King William County is named for King William III of Great Britain.
Surrounding County Courthouses:
N – Caroline County and King and Queen County
E – New Kent County
S – New Kent County and Hanover County
W – Caroline County
Created: December 1, 1700 
County Seat:
King William 1702 – present
County Courthouse – King William
Location: 227 Courthouse Lane / Horse Landing Road
Built: 1725 – 1726
Style: Georgian
Architect: Unknown
Contractor: Unknown
Description: The building faces south and is a one story red colored brick laid in Flemish bond and wood structure. The building is “T” shaped. The south front has five arches along the arcade. The recessed entrance is framed with white colored wood and with a small pediment above. The building has a steep hipped. In 1840, the building was enlarged with a unique stile and brick wall to enclose the court green.
Note: The courthouse is the oldest courthouse still in use in the United States. The second oldest courthouses is located in Salem County, New Jersey (1735). The third oldest is in Hanover County, Virginia (1737). The fourth oldest is in Charles City County, Virginia (1740). The fifth oldest is in Richmond County, Virginia (1748).
See: The 9th Judicial Circuit includes Charles City County, Gloucester County, James City County, King and Queen County, Mathews County, Middlesex County, New Kent County, Poquoson, Williamsburg and York County.
County Administration Building – King William
Location: 180 Horse Landing Road / Courthouse Lane
Built: 1977 – 1978
Style: Modern
Architect: H C Johnson, Jr.
Contractor: Hammond Brothers.
Description: The building faces south and is a one story red colored brick and concrete structure. The south front has a small canopy at the central entrance. Red colored brick is broken by concrete framed windows. The roof line is flat.
County Courthouse - King William
Photos taken 2013