As of the census of 2000, there were 32,986 people, 14,629 households, and 7,329 families residing in the city. The population density was 8,025.7 people per square mile (3,098.8/km²). There were 15,008 housing units at an average density of 3,651.5/sq mi (1,409.9/km²). The racial makeup of the city was 91.42% White, 1.73% African American, 0.16% Native American, 3.87% Asian, 0.02% Pacific Islander, 0.85% from other races, and 1.95% from two or more races. Hispanic or Latino of any race were 2.68% of the population.
Watertown is also a major center of the Armenian diaspora in the United States, with the third-largest Armenian community in the United States, estimated at over 8,000 as of 2007. Watertown ranks only behind the California cities of Glendale and Fresno. however the census of 2000 put the Armenian population at 2,708 or 8.2 percent.[2]
There were 14,629 households out of which 17.8% had children under the age of 18 living with them, 37.9% were married couples living together, 8.7% had a female householder with no husband present, and 49.9% were non-families. 34.1% of all households were made up of individuals and 12.4% had someone living alone who was 65 years of age or older. The average household size was 2.17 and the average family size was 2.86.
In the city the population was spread out with 14.1% under the age of 18, 9.4% from 18 to 24, 39.8% from 25 to 44, 20.0% from 45 to 64, and 16.7% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 86.1 males. For every 100 females age 18 and over, there were 83.8 males.
The median income for a household in the city was $59,764, and the median income for a family was $67,441. Males had a median income of $46,642 versus $39,840 for females. The per capita income for the city was $33,262. About 4.5% of families and 6.3% of the population were below the poverty line, including 8.6% of those under age 18 and 7.5% of those age 65 or over.
As property values within the Boston metropolitan area continue to rise, Watertown has gained in appeal as an attractive, affordable alternative to more expensive communities such as Cambridge, Brookline, Belmont, and Boston proper. Close to Soldiers Field Road and the Massachusetts Turnpike, major arteries into downtown Boston, Watertown has easy access to both Boston nightlife and more suburban communities such as Newton. Watertown Square is the terminus of several MBTA bus and trackless trolley routes. The former A-Watertown branch of the MBTA Green Line ran to Watertown until 1969.