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As of the census[6] of 2000, there were 52,613 people, 19,621 households, and 12,577 families residing in the city. The population density was 5,216.2 people per square mile (2,013.3/km²). There were 20,674 housing units at an average density of 2,049.7/sq mi (791.1/km²). The racial makeup of the city was 58.2% White, 15% Black or African American, 0.4% Native American, 13.8% Asian, 0.1% Pacific Islander, 8.6 from other races, and 4.4% from two or more races. 19.8% of the population were Hispanic or Latino of any race. 34.3% of Gaithersburg's population was foreign-born.
There were 19,621 households out of which 34.8% had children under the age of 18 living with them, 48.6% were married couples living together, 11.2% had a female householder with no husband present, and 35.9% were non-families. 27.8% of all households were made up of individuals and 7.2% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 3.14 the population was spread out with 25.0% under the age of 18, 9.0% from 18 to 24, 37.7% from 25 to 44, 20.0% from 45 to 64, and 8.2% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 95.1 males. For every 100 females age 18 and over, there were 92.4 males.
The median income for a household in the city was $74,883 and the median income for a family was $86,422 as of a 2007 estimate[7]. Males had a median income of $44,331 versus $35,861 for females. The per capita income for the city was $27,323. 9.1% of the population and 4.9% of families were below the poverty line. 7.2% of those under the age of 18 and 11.4% of those 65 and older were living below the poverty line.
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