According to the United States Census Bureau, the city has a total area of 2,264.5 km² (874.3 mi²). 1,962.4 km² (757.7 mi²) of it is land and 302.1 km² (116.7 mi²) of it is water. The total area is 13.34% water.
As of the census of 2000, there are 735,617 people, 284,499 households, and 190,614 families residing in the city. The population density is 374.9/km² (970.9/mi²). There are 308,826 housing units at an average density of 157.4/km² (407.6/mi²). The racial makeup of the city is 64.48% White, 29.03% African American, 0.34% Native American, 2.78% Asian, 0.06% Pacific Islander, 1.33% from other races, and 1.99% from two or more races. 4.16% of the population are Hispanic or Latino of any race.
There are 284,499 households out of which 33.9% have children under the age of 18 living with them, 46.7% are married couples living together, 16.0% have a female householder with no husband present, and 33.0% are non-families. 26.2% of all households are made up of individuals and 7.7% have someone living alone who is 65 years of age or older. The average household size is 2.53 and the average family size is 3.07.
In the city, the population is spread out with 26.7% under the age of 18, 9.7% from 18 to 24, 32.3% from 25 to 44, 21.0% from 45 to 64, and 10.3% who are 65 years of age or older. The median age is 34 years. For every 100 females there are 93.9 males. For every 100 females age 18 and over, there are 90.6 males.
The median income for a household in the city is $40,316, and the median income for a family is $47,243. Males have a median income of $32,547 versus $25,886 for females. The per capita income for the city is $20,337. 12.2% of the population and 9.4% of families are below the poverty line. Out of the total people living in poverty, 16.7% are under the age of 18 and 12.0% are 65 or older.
See also: Orange Park