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The Commemorative
Quarter for
The Commemorative Quarter for California

The 2000 Census showed that Marin County had a population of 247,289 people. This represented 0.73% of the total population of California, making it the state's 24th most populous county (out of 58 counties).

From the Census Estimates for 2009<1>, Marin had a population of 250,750 people. This is an increase of 1.4% 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
2010252,409+2.07%+0.66% since 2009
2009250,750+1.4%+0.97% since 2008
2008248,345+0.43%+0.91% since 2007
2007246,100-0.48%+0.72% since 2006
2006244,336-1.19%+0.13% since 2005
2005244,024-1.32%+0.14% since 2004
2004243,677-1.46%-0.55% since 2003
2003245,030-0.91%-0.53% since 2002
2002246,332-0.39%-0.66% since 2001
2001247,958+0.27%+0.27% since 2000
2000247,289The Last Census

Marin County had 104,990 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Marin County has a total area<3> of 828 square miles [2,145 km²]. Of this total, 519 square miles [1,346 km²] of the area is land, with the balance (37.24%) being water (308.4 square miles [798 km²]).

Using the above population and land area values, Marin County had a population density of 475.7 people per square mile [183.7 people/km²], making it the state's 12th 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 Marin County is available. The QuickFact also contains a comparison between Marin and the state of California.

Click here for the Marin County QuickFact (QF-06041).

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

(2009 Est)
(2000 Census)
Change in
San RafaelQF-066836455,90256,063-0.29%
Mill ValleyQF-064771013,40413,600-1.44%
San AnselmoQF-066443412,05812,378-2.59%
Corte MaderaQF-06164629,2899,1002.08%

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

(2009 Est.)
(2000 Census)
Change in
Contra CostaQF-06013   E1,041,274948,8169.74%
San FranciscoQF-06075   SE815,358776,7334.97%
SonomaQF-06097   N472,102458,6142.94%

The western boundary of the county is on the Pacific Ocean and San Francisco Bay is to the southeast.

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U.S. Census Bureau
Census QuickFact for Marin 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 Marin. 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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