Duval County is one of 67 counties in the U.S. state of Florida and its county seat is Jacksonville, Florida6. As of 2000, the population is 778,879. According to the U.S. Census Bureau, the county has a total area of 2,378 km˛ (918 mi˛). 2,004 km˛ (774 mi˛) of it is land and 374 km˛ (145 mi˛) of it is water. The total area is 15.74% water. The topography is coastal plain however throughout the county rolling hills predominate. The hills are steep in Arlington.

As of the census2 of 2000, there are 303,747 households, and 201,688 families residing in the county. The population density is 389/km˛ (1,007/mi˛). There are 329,778 housing units at an average density of 165/km˛ (426/mi˛). The racial makeup of the county is 65.80% White, 27.83% Black or African American, 0.33% Native American, 2.71% Asian, 0.06% Pacific Islander, 1.31% from other races, and 1.96% from two or more races. 4.10% of the population are Hispanic or Latino of any race.

There are 303,747 households out of which 33.30% have children under the age of 18 living with them, 46.50% are married couples living together, 15.60% have a female householder with no husband present, and 33.60% are non-families. 26.50% of all households are made up of individuals and 7.80% have someone living alone who is 65 years of age or older. The average household size is 2.51 and the average family size is 3.06.

The median income for a household in the county is $40,703, and the median income for a family is $47,689. Males have a median income of $32,954 versus $26,015 for females. The per capita income for the county is $20,753. 11.90% of the population and 9.20% of families are below the poverty line. Out of the total population, 16.40% of those under the age of 18 and 11.60% of those 65 and older are living below the poverty line.