The 2010 United States Census reported that Downey had a population of 111,772.
The population density was 8893.3 people per square mile (3,433.7/km²).
The racial makeup of Downey was 63,255 (56.6%) White (17.7% Non-Hispanic White), 7,804 (7.0%) Asian (2.2% Korean, 2.2% Filipino, 0.6% Indian, 0.5% Chinese, 0.3% Vietnamese, 0.3% Japanese, 0.2% Thai, 0.1% Cambodian, 0.1% Pakistani), 4,329 (3.9%) African American, 820 (0.7%) Native American, 221 (0.2%) Pacific Islander, 30,797 (27.6%) from other races, and 4,546 (4.1%) from two or more races.
 Hispanic or Latino of any race were 78,996 persons (70.7%); 54.0% of Downey residents are of Mexican ancestry, 3.9% Salvadoran, 2.0% Cuban, 2.0% Guatemalan, 1.1% Peruvian, and 1.0% Nicaraguan ancestry.

The Census reported that 111,089 people (99.4% of the population) lived in households, 122 (0.1%) lived in non-institutionalized group quarters, and 561 (0.5%) were institutionalized.

There were 33,936 households, out of which 15,697 (46.3%) had children under the age of 18 living in them, 17,405 (51.3%) were opposite-sex married couples living together, 6,289 (18.5%) had a female householder with no husband present, 2,796 (8.2%) had a male householder with no wife present.
 There were 2,357 (6.9%) POSSLQ, and 225 (0.7%) same-sex married couples or partnerships.
5,721 households (16.9%) were made up of individuals, and 2,211 (6.5%) had someone living alone who was 65 years of age or older.
The average household size was 3.27.
 There were 26,490 families (78.1% of all households); the average family size was 3.68.

The population was spread out, with 29,972 people (26.8%) under the age of 18, 12,108 people (10.8%) aged 18 to 24, 33,056 people (29.6%) aged 25 to 44, 25,057 people (22.4%) aged 45 to 64, and 11,579 people (10.4%) who were 65 years of age or older.
 The median age was 33.3 years.
For every 100 females, there were 94.1 males.
 For every 100 females age 18 and over, there were 90.4 males.

There were 35,601 housing units at an average density of 2,832.7 per square mile (1,093.7/km²), of which 17,135 (50.5%) were owner-occupied, and 16,801 (49.5%) were occupied by renters.
The homeowner vacancy rate was 1.4%; the rental vacancy rate was 4.9%.
 59,555 people (53.3% of the population) lived in owner-occupied housing units and 51,534 people (46.1%) lived in rental housing units.
Approximately 30–40 homeless reside in the area.

According to the 2010 United States Census, Downey had a median household income of $60,939, with 11.8% of the population living below the federal poverty line.
The 2010 United States Census reported that Downey had a population of 111,772. The population density was 8893.3 people per square mile (3,433.7/km²). The racial makeup of Downey was 63,255 (56.6%) White (17.7% Non-Hispanic White), 7,804 (7.0%) Asian (2.2% Korean, 2.2% Filipino, 0.6% Indian, 0.5% Chinese, 0.3% Vietnamese, 0.3% Japanese, 0.2% Thai, 0.1% Cambodian, 0.1% Pakistani), 4,329 (3.9%) African American, 820 (0.7%) Native American, 221 (0.2%) Pacific Islander, 30,797 (27.6%) from other races, and 4,546 (4.1%) from two or more races.  Hispanic or Latino of any race were 78,996 persons (70.7%); 54.0% of Downey residents are of Mexican ancestry, 3.9% Salvadoran, 2.0% Cuban, 2.0% Guatemalan, 1.1% Peruvian, and 1.0% Nicaraguan ancestry.
The Census reported that 111,089 people (99.4% of the population) lived in households, 122 (0.1%) lived in non-institutionalized group quarters, and 561 (0.5%) were institutionalized.
There were 33,936 households, out of which 15,697 (46.3%) had children under the age of 18 living in them, 17,405 (51.3%) were opposite-sex married couples living together, 6,289 (18.5%) had a female householder with no husband present, 2,796 (8.2%) had a male householder with no wife present.  There were 2,357 (6.9%) POSSLQ, and 225 (0.7%) same-sex married couples or partnerships. 5,721 households (16.9%) were made up of individuals, and 2,211 (6.5%) had someone living alone who was 65 years of age or older. The average household size was 3.27.  There were 26,490 families (78.1% of all households); the average family size was 3.68.
The population was spread out, with 29,972 people (26.8%) under the age of 18, 12,108 people (10.8%) aged 18 to 24, 33,056 people (29.6%) aged 25 to 44, 25,057 people (22.4%) aged 45 to 64, and 11,579 people (10.4%) who were 65 years of age or older.  The median age was 33.3 years. For every 100 females, there were 94.1 males.  For every 100 females age 18 and over, there were 90.4 males.
There were 35,601 housing units at an average density of 2,832.7 per square mile (1,093.7/km²), of which 17,135 (50.5%) were owner-occupied, and 16,801 (49.5%) were occupied by renters. The homeowner vacancy rate was 1.4%; the rental vacancy rate was 4.9%.  59,555 people (53.3% of the population) lived in owner-occupied housing units and 51,534 people (46.1%) lived in rental housing units. Approximately 30–40 homeless reside in the area.
According to the 2010 United States Census, Downey had a median household income of $60,939, with 11.8% of the population living below the federal poverty line.
Downey, California