Museums
- Blackman House Museum – Snohomish City
- Edmonds-South Snohomish County Museum
- Everett Museum of History
- Granite Falls Museum
- Historic Everett
- Index-Pickett Historical Museum
- Monroe Historical Society Museum
- Mukilteo Lighthouse Museum
- Stanwood Area History Museum
- Stillaguamish Valley Pioneer Museum – Arlington
- The Flying Heritage Collection and Combat Armor Museum
- The Historic Flight Foundation at Paine Field
- Western Heritage Center, Evergreen State Fairgrounds`
- Woodinville Heritage Museum
- Verlot Service Center & Ranger Station Museum
Historical Organizations
- Darrington Historical Society
- Edmonds-South Snohomish County Historical Society
- Granite Falls Historical Society
- Hibulb Cultural Center & Natural History Preserve (Tulalip Tribe, Tulalip, WA)
- Index Historical Society
- Lake Stevens Historical Society
- League of Snohomish County Heritage Organizations
- Lynnwood Alderwood Manor Heritage Assn
- Marysville Historical Society
- Monroe Historical Society
- Monte Cristo Historic Preservation Assn
- Mukilteo Historical Society
- Sky Valley Antique Tractor Club
- Sky Valley Historical Society
- Snohomish Historical Society
- Stanwood Area Historical Society
- Woodinville Heritage Society
Historical Sites
- Everett Library’s Listing of Snohomish County Historic Sites
- Future of Flight Aviation Center & Boeing Tour
- Northwest Heritage Resources
- WA State Archaeology & Historic Preservation
- Washington State Historical Society
- Washington State History Museum (Tacoma)
- Online Encyclopedia of Washington State History
Heritage Events & Education and Activities,