As of the 2000 censusGeographic references#2 sq, there were 455,466 people living in Jefferson Parish. Population History :Census 2000 -- 455,466 :Census 1990 -- 448,306 :Census 1980 -- 454,592 :Census 1970 -- 337,568 :Census 1960 -- 208,769 :Census 1950 -- 103,873 Other 2000 statistics: There were 120,191 families residing in the parish. The population density was 574/km sq (1,486/mi sq). There were 187,907 housing units at an average density of 237/km sq (613/mi sq). The racial makeup of the parish was 69.82% Race (United States Census)White, 22.86% Race (United States Census)Black or Race (United States Census)African American, 0.45% Race (United States Census)Native American, 3.09% Race (United States Census)Asian, 0.03% Race (United States Census)Pacific Islander, 2.03% from Race (United States Census)other races, and 1.72% from two or more races. 7.12% of the population were Race (United States Census)Hispanic or Race (United States Census)Latino of any race. There were 176,234 households out of which 31.90% had children under the age of 18 living with them, 48.20% were Marriagemarried couples living together, 15.40% had a female householder with no husband present, and 31.80% were non-families. 26.70% of all households were made up of individuals and 8.40% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 3.13. In the parish the population was spread out with 25.30% under the age of 18, 9.10% from 18 to 24, 30.20% from 25 to 44, 23.40% from 45 to 64, and 11.90% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 92.40 males. For every 100 females age 18 and over, there were 88.60 males. The median income for a household in the parish was $38,435, and the median income for a family was $45,834. Males had a median income of $35,081 versus $24,921 for females. The per capita income for the parish was $19,953. About 10.80% of families and 13.70% of the population were below the poverty line, including 20.00% of those under age 18 and 9.80% of those age 65 or over. Source: http://en.wikipedia.org/wiki/Jefferson_Parish%2C_Louisiana