San Francisco is the cultural, commercial, and financial center of Northern California and the only consolidated city-county in California.
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Area:
• City and county 231.89 sq mi (600.6 km2)
• Land 46.87 sq mi (121.4 km2)
• Water 185.02 sq mi (479.2 km2) 80.00%
• Metro 3,524.4 sq mi (9,128 km2)
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References:
https://en.wikipedia.org/wiki/San_Francisco
http://sfgov.org/
http://www.sanfrancisco.com/