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The 2000 Census showed that Snohomish County had a population of 606,024 people. This represented 10.28% of the total population of Washington, making it the state's 3rd most populous county (out of 39 counties).

From the Census Estimates for 2009<1>, Snohomish had a population of 694,571 people. This is an increase of 14.61% since the 2000 Census.

The following table shows the recent changes in population. Other than 2000, the population counts have been estimated by the Census Bureau.

Since 2000
Year-to-Year Change
2010713,335+17.71%+2.7% since 2009
2009694,571+14.61%+1.35% since 2008
2008685,296+13.08%+1.4% since 2007
2007675,805+11.51%+1.83% since 2006
2006663,645+9.51%+2.22% since 2005
2005649,229+7.13%+1.53% since 2004
2004639,440+5.51%+1.03% since 2003
2003632,925+4.44%+0.52% since 2002
2002629,671+3.9%+1.37% since 2001
2001621,144+2.49%+2.49% since 2000
2000606,024The Last Census

Snohomish County had 236,205 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Snohomish County has a total area<3> of 2,196 square miles [5,688 km²]. Of this total, 2,089 square miles [5,410 km²] of the area is land, with the balance (4.89%) being water (107.3 square miles [278 km²]).

Using the above population and land area values, Snohomish County had a population density of 290.1 people per square mile [112 people/km²], making it the state's 6th most densely populated county (out of 39 counties).

US Census QuickFacts

The Census Bureau has created documents containing demographic information that are called QuickFacts. A QuickFact that is specific to Snohomish County is available. The QuickFact also contains a comparison between Snohomish and the state of Washington.

Click here for the Snohomish County QuickFact (QF-53061).

Below are some of the communities that are located in Snohomish County:

(2009 Est)
(2000 Census)
Change in
Mountlake TerraceQF-534749020,07820,362-1.39%
Mill CreekQF-534586517,37011,52550.72%
Lake StevensQF-533790014,5116,361128.12%

Below are the counties that adjoin and form the boundaries of Snohomish County. A link to their specific Census QuickFact has been provided.

(2009 Est.)
(2000 Census)
Change in
ChelanQF-53007   E72,37266,6168.64%
IslandQF-53029   NW81,05471,55813.27%
KingQF-53033   S1,916,4411,737,03410.33%
SkagitQF-53057   N119,534102,97916.08%

The western boundary of the county is on Pudget Sound.

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U.S. Census Bureau
Census QuickFact for Snohomish County

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2000 Census and the next count will be for the 2010 Census.

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<2>A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).

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<3>The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Snohomish. The value given by the Census Bureau reflects their statistical (or sampling) requirements.

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<4>All Quarter-dollar coin images from the United States Mint.

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