According to the U.S. Census Bureau, the county has a total area of 1,228 km² (474 mi²). 1,224 km² (473 mi²) of it is land and 4 km² (1 mi²) of it is water. The total area is 0.30% water.
As of the census2 of 2000, there are 86,320 people, 31,121 households, and 24,461 families residing in the county. The population density is 71/km² (183/mi²). There are 32,196 housing units at an average density of 26/km² (68/mi²). The racial makeup of the county is 88.32% White, 9.34% Black or African American, 0.33% Native American, 0.79% Asian, 0.01% Pacific Islander, 0.37% from other races, and 0.83% from two or more races. 0.98% of the population are Hispanic or Latino of any race.
There are 31,121 households out of which 39.50% have children under the age of 18 living with them, 66.40% are married couples living together, 9.30% have a female householder with no husband present, and 21.40% are non-families. 17.70% of all households are made up of individuals and 6.80% have someone living alone who is 65 years of age or older. The average household size is 2.71 and the average family size is 3.07.
In the county, the population is spread out with 27.10% under the age of 18, 6.90% from 18 to 24, 30.70% from 25 to 44, 24.80% from 45 to 64, and 10.60% who are 65 years of age or older. The median age is 37 years. For every 100 females there are 96.90 males. For every 100 females age 18 and over, there are 92.80 males.
The median income for a household in the county is $59,223, and the median income for a family is $65,809. Males have a median income of $42,523 versus $30,689 for females. The per capita income for the county is $25,120. 3.60% of the population and 2.50% of families are below the poverty line. Out of the total people living in poverty, 3.90% are under the age of 18 and 5.80% are 65 or older.