Patient Advocacy Without the Call Center
The data layer behind our Washington guide and all 53 city pages, in one place: CMS enrollment, Census demographics, and federal shortage designations, county by county.
Coverage data 2024. Plan networks change - we confirm exactly what your plan covers before any work begins.
Counties covered by our city pages (22 counties, 1,436,707 beneficiaries). Each links to its anchor city page.
| County | Medicare beneficiaries | Medicare Advantage share | Dual-eligible | Residents 65+ | Shortage designations |
|---|---|---|---|---|---|
| King County | 361,153 | 53.6% | 57,369 | 311,368 | 24 |
| Pierce County | 172,986 | 51.1% | 27,152 | 133,313 | 8 |
| Snohomish County | 149,506 | 59.4% | 21,594 | 120,158 | 12 |
| Spokane County | 121,092 | 56.6% | 20,960 | 92,555 | 8 |
| Clark County | 105,925 | 66.8% | 13,712 | 83,012 | 2 |
| Thurston County | 69,506 | 52.5% | 9,224 | 54,324 | 5 |
| Kitsap County | 65,719 | 39.6% | 7,002 | 52,865 | 6 |
| Whatcom County | 53,410 | 47% | 7,212 | 42,255 | 4 |
| Yakima County | 46,461 | 46% | 10,744 | 36,622 | 19 |
| Benton County | 41,184 | 31.1% | 5,695 | 32,722 | 4 |
| Skagit County | 35,607 | 44.7% | 4,132 | 28,810 | 4 |
| Clallam County | 29,496 | 23% | 3,282 | 24,426 | 11 |
| Cowlitz County | 28,987 | 66.7% | 4,939 | 21,762 | 4 |
| Island County | 26,962 | 41.4% | 1,953 | 22,640 | 1 |
| Lewis County | 23,100 | 55.5% | 3,821 | 17,779 | 11 |
| Grays Harbor County | 22,567 | 25.1% | 4,154 | 17,438 | 12 |
| Chelan County | 19,965 | 39.4% | 2,728 | 16,291 | 5 |
| Grant County | 18,089 | 35.2% | 3,466 | 14,393 | 10 |
| Walla Walla County | 14,787 | 32.7% | 2,139 | 12,073 | 2 |
| Franklin County | 12,549 | 35.3% | 2,422 | 9,857 | 3 |
| Kittitas County | 10,634 | 27.2% | 1,236 | 7,691 | 4 |
| Whitman County | 7,022 | 28.4% | 985 | 5,456 | 1 |
Statewide, 49.2% 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 timing. Washington is one of the most flexible Medigap states in the country: once you have held a policy for 90 days, you can switch to a plan with equal or lesser benefits at any time of year, from any insurer, with no medical underwriting (RCW 48.66.045), though the state does not require insurers to offer Medigap to under-65 beneficiaries who qualify through disability. About 8.5% of Washington seniors live below the poverty line, the group most likely to qualify for unclaimed help: federal Extra Help and the Medicare Savings Programs, which the Health Care Authority runs with an income test and no asset test (Washington has no income-based state drug program). For the full rundown, sources included, see our Washington patient advocacy hub.
One dedicated advocate for the bills, appeals, appointments, and paperwork, serving every Washington county virtually, usually at $0 with Medicare.
Or start from your city: every Washington city we serve.
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Read moreSources: 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 2026-08-18. Understood Care is an independent private advocacy service, not a government agency.