San Francisco At Night, California, United States

Of all major cities, San Francisco ranks second behind Seattle for the percentage of residents with a college degree. Over 44% of adults within the city limits have a bachelor's or higher degree. USA Today reported that Rob Pitingolo, a researcher who measured college graduates per square mile, found that San Francisco had the highest rate at 7,031 per square mile, or over 344,000 total graduates in the city's 46.7 square miles (121 km2).
San Francisco ranks third of American cities in median household income with a 2007 value of $65,519. Median family income is $81,136, and San Francisco ranks 8th of major cities worldwide in the number of billionaires known to be living within city limits. Following a national trend, an emigration of middle class families is contributing to widening income disparity and has left the city with a lower proportion of children, 14.5%, than any other large American city.
The city's poverty rate is 11.8% and the number of families in poverty stands at 7.4%, both lower than the national average. The unemployment rate stands at 8.1% as of November 2011. Homelessness has been a chronic and controversial problem for San Francisco since the early 1980s. The homeless population is estimated to be 13,500 with 6,500 living on the streets. The city is believed to have the highest number of homeless inhabitants per capita of any major U.S. city. Rates of reported violent and property crimes for 2009 (736 and 4,262 incidents per 100,000 residents, respectively) are slightly lower than for similarly sized U.S. cities.