Williamson County is named for Williamson County in Tennessee through the influence of emigrants from that county.
Surrounding County Courthouses:
N – Franklin County
E – Saline County
S – Johnson County and Union County
W – Jackson County
Created: February 28, 1839 
County Seat:
Marion 1839 – present
County Courthouse – Marion
Location: 200 West Jefferson Street / North Monroe Street
Built: 1969 – 1970
Style: Modern
Architect: Clark, Atley and Associates of Urbana
Contractor: Bearden Construction Company of Marion
Description: The building faces south and is a three story light brown colored brick, glass and concrete structure. The building is located on a slope with the full three stories on the north side of the building in the center of Marion. The entrance is at the west end of the south side and is recessed. A one story section extends south from the main building. The roof line is flat. An addition was added in 1984 and 1985. The architect was Lovelace and associates and the contractor was Ralph Korte of Union, Inc.
See: The cupola from the 1888 courthouse is at the top of a red colored brick pillar in the town square.
See: The 1st Judicial District includes Alexander County, Jackson County, Johnson County, Massac County, Pope County, Pulaski County, Union County.
History: The county was created in 1839 and Marion was selected as the county seat. A Clerk’s Office and jail were built in 1840. The first courthouse was a square brick structure built in 1842. The second courthouse was built in 1859. The courthouse was destroyed by the great fire of 1875. Office space was rented until the third courthouse was designed by N S Spencer & Sons and constructed by Charles E Bush in 1888. The cupola from the courthouse is at the top of a red colored brick pillar in the town square. The fourth and present courthouse was constructed in 1969 to 1970.
County Courthouse – Marion
Cupola 1888 County Courthouse
Photos taken 2008