Brooklyn (NYC borough) is 6.6 times larger than Berkeley, California.
Area: 27 km2 calculated
Population: 115,403 (2012)
Berkeley is a city on the east shore of San Francisco Bay in northern Alameda County, California, that is named after the eighteenth-century bishop and philosopher George Berkeley. Wikipedia
Area: 180 km2 calculated
Population: 2,565,635 (2012)
Brooklyn is the most populous of New York City's five boroughs, with about 2.6 million people, as well as the second-largest in area. Wikipedia