all rain (snow is extremely rare at sea level in the San Francisco Bay Area). Hazards The low-lying island has seen sea-level and groundwater level rise threaten its infrastructure and people not just through flooding events, but through the increased liquefaction risk from more saturated soils. The locations of increasing groundwater-induced risks and flooding risks (such as from another megaflood) may be most precise in private insurance company maps. Demographics 2010 The 2010 United States Census reported that Alameda had a population of 73,812. (2015 census estimates place the population at 78,630) The population density was . The racial makeup of Alameda was 37,460 (50.8%) White, 23,058 (31.2%) Asian, 4,759 (6.4%) African American, 426 (0.6%) Native American, 381 (0.5%) Pacific Islander, 2,463 (3.3%) from other races, and 5,265 (7.1%) from two or more races. Hispanic or Latino of any race were 8,092 persons (11.0%). The Census reported that 72,316 people (98.0% of the population) lived in households, 857 (1.2%) lived in non-institutionalized group quarters, and 639 (0.9%) were institutionalized. There were 30,123 households, out of which 9,144 (30.4%) had children under the age of 18 living in them, 13,440 (44.6%) were opposite-sex married couples living together, 3,623 (12.0%) had a female householder with no husband present, 1,228 (4.1%) had a male householder with no wife present. There were 1,681 (5.6%) unmarried opposite-sex partnerships, and 459 (1.5%) same-sex married couples or same-sex partnerships. 9,347 households (31.0%) were made up of individuals, and 2,874 (9.5%) had someone living alone who was 65 years of age or older. The average household size was 2.40. There were 18,291 families (60.7% of all households); the average family size was 3.06. The age distribution of the population shows 15,304 people (20.7%) under the age of 18, 5,489 people (7.4%) aged 18 to 24, 21,000 people (28.5%) aged 25 to 44, 22,044 people (29.9%) aged 45 to 64, and 9,975 people (13.5%) who were 65 years of age or older. The median age was 40.7 years. For every 100 females, there were 91.7 males. For every 100 females age 18 and over, there were 88.5 males. Per capita annual income (in 2013 dollars) in 2009–2013 was $41,340 per the US Census. Median household income in 2009–2013 was $74,606 per the US Census. There were 32,351 housing units at an average density of , of which 30,123 were occupied, of which 14,488 (48.1%) were owner-occupied, and 15,635 (51.9%)