As of the 2010 census, there are 583,776 people residing in the city, organized into 235,508 households. The population density is 4,375.2 people per square mile. There are 265,439 housing units at an average density of 1989.4 per square mile (1,236.3/km²). Population growth in Portland increased 10.3% between 2000 and 2010. Population growth in the Portland metropolitan area has outpaced the national average during the last decade, and this is expected to continue over the next 50 years.
Out of 223,737 households, 24.5% have children under the age of 18 living with them, 38.1% are married couples living together, 10.8% have a female householder with no husband present, and 47.1% are non-families. 34.6% of all households are made up of individuals and 9% have someone living alone who is 65 years of age or older. The average household size is 2.3 and the average family size is 3. The age distribution was 21.1% under the age of 18, 10.3% from 18 to 24, 34.7% from 25 to 44, 22.4% from 45 to 64, and 11.6% who are 65 years of age or older. The median age is 35 years. For every 100 females there are 97.8 males. For every 100 females age 18 and over, there are 95.9 males.