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Alameda County, California locator map According to the United States Census Bureau, Berkeley is a City that is located in Alameda County, California at 37.87 degrees North and 122.27 degrees West.  The city's time zone is America/Los Angeles, and the city's primary telephone area code is 510.  The land area of Berkeley is about 10.47 square miles, whereas the water area of the city is about 7.23 square miles.  Alameda County's land area is about 739 square miles, so the city occupies about 1.4 percent of the county's total land area.

The Census Bureau estimates that Berkeley had about 122,324 residents in 2017, which is approximately 11,683 people per square mile of land area. 

According to recent American Community Survey data, Berkeley had 45,569 total estimated households and the median household income was about $65,283 per year. 

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

Use the menu below to display categorized Berkeley directories. 

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* Parenthesized numbers indicate economic activity levels.

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