 10,073 | 13,180 | 56.7% | 80% |
| Lincoln County | 3,769 | 3,039 | 730 | 19.4% | 74.8% |
| Mason County | 20,048 | 10,930 | 9,118 | 45.5% | 76.7% |
| Okanogan County | 12,218 | 8,591 | 3,627 | 29.7% | 74.8% |
| Pacific County | 9,304 | 7,241 | 2,063 | 22.2% | 76.2% |
| Pend Oreille County | 4,677 | 3,245 | 1,432 | 30.6% | 75.2% |
| Pierce County | 175,880 | 84,591 | 91,289 | 51.9% | 74.2% |
| San Juan County | 6,784 | 5,563 | 1,221 | 18% | 80.9% |
| Skagit County | 35,976 | 19,689 | 16,287 | 45.3% | 80.5% |
| Skamania County | 3,029 | 2,250 | 779 | 25.7% | 74.6% |
| Snohomish County | 152,672 | 61,664 | 91,008 | 59.6% | 80.7% |
| Spokane County | 122,995 | 52,690 | 70,305 | 57.2% | 80.3% |
| Stevens County | 14,675 | 9,390 | 5,285 | 36% | 74.3% |
| Thurston County | 70,407 | 33,215 | 37,192 | 52.8% | 76.7% |
| Unknown | Not reported | Not reported | Not reported | Not reported | Not reported |
| Wahkiakum County | 1,761 | 952 | 809 | 45.9% | 79.7% |
| Walla Walla County | 14,961 | 9,978 | 4,983 | 33.3% | 78.6% |
| Whatcom County | 54,194 | 28,783 | 25,411 | 46.9% | 82.8% |
| Whitman County | 7,059 | 5,027 | 2,032 | 28.8% | 80.3% |
| Yakima County | 46,913 | 25,139 | 21,774 | 46.4% | 81.2% |
Source and interpretation
CMS Medicare Monthly Enrollment, June 2026, published 2026-09-23. “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.