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Oso is a census-designated place in Snohomish County, Washington, United States.

Municipalities and communities of Snohomish County, Washington, United States
County seat: Everett
Cities	Arlington Bothell‡ Brier Edmonds Everett Gold Bar Granite Falls Lake Stevens Lynnwood Marysville Mill Creek Monroe Mountlake Terrace Mukilteo Snohomish Stanwood Sultan Woodway	Map of Washington highlighting Snohomish County
Towns	Darrington Index
CDPs	Alderwood Manor Arlington Heights Bothell East Bothell West Bryant Bunk Foss Canyon Creek Cathcart Cavalero Chain Lake Clearview Eastmont Esperance Fobes Hill Hat Island High Bridge Kayak Point Lake Bosworth Lake Cassidy Lake Goodwin Lake Ketchum Lake Roesiger Lake Stickney Larch Way Lochsloy Machias Maltby Martha Lake May Creek Meadowdale Mill Creek East Monroe North North Lynnwood North Marysville North Sultan Northwest Stanwood Oso Picnic Point Silvana Silver Firs Sisco Heights Startup Sunday Lake Swede Heaven Three Lakes Verlot Warm Beach Woods Creek
Other communities	Florence Fortson Getchell Hazel North Creek North Lakewood Reiter Robe Silverton Sisco Smokey Point Trafton
Indian reservations	Sauk-Suiattle Stillaguamish Tulalip Cathan John Sam Lake Priest Point Quil Ceda Village Shaker Church Stimson Crossing Tulalip Bay Weallup Lake
Military bases	Naval Station Everett
Ghost town	Galena Mineral City (Silver City) Monte Cristo
Footnotes	‡This populated place also has portions in an adjacent county or counties