The 2010 United States Census[11] reported that Gardena had a population of 58,829. The population density was 10,030.0 people per square mile (3,872.6/km²). The racial makeup of Gardena was 14,498 (24.6%) White, 14,352 (24.4%) African American, 348 (0.6%) Native American, 15,400 (26.2%) Asian, 426 (0.7%) Pacific Islander, 11,136 (18.9%) from other races, and 2,669 (4.5%) from two or more races. Hispanic or Latino of any race were 22,151 persons (37.7%).
The Census reported that 58,035 people (98.7% of the population) lived in households, 122 (0.2%) lived in non-institutionalized group quarters, and 672 (1.1%) were institutionalized.
There were 20,558 households, out of which 7,199 (35.0%) had children under the age of 18 living in them, 8,782 (42.7%) were opposite-sex married couples living together, 3,931 (19.1%) had a female householder with no husband present, 1,486 (7.2%) had a male householder with no wife present. There were 1,085 (5.3%) unmarried opposite-sex partnerships, and 104 (0.5%) same-sex married couples or partnerships. 5,142 households (25.0%) were made up of individuals and 1,921 (9.3%) had someone living alone who was 65 years of age or older. The average household size was 2.82. There were 14,199 families (69.1% of all households); the average family size was 3.39.
The population was spread out with 13,410 people (22.8%) under the age of 18, 5,353 people (9.1%) aged 18 to 24, 16,656 people (28.3%) aged 25 to 44, 15,086 people (25.6%) aged 45 to 64, and 8,324 people (14.1%) who were 65 years of age or older. The median age was 37.9 years. For every 100 females there were 92.6 males. For every 100 females age 18 and over, there were 89.8 males.
There were 21,472 housing units at an average density of 3,660.8 per square mile (1,413.5/km²), of which 9,852 (47.9%) were owner-occupied, and 10,706 (52.1%) were occupied by renters. The homeowner vacancy rate was 1.3%; the rental vacancy rate was 4.6%. 28,585 people (48.6% of the population) lived in owner-occupied housing units and 29,450 people (50.1%) lived in rental housing units.