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Jump to a region: Puget Sound · San Juan & Northwest Washington · Olympic Peninsula & coast · Southwest Washington · Yakima & Central Washington · Tri-Cities · Spokane & Inland Northwest
Plans open to everyone are Medicare Advantage plans, with or without drug coverage, that anyone with Medicare in the county can join. Source: CMS Landscape files, 2026 and 2027.
Puget Sound
The cities and suburbs around Puget Sound, from Everett to Olympia, where most Washingtonians live.
| County | Seat and largest community | Plans open to everyone | Change from 2026 | Special needs plans |
|---|---|---|---|---|
| King County | Seattle | 30 | -7 | 29 |
| Kitsap County | Port Orchard, Bremerton | 28 | -4 | 28 |
| Pierce County | Tacoma | 35 | -5 | 31 |
| Snohomish County | Everett | 31 | -11 | 29 |
| Thurston County | Olympia | 32 | -6 | 28 |
San Juan & Northwest Washington
The San Juan Islands, Whidbey Island and the Skagit and Whatcom valleys up to the Canadian border.
| County | Seat and largest community | Plans open to everyone | Change from 2026 | Special needs plans |
|---|---|---|---|---|
| Island County | Coupeville, Oak Harbor | 12 | -9 | 15 |
| San Juan County | Friday Harbor | 4 | -3 | 14 |
| Skagit County | Mount Vernon | 15 | -12 | 27 |
| Whatcom County | Bellingham | 9 | -11 | 19 |
Olympic Peninsula & coast
The Olympic Peninsula, Hood Canal and the southwest Pacific coast.
| County | Seat and largest community | Plans open to everyone | Change from 2026 | Special needs plans |
|---|---|---|---|---|
| Clallam County | Port Angeles | 1 | -8 | 13 |
| Grays Harbor County | Montesano, Aberdeen | 4 | -3 | 9 |
| Jefferson County | Port Townsend | 12 | -5 | 24 |
| Mason County | Shelton | 14 | -5 | 23 |
| Pacific County | South Bend, Long Beach | 3 | -3 | 15 |
Southwest Washington
Southwest Washington along I-5 and the Columbia River Gorge, across the river from Oregon.
| County | Seat and largest community | Plans open to everyone | Change from 2026 | Special needs plans |
|---|---|---|---|---|
| Clark County | Vancouver | 31 | -14 | 26 |
| Cowlitz County | Kelso, Longview | 21 | -11 | 21 |
| Klickitat County | Goldendale | 3 | same | 8 |
| Lewis County | Chehalis, Centralia | 19 | -2 | 26 |
| Skamania County | Stevenson | 11 | same | 19 |
| Wahkiakum County | Cathlamet | 14 | same | 20 |
Yakima & Central Washington
Central and southeastern Washington east of the Cascades: the Yakima, Wenatchee and Okanogan valleys, the Columbia Basin and the Blue Mountains.
| County | Seat and largest community | Plans open to everyone | Change from 2026 | Special needs plans |
|---|---|---|---|---|
| Adams County | Ritzville, Othello | 6 | -3 | 12 |
| Asotin County | Asotin, Clarkston | 5 | +2 | 11 |
| Chelan County | Wenatchee | 8 | -4 | 9 |
| Columbia County | Dayton | 6 | -3 | 14 |
| Douglas County | Waterville, East Wenatchee | 7 | -3 | 12 |
| Garfield County | Pomeroy | 6 | -3 | 14 |
| Grant County | Ephrata, Moses Lake | 8 | -4 | 9 |
| Kittitas County | Ellensburg | 5 | same | 15 |
| Okanogan County | Okanogan, Omak | 8 | -4 | 9 |
| Walla Walla County | Walla Walla | 9 | -6 | 16 |
| Yakima County | Yakima | 5 | -6 | 15 |
Tri-Cities
Kennewick, Richland and Pasco, where the Yakima, Snake and Columbia rivers meet.
| County | Seat and largest community | Plans open to everyone | Change from 2026 | Special needs plans |
|---|---|---|---|---|
| Benton County | Prosser, Kennewick | 9 | -6 | 18 |
| Franklin County | Pasco | 10 | -6 | 18 |
Spokane & Inland Northwest
Spokane and the forests, wheat country and river valleys of northeast Washington and the Palouse.
| County | Seat and largest community | Plans open to everyone | Change from 2026 | Special needs plans |
|---|---|---|---|---|
| Ferry County | Republic | 6 | -3 | 8 |
| Lincoln County | Davenport | 6 | same | 14 |
| Pend Oreille County | Newport | 6 | -3 | 15 |
| Spokane County | Spokane | 25 | -7 | 22 |
| Stevens County | Colville | 4 | -2 | 9 |
| Whitman County | Colfax, Pullman | 5 | +2 | 14 |
