This county is a part of the Atlanta Metropolitan Area.
Geography
According to the U.S. Census Bureau, the county has a total area of 1,131 km² (437 mi²). 1,121 km² (433 mi²) of it is land and 10 km² (4 mi²) of it is water. The total area is 0.91% water.
Demographics
As of the census2 of 2000, there are 588,448 people, 202,317 households, and 152,344 families residing in the county. The population density is 525/km² (1,360/mi²). There are 209,682 housing units at an average density of 187/km² (485/mi²). The racial makeup of the county is 72.71% White, 13.29% Black or African American, 0.28% Native American, 7.20% Asian, 0.04% Pacific Islander, 4.32% from other races, and 2.15% from two or more races. 10.90% of the population are Hispanic or Latino of any race.
There are 202,317 households out of which 42.30% have children under the age of 18 living with them, 61.20% are married couples living together, 10.00% have a female householder with no husband present, and 24.70% are non-families. 18.40% of all households are made up of individuals and 3.10% have someone living alone who is 65 years of age or older. The average household size is 2.88 and the average family size is 3.28.
In the county the population is spread out with 28.20% under the age of 18, 8.70% from 18 to 24, 37.50% from 25 to 44, 20.30% from 45 to 64, and 5.40% who are 65 years of age or older. The median age is 32 years. For every 100 females there are 101.70 males. For every 100 females age 18 and over, there are 100.10 males.
The median income for a household in the county is $60,537, and the median income for a family is $66,693. Males have a median income of $42,343 versus $31,772 for females. The per capita income for the county is $25,006. 5.70% of the population and 3.80% of families are below the poverty line. Out of the total people living in poverty, 5.90% are under the age of 18 and 5.50% are 65 or older.