Snohomish County, Washington Genealogy Records

Selected record inventories for Snohomish County, their listed years, and where to ask for access.

Selected inventory review: 2026-11-02. Selected collection metadata checked against repository catalog descriptions. This is not a complete holdings audit, examination of original records, or certification of current access. See the access note for limitations. Repository catalog or holdings guide

Formed
1861
County seat
Everett
Chelan CountyClallam CountyDouglas CountyGrant CountyGrays Harbor CountyJefferson CountyKitsap CountyKittitas CountyLewis CountyMason CountyOkanogan CountyPacific CountyPierce CountySan Juan CountySkagit CountyThurston CountyWhatcom CountyYakima CountyIsland CountyKing CountySnohomish CountyChelanClallamDouglasGrantGrays HarborJeffersonKitsapKittitasMasonPierceSkagitThurstonWhatcomIslandKingSnohomish
Snohomish CountyParent counties (search here for earlier records)Today's boundaries · U.S. Census Bureau

Listed record inventories

Selected holdings and indexes for Snohomish County, checked against the repository descriptions linked below. Date spans may contain gaps; an index is not a complete set of original records.

Census records

Other records

Deeds and land

Cemeteries and burial

See the repository's descriptions and search options

Repository access note: Selected digital collection links from Washington State Library county research guides. Collections may include local towns, schools, cemeteries and other organizations within the county. Guide dates can change; consult each Digital Archives collection for actual coverage, restrictions and available images.

Sources: the catalogs and repository descriptions linked on the entries above. Selected inventories do not establish complete coverage of every record type or online access to original documents. Read the repository access note for source dates and limitations.

Where to find the records

Offices change their hours and access rules; call before you visit.

Boundaries and parent counties

Formed from: Island County, King County

Check the parent counties for earlier records: Island County, King County

Disputed Area (San Juan Islands)Non-County Area 1ClallamJeffersonWhatcomWalla WallaPierceChehalisSpokane (orig., extinct)KitsapLewisSawamishThurstonIslandKingSnohomishSnohomishIslandKingClallamJeffersonWhatcomPierceChehalisKitsapSawamishThurston
Snohomish as created in 1861Where its land was the day beforeToday's boundaryBoundaries: Newberry Library, Atlas of Historical County Boundaries

Records stay with the county that created them. If your ancestor lived here before 1861, search the parent county. The Atlas of Historical County Boundaries shows each boundary change.

Research tip

Washington began statewide registration of births and deaths in 1907. Many county marriage, birth, death and census records are indexed free in the Washington State Digital Archives.