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The 2000 Census showed that Lewis County had a population of 68,600 people. This represented 1.16% of the total population of Washington, making it the state's 15th most populous county (out of 39 counties).

From the Census Estimates for 2009<1>, Lewis had a population of 74,741 people. This is an increase of 8.95% 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
201075,455+9.99%+0.96% since 2009
200974,741+8.95%+0.51% since 2008
200874,362+8.4%+0.9% since 2007
200773,699+7.43%+1.19% since 2006
200672,833+6.17%+1.64% since 2005
200571,661+4.46%+1.33% since 2004
200470,722+3.09%+0.82% since 2003
200370,146+2.25%+1.15% since 2002
200269,349+1.09%+0.65% since 2001
200168,899+0.44%+0.44% since 2000
200068,600The Last Census

Lewis County had 29,585 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Lewis County has a total area<3> of 2,436 square miles [6,309 km²]. Of this total, 2,407 square miles [6,235 km²] of the area is land, with the balance (1.18%) being water (28.63 square miles [74.1 km²]).

Using the above population and land area values, Lewis County had a population density of 28.49 people per square mile [11 people/km²], making it the state's 21st 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 Lewis County is available. The QuickFact also contains a comparison between Lewis and the state of Washington.

Click here for the Lewis County QuickFact (QF-53041).

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

(2009 Est)
(2000 Census)
Change in

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

(2009 Est.)
(2000 Census)
Change in
CowlitzQF-53015   S101,96692,9489.7%
Grays HarborQF-53027   NW71,79767,1946.85%
PacificQF-53049   W21,27220,9841.37%
PierceQF-53053   N796,836700,82013.7%
SkamaniaQF-53059   SE10,8949,87210.35%
ThurstonQF-53067   N250,979207,35521.04%
WahkiakumQF-53069   SW4,0623,8246.22%
YakimaQF-53077   E239,054222,5817.4%

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U.S. Census Bureau
Census QuickFact for Lewis 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 Lewis. 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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