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The 2000 Census showed that Alameda County had a population of 1,443,741 people. This represented 4.26% of the total population of California, making it the state's 7th most populous county (out of 58 counties).

From the Census Estimates for 2009<1>, Alameda had a population of 1,491,482 people. This is an increase of 3.31% 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
20101,510,271+4.61%+1.26% since 2009
20091,491,482+3.31%+1.44% since 2008
20081,470,326+1.84%+1.47% since 2007
20071,449,020+0.37%+0.75% since 2006
20061,438,193-0.38%+0.12% since 2005
20051,436,453-0.5%-0.37% since 2004
20041,441,781-0.14%-0.63% since 2003
20031,450,968+0.5%-0.66% since 2002
20021,460,576+1.17%-0.57% since 2001
20011,468,918+1.74%+1.74% since 2000
20001,443,741The Last Census

Alameda County had 540,183 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Alameda County has a total area<3> of 821 square miles [2,126 km²]. Of this total, 737 square miles [1,910 km²] of the area is land, with the balance (10.18%) being water (83.6 square miles [216.5 km²]).

Using the above population and land area values, Alameda County had a population density of 1,957 people per square mile [755 people/km²], making it the state's 4th most densely populated county (out of 58 counties).

US Census QuickFacts

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

Click here for the Alameda County QuickFact (QF-06001).

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

(2009 Est)
(2000 Census)
Change in
San LeandroQF-066808478,62279,452-1.04%
Union CityQF-068120472,85066,8698.94%

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

(2009 Est.)
(2000 Census)
Change in
Contra CostaQF-06013   N1,041,274948,8169.74%
San FranciscoQF-06075   W815,358776,7334.97%
San JoaquinQF-06077   E674,860563,59819.74%
San MateoQF-06081   SW718,989707,1611.67%
Santa ClaraQF-06085   S1,784,6421,682,5856.07%
StanislausQF-06099   E510,385446,99714.18%

The western boundary of the county is on San Francisco Bay.

Other Roadside Stops ...

About California

Cities, Towns and Villages of California

Off-the-Road Links ...

U.S. Census Bureau
Census QuickFact for Alameda 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 Alameda. 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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