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County · code 53061

Snohomish CountyWashington

Snohomish County is a county in Washington with its seat in Everett. It was created in 1861 from Island and King counties.

  • Founded1861
  • County seatEverett
  • Named forSnohomish tribe
  • Land area2,087 sq mi + 109 sq mi water
  • Population827,957 2020 Census
  • Parcels mapped319,423 checked 16 October 2026
Open the free map Click any parcel in Snohomish County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

SkagitKingIslandKitsapChelan Everett Census outline · seat marked

Where it is

Snohomish on the map of Washington

Washington has 39 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAsotin CountyBenton CountyChelan CountyClallam CountyClark CountyColumbia CountyCowlitz CountyDouglas CountyFerry CountyFranklin CountyGarfield CountyGrant CountyGrays Harbor CountyIsland CountyJefferson CountyKing CountyKitsap CountyKittitas CountyKlickitat CountyLewis CountyLincoln CountyMason CountyOkanogan CountyPacific CountyPend Oreille CountyPierce CountySan Juan CountySkagit CountySkamania CountySpokane CountyStevens CountyThurston CountyWahkiakum CountyWalla Walla CountyWhatcom CountyWhitman CountyYakima CountySnohomish County Snohomish
Counties of Washington · Snohomish highlighted

History

Formed in 1861 from Island County and King County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Snohomish County was created on January 14, 1861, by Washington Territory from Island and King counties. Named after the Snohomish tribe, the county continued when Washington became a state in 1889.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1861
    Snohomish County created Snohomish created by Washington Territory from Island and King.
    from Islandfrom King
    · Wash. Terr. Laws 1860, 8th sess., p. 19
  2. 1867
    Boundary clarified Snohomish redefined (no change).
    no change
    · Wash. Terr. Laws 1866-1867, 14th sess., pp. 44-45
  3. 1869
    Boundary clarified Snohomish redefined (no change).
    no change
    · Wash. Terr. Laws 1869, 2nd biennial sess., sec. 1/pp. 291-292
  4. 1877
    Boundary clarified Snohomish boundaries redefined (no change).
    no change
    · Wash. Terr. Laws 1877, 6th biennial sess., pp. 425-426
  5. 1889
    Became part of Washington Snohomish continued as a Washington county when the state of Washington admitted to the Union and Washington Territory eliminated. · U.S. Stat., vol. 25, ch. 180[1889], p. 676; U.S. Stat. pres. proc., vol. 26[1889], p. 10; Van Zandt, 155-156
  6. 1938
    Boundary clarified The portion of the west line of Snohomish running through South Pass, the Sillaguamish River mouth, and Davis Slough was clarified in a court case (no change).
    no change
    · "Groeneveld v Camano Blue Oyster Co." in Wash. Rpts. 196: 54-61; Abbott, 156

Land and parcels

What the maps cover in Snohomish

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Snohomish by the Census

Population
827,957 2020 Census count
Housing units
321,523 2020 Census count
Land area
2,087 square miles
Water area
109 square miles
People per sq mi
397 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Records

Permits

Zoning and code

GIS and maps

County government

See your own lot on these maps

Open Snohomish County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Snohomish County

When was Snohomish County founded?
Snohomish County was founded in 1861, formed from Island County and King County, and named after Snohomish tribe.
What is the county seat of Snohomish County?
The county seat of Snohomish County is Everett.
Is there an online parcel map for Snohomish County?
Yes. A public source publishes a parcel map of 319,423 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Snohomish County's boundary or name changed?
Snohomish County was created in 1861 from Island County and King County. Since then the Atlas of Historical County Boundaries records 1 later change.
Who issues building permits in Snohomish County?
The county's page on building permits: Building Permits. Inside a city or town, ask that city first.
Who issues septic and well permits in Snohomish County?
The county's page on septic systems and wells: Behavioral Health and Veterans Services.
Is my lot in a flood zone?
We do not have flood maps for Snohomish County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door