what county is sacramento located in?
Sacramento County
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 San Francisco ( / sæn frənˈsɪskoʊ / ) , officially the City and County of San Francisco , is the cultural , commercial , and financial center of Northern California and the only consolidated city @-@ county in California . San Francisco encompasses a land area of about 46 @.@ 9 square miles ( 121 km2 ) on the northern end of the San Francisco Peninsula , which makes it the smallest county in the state . It has a density of about 18 @,@ 451 people per square mile ( 7 @,@ 124 people per km2 ) , making it the most densely settled large city ( population greater than 200 @,@ 000 ) in the state of California and the second @-@ most densely populated major city in the United States after New York City . San Francisco is the fourth @-@ most populous city in California , after Los Angeles , San Diego , and San Jose , and the 13th @-@ most populous city in the United States — with a Census @-@ estimated 2015 population of 864 @,@ 816 . The city and its surrounding areas are known as the San Francisco Bay Area , and are a part of the larger OMB @-@ designated San Jose @-@ San Francisco @-@ Oakland combined statistical area , the fifth most populous in the nation with an estimated population of 8 @.@ 7 million . 

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 San Francisco — officially known as the City and County of San Francisco — is a consolidated city @-@ county , a status it has held since the 1856 secession of what is now San Mateo County . It is the only such consolidation in California . The mayor is also the county executive , and the county Board of Supervisors acts as the city council . The government of San Francisco is a charter city and is constituted of two co @-@ equal branches . The executive branch is headed by the mayor and includes other citywide elected and appointed officials as well as the civil service . The 11 @-@ member Board of Supervisors , the legislative branch , is headed by a president and is responsible for passing laws and budgets , though San Franciscans also make use of direct ballot initiatives to pass legislation . 

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 California ( 2016 ) 

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 The city is also a landing point on three fiber optic cable systems linking the United States across the Pacific Ocean : C2C , Southern Cross Cable , and VSNL Transpacific . These cable landings , lower energy costs , and tax breaks led to a boom of data centers being built starting about 2010 . Data centers include those for Adobe , NetApp , Umpqua Bank , OHSU , and Fortune Data Centers . 

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 A few months after this , Gadsden and 1 @,@ 200 potential settlers from South Carolina and Florida submitted a petition to the California legislature for permanent citizenship and permission to establish a rural district that would be farmed by " not less than Two Thousand of their African Domestics . " The petition stimulated some debate , but it finally died in committee . 
