History: Boston In The 1970s

2009 - 645,169 - 9.5%
According to the 2000 United States Census, there were 589,141 people, 239,528 households, and 115,212 families residing in the city. The population density was 12,166 people per square mile (4,697/km²). There were 251,935 housing units at an average density of 5,203 per square mile (2,009/km²). The 2009 U.S. Census population estimate for the city is 645,169, a 9.5% increase from 2000. During weekdays, the population of Boston can grow during the daytime to over 1.2 million, and can reach as many as 2 million during special events. This fluctuation of people is caused by hundreds of thousands of suburban residents who travel to the city for work, education, health care, and special events.
In the city, the population was spread out with 19.8% under the age of 18, 16.2% from 18 to 24, 35.8% from 25 to 44, 17.8% from 45 to 64, and 10.4% who were 65 years of age or older. The median age was 31 years. For every 100 females, there were 92.8 males. For every 100 females age 18 and over, there were 90.2 males. There were 239,528 households, of which 22.7% had children under the age of 18 living in them, 27.4% were married couples living together, 16.4% had a female householder with no husband present, and 51.9% were non-families. 37.1% of all households were made up of individuals and 9.1% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 3.17.