usage is an increasing challenge, and will become worse due to sea level rise. Starting in 2016, local environmental groups began dune and beach restoration projects. Demographics 2010 The 2010 United States Census reported Santa Monica had a population of 89,736. The population density was . The racial makeup of Santa Monica was 69,663 (77.6%) White (70.1% Non-Hispanic White), 3,526 (3.9%) African American, 338 (0.4%) Native American, 8,053 (9.0%) Asian, 124 (0.1%) Pacific Islander, 4,047 (4.5%) from other races, and 3,985 (4.4%) from two or more races. Hispanic or Latino of any race were 11,716 persons (13.1%), with Mexican Americans, Spanish Americans, and Argentine Americans making up 64.2%, 6.4%, and 4.7% of the Hispanic population respectively. The Census reported 87,610 people (97.6% of the population) lived in households, 1,299 (1.4%) lived in non-institutionalized group quarters, and 827 (0.9%) were institutionalized. There were 46,917 households, out of which 7,835 (16.7%) had children under the age of 18 living in them, 13,092 (27.9%) were opposite-sex married couples living together, 3,510 (7.5%) had a female householder with no husband present, 1,327 (2.8%) had a male householder with no wife present. There were 2,867 (6.1%) unmarried opposite-sex partnerships, and 416 (0.9%) same-sex married couples or partnerships. 22,716 households (48.4%) were made up of individuals, and 5,551 (11.8%) had someone living alone who was 65 years of age or older. The average household size was 1.87. There were 17,929 families (38.2% of all households); the average family size was 2.79. The population was spread out, with 12,580 people (14.0%) under the age of 18, 6,442 people (7.2%) aged 18 to 24, 32,552 people (36.3%) aged 25 to 44, 24,746 people (27.6%) aged 45 to 64, and 13,416 people (15.0%) who were 65 years of age or older. The median age was 40.4 years. For every 100 females, there were 93.2 males. For every 100 females age 18 and over, there were 91.2 males. There were 50,912 housing units at an average density of , of which 13,315 (28.4%) were owner-occupied, and 33,602 (71.6%) were occupied by renters. The homeowner vacancy rate was 1.1%; the rental vacancy rate was 5.1%. 30,067 people (33.5% of the population) lived in owner-occupied housing units and 57,543 people (64.1%) lived in rental housing units. According to the 2010 United States Census, Santa Monica had a median household income of $73,649, with 11.2% of the population living below the federal poverty