As of the census of 2000, there were 13,462 people, 4,925 households, and 3,895 families residing in the county. The population density was 64 people per square mile (25/km²). There were 5,203 housing units at an average density of 25 per square mile (10/km²). The racial makeup of the county was 80.26% White, 16.20% Black or African American, 1.29% Native American, 0.53% Asian, 0.01% Pacific Islander, 0.53% from other races, and 1.17% from two or more races. 1.31% of the population were Hispanic or Latino of any race.
There were 4,925 households out of which 34.70% had children under the age of 18 living with them, 66.60% were married couples living together, 9.00% had a female householder with no husband present, and 20.90% were non-families. 16.60% of all households were made up of individuals and 5.60% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 2.97.
In the county, the population was spread out with 25.00% under the age of 18, 5.90% from 18 to 24, 32.00% from 25 to 44, 27.70% from 45 to 64, and 9.40% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 102.60 males. For every 100 females age 18 and over, there were 99.90 males.
The median income for a household in the county was $53,595, and the median income for a family was $60,678. Males had a median income of $40,005 versus $28,894 for females. The per capita income for the county was $22,893. 4.90% of the population and 3.40% of families were below the poverty line. Out of the total people living in poverty, 7.40% are under the age of 18 and 7.00% are 65 or older.
The county is crossed by the railroad tracks of CSX Transportation and Norfolk Southern, but has no passenger rail stations. The nearest Amtrak service is at stations in Williamsburg and Richmond.
New Kent Airport in the county's western end near Quinton is a General Aviation facility. Commercial passenger air service and cargo services are offered at Richmond International Airport, which is located in adjacent Henrico County, about 10 miles west of Bottoms Bridge.