The Lafayette County Courthouse is a historic courthouse in Lexington, Lafayette County, Missouri. It was built in 1847 and is the oldest courthouse in continuous use west of the Mississippi River. It is well known for the cannonball embedded in the upper left column, a remnant of the Civil War. History In 1847, County Judges Thomas Gordon, Nathaniel Price, and Joseph W. Hall determined that a new Courthouse was needed to serve Lafayette County, Missouri. The judges chose a site on the new Main Street in Lexington, an approved plans for a magnificent structure of the Classic Greek Revival design. Silas Silver, John Catron, Robert Aull, and Henderson Young served as project and contract overseers, and William Dougherty was the architect. On April 1, 1847, the plans were accepted and $12,000 was set aside for building the new structure. The final construction costs were $14,382.46. The old courthouse in "Old Town" Lexington was sold for $1,500 and the old jail was sold for $51.00. This left the total expenditure for the new building at $12,831.46. There is a cannonball embedded in the upper left column, a remnant of the Civil War Battle of Lexington I, fought on September 18, 19 and 20, 1861. The Courthouse was listed on the National Register of Historic Places in 1970. It is in the Commercial Community Historic District. References Individually listed contributing properties to historic districts on the National Register in Missouri Buildings and structures in Lafayette County, Missouri County courthouses in Missouri Government buildings completed in 1847 Greek Revival architecture in Missouri Clock towers in Missouri Courthouses on the National Register of Historic Places in Missouri 1847 establishments in Missouri National Register of Historic Places in Lafayette County, Missouri