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The 2000 Census showed that Benton County had a population of 142,475 people. This represented 2.42% of the total population of Washington, making it the state's 10th most populous county (out of 39 counties).

From the Census Estimates for 2009<1>, Benton had a population of 168,294 people. This is an increase of 18.12% 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.

YearPopulationChange
Since 2000
Year-to-Year Change
2010175,177+22.95%+4.09% since 2009
2009168,294+18.12%+2.61% since 2008
2008164,020+15.12%+2.87% since 2007
2007159,444+11.91%+1.18% since 2006
2006157,577+10.6%+0.98% since 2005
2005156,050+9.53%+1.09% since 2004
2004154,366+8.35%+1.17% since 2003
2003152,586+7.1%+1.92% since 2002
2002149,718+5.08%+2.82% since 2001
2001145,611+2.2%+2.2% since 2000
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2000142,475The Last Census

Benton County had 55,963 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Benton County has a total area<3> of 1,760 square miles [4,558 km²]. Of this total, 1,703 square miles [4,410 km²] of the area is land, with the balance (3.24%) being water (57 square miles [147.7 km²]).

Using the above population and land area values, Benton County had a population density of 83.7 people per square mile [32.3 people/km²], making it the state's 9th 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 Benton County is available. The QuickFact also contains a comparison between Benton and the state of Washington.

Click here for the Benton County QuickFact (QF-53005).

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

CommunityCensus
QuickFact
Population
(2009 Est)
Population
(2000 Census)
Change in
  Population
KennewickQF-533527567,81454,69323.99%
RichlandQF-535823547,52738,70822.78%
West RichlandQF-537766511,5208,38537.39%

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

CountyCensus
QuickFact
DirectionPopulation
(2009 Est.)
Population
(2000 Census)
Change in
Population
Morrow (OR)QF-41049   S11,53310,9954.89%
Umatilla (OR)QF-41059   SE73,34770,5483.97%
FranklinQF-53021   NE77,35549,34756.76%
GrantQF-53025   N88,09874,69817.94%
KlickitatQF-53039   W20,55419,1617.27%
Walla WallaQF-53071   E59,05955,1807.03%
YakimaQF-53077   W239,054222,5817.4%

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U.S. Census Bureau
Census QuickFact for Benton 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 Benton. 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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