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Marin County, California locator map According to the United States Census Bureau, Mill Valley is a City that is located in Marin County, California at 37.91 degrees North and 122.55 degrees West.  The city's time zone is America/Los Angeles, and the city's primary telephone area code is 415.  The land area of Mill Valley is about 4.76 square miles, whereas the water area of the city is about 0.08 square miles.  Marin County's land area is about 520 square miles, so the city occupies about 0.9 percent of the county's total land area.

The Census Bureau estimates that Mill Valley had about 14,355 residents in 2017, which is approximately 3,016 people per square mile of land area. 

According to recent American Community Survey data, Mill Valley had 5,975 total estimated households and the median household income was about $132,192 per year. 

The California counties map at upper right shows Marin County, highlighted in red.  Use the menu below to display interactive maps of Mill Valley, either in a frame on this page or in full-screen mode. 

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