According to the U.S. Census Bureau, the county has a total area of 778 km² (300 mi²). 775 km² (299 mi²) of it is land and 3 km² (1 mi²) of it is water. The total area is 0.37% water.
There are 22,171 households out of which 39.00% have children under the age of 18 living with them, 65.40% are married couples living together, 10.40% have a female householder with no husband present, and 20.00% are non-families. 16.40% of all households are made up of individuals and 5.40% have someone living alone who is 65 years of age or older. The average household size is 2.75 and the average family size is 3.07.
In the county the population is spread out with 27.20% under the age of 18, 8.60% from 18 to 24, 32.70% from 25 to 44, 23.70% from 45 to 64, and 7.80% who are 65 years of age or older. The median age is 34 years. For every 100 females there are 98.90 males. For every 100 females age 18 and over, there are 97.20 males.
The median income for a household in the county is $45,106, and the median income for a family is $49,481. Males have a median income of $35,851 versus $24,098 for females. The per capita income for the county is $18,339. 7.90% of the population and 6.20% of families are below the poverty line. Out of the total people living in poverty, 11.40% are under the age of 18 and 7.60% are 65 or older.
