King William County, Virginia

King William County is a located on the  in the  of. As of, the population is 13,146. Its is.

History
King William County was formed in out of. The county is named for,. The built in  is the oldest Courthouse in continuous use in the United States.

Geography
According to the, the county has a total area of 740 (286 ). 713 km² (275 mi²) of it is land and 26 km² (10 mi²) of it (3.58%) is water. King William County is bounded by the to the north and the  to the south. The two rivers combine to form the, at , the county's largest town.

Demographics
As of the of 2000, there were 13,146 people, 4,846 households, and 3,784 families residing in the county. The was 18/km² (48/mi²). There were 5,189 housing units at an average density of 7/km² (19/mi²). The racial makeup of the county was 73.81%, 22.81% or , 1.54% , 0.37% , 0.33% from , and 1.15% from two or more races. 0.91% of the population were or  of any race.

There were 4,846 households out of which 36.40% had children under the age of 18 living with them, 63.90% were living together, 10.20% had a female householder with no husband present, and 21.90% were non-families. 18.30% of all households were made up of individuals and 7.60% had someone living alone who was 65 years of age or older. The average household size was 2.69 and the average family size was 3.06.

In the county, the population was spread out with 26.10% under the age of 18, 5.90% from 18 to 24, 31.50% from 25 to 44, 24.80% from 45 to 64, and 11.70% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 96.90 males. For every 100 females age 18 and over, there were 93.90 males.

The median income for a household in the county was $49,876, and the median income for a family was $54,037. Males had a median income of $34,616 versus $25,578 for females. The for the county was $21,928. About 4.40% of families and 5.50% of the population were below the, including 6.00% of those under age 18 and 9.00% of those age 65 or over.