GREAT RIVERS BHO
Cowlitz
Grays Harbor
Lewis
Pacific
Wahkiakum
GREATER COLUMBIA BHO
Asotin
Benton
Columbia
Franklin
Garfield
Kittitas
Klickitat
Walla Walla
Whitman
Yakima
SPOKANE COUNTY REGIONAL BHO
Adams
Ferry
Lincoln
Okanogan
Pend Orielle
Spokane
Stevens
NORTH SOUND BHO
Island
San Juan
Snohomish
Skagit
Whatcom
OPTUM PIERCE BHO
Pierce
SALISH BHO
Clallam
Jefferson
Kitsap
SOUTHWEST WASHINGTON RSA
Clark
Skamania
NORTH CENTRAL BHO
Chelan
Douglas
Grant
KING COUNTY BHO
King
THURSTON-MASON-BHO
Mason
Thurston